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c++ source #1
Output
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Intel asm syntax
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Filters
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Debug intrinsics
Compiler
6502-c++ 11.1.0
ARM GCC 10.2.0
ARM GCC 10.3.0
ARM GCC 10.4.0
ARM GCC 10.5.0
ARM GCC 11.1.0
ARM GCC 11.2.0
ARM GCC 11.3.0
ARM GCC 11.4.0
ARM GCC 12.1.0
ARM GCC 12.2.0
ARM GCC 12.3.0
ARM GCC 12.4.0
ARM GCC 13.1.0
ARM GCC 13.2.0
ARM GCC 13.2.0 (unknown-eabi)
ARM GCC 13.3.0
ARM GCC 13.3.0 (unknown-eabi)
ARM GCC 14.1.0
ARM GCC 14.1.0 (unknown-eabi)
ARM GCC 14.2.0
ARM GCC 14.2.0 (unknown-eabi)
ARM GCC 4.5.4
ARM GCC 4.6.4
ARM GCC 5.4
ARM GCC 6.3.0
ARM GCC 6.4.0
ARM GCC 7.3.0
ARM GCC 7.5.0
ARM GCC 8.2.0
ARM GCC 8.5.0
ARM GCC 9.3.0
ARM GCC 9.4.0
ARM GCC 9.5.0
ARM GCC trunk
ARM gcc 10.2.1 (none)
ARM gcc 10.3.1 (2021.07 none)
ARM gcc 10.3.1 (2021.10 none)
ARM gcc 11.2.1 (none)
ARM gcc 5.4.1 (none)
ARM gcc 7.2.1 (none)
ARM gcc 8.2 (WinCE)
ARM gcc 8.3.1 (none)
ARM gcc 9.2.1 (none)
ARM msvc v19.0 (WINE)
ARM msvc v19.10 (WINE)
ARM msvc v19.14 (WINE)
ARM64 Morello gcc 10.1 Alpha 2
ARM64 gcc 10.2
ARM64 gcc 10.3
ARM64 gcc 10.4
ARM64 gcc 10.5.0
ARM64 gcc 11.1
ARM64 gcc 11.2
ARM64 gcc 11.3
ARM64 gcc 11.4.0
ARM64 gcc 12.1
ARM64 gcc 12.2.0
ARM64 gcc 12.3.0
ARM64 gcc 12.4.0
ARM64 gcc 13.1.0
ARM64 gcc 13.2.0
ARM64 gcc 13.3.0
ARM64 gcc 14.1.0
ARM64 gcc 14.2.0
ARM64 gcc 4.9.4
ARM64 gcc 5.4
ARM64 gcc 5.5.0
ARM64 gcc 6.3
ARM64 gcc 6.4
ARM64 gcc 7.3
ARM64 gcc 7.5
ARM64 gcc 8.2
ARM64 gcc 8.5
ARM64 gcc 9.3
ARM64 gcc 9.4
ARM64 gcc 9.5
ARM64 gcc trunk
ARM64 msvc v19.14 (WINE)
AVR gcc 10.3.0
AVR gcc 11.1.0
AVR gcc 12.1.0
AVR gcc 12.2.0
AVR gcc 12.3.0
AVR gcc 12.4.0
AVR gcc 13.1.0
AVR gcc 13.2.0
AVR gcc 13.3.0
AVR gcc 14.1.0
AVR gcc 14.2.0
AVR gcc 4.5.4
AVR gcc 4.6.4
AVR gcc 5.4.0
AVR gcc 9.2.0
AVR gcc 9.3.0
Arduino Mega (1.8.9)
Arduino Uno (1.8.9)
BPF clang (trunk)
BPF clang 13.0.0
BPF clang 14.0.0
BPF clang 15.0.0
BPF clang 16.0.0
BPF clang 17.0.1
BPF clang 18.1.0
BPF gcc 13.1.0
BPF gcc 13.2.0
BPF gcc 13.3.0
BPF gcc trunk
EDG (experimental reflection)
EDG 6.5
EDG 6.5 (GNU mode gcc 13)
EDG 6.6
EDG 6.6 (GNU mode gcc 13)
FRC 2019
FRC 2020
FRC 2023
KVX ACB 4.1.0 (GCC 7.5.0)
KVX ACB 4.1.0-cd1 (GCC 7.5.0)
KVX ACB 4.10.0 (GCC 10.3.1)
KVX ACB 4.11.1 (GCC 10.3.1)
KVX ACB 4.12.0 (GCC 11.3.0)
KVX ACB 4.2.0 (GCC 7.5.0)
KVX ACB 4.3.0 (GCC 7.5.0)
KVX ACB 4.4.0 (GCC 7.5.0)
KVX ACB 4.6.0 (GCC 9.4.1)
KVX ACB 4.8.0 (GCC 9.4.1)
KVX ACB 4.9.0 (GCC 9.4.1)
KVX ACB 5.0.0 (GCC 12.2.1)
LoongArch64 clang (trunk)
LoongArch64 clang 17.0.1
LoongArch64 clang 18.1.0
M68K gcc 13.1.0
M68K gcc 13.2.0
M68K gcc 13.3.0
M68K gcc 14.1.0
M68K gcc 14.2.0
M68k clang (trunk)
MRISC32 gcc (trunk)
MSP430 gcc 4.5.3
MSP430 gcc 5.3.0
MSP430 gcc 6.2.1
MinGW clang 14.0.3
MinGW clang 14.0.6
MinGW clang 15.0.7
MinGW clang 16.0.0
MinGW clang 16.0.2
MinGW gcc 11.3.0
MinGW gcc 12.1.0
MinGW gcc 12.2.0
MinGW gcc 13.1.0
RISC-V (32-bits) gcc (trunk)
RISC-V (32-bits) gcc 10.2.0
RISC-V (32-bits) gcc 10.3.0
RISC-V (32-bits) gcc 11.2.0
RISC-V (32-bits) gcc 11.3.0
RISC-V (32-bits) gcc 11.4.0
RISC-V (32-bits) gcc 12.1.0
RISC-V (32-bits) gcc 12.2.0
RISC-V (32-bits) gcc 12.3.0
RISC-V (32-bits) gcc 12.4.0
RISC-V (32-bits) gcc 13.1.0
RISC-V (32-bits) gcc 13.2.0
RISC-V (32-bits) gcc 13.3.0
RISC-V (32-bits) gcc 14.1.0
RISC-V (32-bits) gcc 14.2.0
RISC-V (32-bits) gcc 8.2.0
RISC-V (32-bits) gcc 8.5.0
RISC-V (32-bits) gcc 9.4.0
RISC-V (64-bits) gcc (trunk)
RISC-V (64-bits) gcc 10.2.0
RISC-V (64-bits) gcc 10.3.0
RISC-V (64-bits) gcc 11.2.0
RISC-V (64-bits) gcc 11.3.0
RISC-V (64-bits) gcc 11.4.0
RISC-V (64-bits) gcc 12.1.0
RISC-V (64-bits) gcc 12.2.0
RISC-V (64-bits) gcc 12.3.0
RISC-V (64-bits) gcc 12.4.0
RISC-V (64-bits) gcc 13.1.0
RISC-V (64-bits) gcc 13.2.0
RISC-V (64-bits) gcc 13.3.0
RISC-V (64-bits) gcc 14.1.0
RISC-V (64-bits) gcc 14.2.0
RISC-V (64-bits) gcc 8.2.0
RISC-V (64-bits) gcc 8.5.0
RISC-V (64-bits) gcc 9.4.0
RISC-V rv32gc clang (trunk)
RISC-V rv32gc clang 10.0.0
RISC-V rv32gc clang 10.0.1
RISC-V rv32gc clang 11.0.0
RISC-V rv32gc clang 11.0.1
RISC-V rv32gc clang 12.0.0
RISC-V rv32gc clang 12.0.1
RISC-V rv32gc clang 13.0.0
RISC-V rv32gc clang 13.0.1
RISC-V rv32gc clang 14.0.0
RISC-V rv32gc clang 15.0.0
RISC-V rv32gc clang 16.0.0
RISC-V rv32gc clang 17.0.1
RISC-V rv32gc clang 18.1.0
RISC-V rv32gc clang 9.0.0
RISC-V rv32gc clang 9.0.1
RISC-V rv64gc clang (trunk)
RISC-V rv64gc clang 10.0.0
RISC-V rv64gc clang 10.0.1
RISC-V rv64gc clang 11.0.0
RISC-V rv64gc clang 11.0.1
RISC-V rv64gc clang 12.0.0
RISC-V rv64gc clang 12.0.1
RISC-V rv64gc clang 13.0.0
RISC-V rv64gc clang 13.0.1
RISC-V rv64gc clang 14.0.0
RISC-V rv64gc clang 15.0.0
RISC-V rv64gc clang 16.0.0
RISC-V rv64gc clang 17.0.1
RISC-V rv64gc clang 18.1.0
RISC-V rv64gc clang 9.0.0
RISC-V rv64gc clang 9.0.1
Raspbian Buster
Raspbian Stretch
SPARC LEON gcc 12.2.0
SPARC LEON gcc 12.3.0
SPARC LEON gcc 12.4.0
SPARC LEON gcc 13.1.0
SPARC LEON gcc 13.2.0
SPARC LEON gcc 13.3.0
SPARC LEON gcc 14.1.0
SPARC LEON gcc 14.2.0
SPARC gcc 12.2.0
SPARC gcc 12.3.0
SPARC gcc 12.4.0
SPARC gcc 13.1.0
SPARC gcc 13.2.0
SPARC gcc 13.3.0
SPARC gcc 14.1.0
SPARC gcc 14.2.0
SPARC64 gcc 12.2.0
SPARC64 gcc 12.3.0
SPARC64 gcc 12.4.0
SPARC64 gcc 13.1.0
SPARC64 gcc 13.2.0
SPARC64 gcc 13.3.0
SPARC64 gcc 14.1.0
SPARC64 gcc 14.2.0
TI C6x gcc 12.2.0
TI C6x gcc 12.3.0
TI C6x gcc 12.4.0
TI C6x gcc 13.1.0
TI C6x gcc 13.2.0
TI C6x gcc 13.3.0
TI C6x gcc 14.1.0
TI C6x gcc 14.2.0
TI CL430 21.6.1
VAX gcc NetBSDELF 10.4.0
VAX gcc NetBSDELF 10.5.0 (Nov 15 03:50:22 2023)
WebAssembly clang (trunk)
Xtensa ESP32 gcc 11.2.0 (2022r1)
Xtensa ESP32 gcc 12.2.0 (20230208)
Xtensa ESP32 gcc 8.2.0 (2019r2)
Xtensa ESP32 gcc 8.2.0 (2020r1)
Xtensa ESP32 gcc 8.2.0 (2020r2)
Xtensa ESP32 gcc 8.4.0 (2020r3)
Xtensa ESP32 gcc 8.4.0 (2021r1)
Xtensa ESP32 gcc 8.4.0 (2021r2)
Xtensa ESP32-S2 gcc 11.2.0 (2022r1)
Xtensa ESP32-S2 gcc 12.2.0 (20230208)
Xtensa ESP32-S2 gcc 8.2.0 (2019r2)
Xtensa ESP32-S2 gcc 8.2.0 (2020r1)
Xtensa ESP32-S2 gcc 8.2.0 (2020r2)
Xtensa ESP32-S2 gcc 8.4.0 (2020r3)
Xtensa ESP32-S2 gcc 8.4.0 (2021r1)
Xtensa ESP32-S2 gcc 8.4.0 (2021r2)
Xtensa ESP32-S3 gcc 11.2.0 (2022r1)
Xtensa ESP32-S3 gcc 12.2.0 (20230208)
Xtensa ESP32-S3 gcc 8.4.0 (2020r3)
Xtensa ESP32-S3 gcc 8.4.0 (2021r1)
Xtensa ESP32-S3 gcc 8.4.0 (2021r2)
arm64 msvc v19.20 VS16.0
arm64 msvc v19.21 VS16.1
arm64 msvc v19.22 VS16.2
arm64 msvc v19.23 VS16.3
arm64 msvc v19.24 VS16.4
arm64 msvc v19.25 VS16.5
arm64 msvc v19.27 VS16.7
arm64 msvc v19.28 VS16.8
arm64 msvc v19.28 VS16.9
arm64 msvc v19.29 VS16.10
arm64 msvc v19.29 VS16.11
arm64 msvc v19.30 VS17.0
arm64 msvc v19.31 VS17.1
arm64 msvc v19.32 VS17.2
arm64 msvc v19.33 VS17.3
arm64 msvc v19.34 VS17.4
arm64 msvc v19.35 VS17.5
arm64 msvc v19.36 VS17.6
arm64 msvc v19.37 VS17.7
arm64 msvc v19.38 VS17.8
arm64 msvc v19.39 VS17.9
arm64 msvc v19.40 VS17.10
arm64 msvc v19.latest
armv7-a clang (trunk)
armv7-a clang 10.0.0
armv7-a clang 10.0.1
armv7-a clang 11.0.0
armv7-a clang 11.0.1
armv7-a clang 12.0.0
armv7-a clang 12.0.1
armv7-a clang 13.0.0
armv7-a clang 13.0.1
armv7-a clang 14.0.0
armv7-a clang 15.0.0
armv7-a clang 16.0.0
armv7-a clang 17.0.1
armv7-a clang 18.1.0
armv7-a clang 9.0.0
armv7-a clang 9.0.1
armv8-a clang (all architectural features, trunk)
armv8-a clang (trunk)
armv8-a clang 10.0.0
armv8-a clang 10.0.1
armv8-a clang 11.0.0
armv8-a clang 11.0.1
armv8-a clang 12.0.0
armv8-a clang 13.0.0
armv8-a clang 14.0.0
armv8-a clang 15.0.0
armv8-a clang 16.0.0
armv8-a clang 17.0.1
armv8-a clang 18.1.0
armv8-a clang 9.0.0
armv8-a clang 9.0.1
ellcc 0.1.33
ellcc 0.1.34
ellcc 2017-07-16
hexagon-clang 16.0.5
llvm-mos atari2600-3e
llvm-mos atari2600-4k
llvm-mos atari2600-common
llvm-mos atari5200-supercart
llvm-mos atari8-cart-megacart
llvm-mos atari8-cart-std
llvm-mos atari8-cart-xegs
llvm-mos atari8-common
llvm-mos atari8-dos
llvm-mos c128
llvm-mos c64
llvm-mos commodore
llvm-mos cpm65
llvm-mos cx16
llvm-mos dodo
llvm-mos eater
llvm-mos mega65
llvm-mos nes
llvm-mos nes-action53
llvm-mos nes-cnrom
llvm-mos nes-gtrom
llvm-mos nes-mmc1
llvm-mos nes-mmc3
llvm-mos nes-nrom
llvm-mos nes-unrom
llvm-mos nes-unrom-512
llvm-mos osi-c1p
llvm-mos pce
llvm-mos pce-cd
llvm-mos pce-common
llvm-mos pet
llvm-mos rp6502
llvm-mos rpc8e
llvm-mos supervision
llvm-mos vic20
loongarch64 gcc 12.2.0
loongarch64 gcc 12.3.0
loongarch64 gcc 12.4.0
loongarch64 gcc 13.1.0
loongarch64 gcc 13.2.0
loongarch64 gcc 13.3.0
loongarch64 gcc 14.1.0
loongarch64 gcc 14.2.0
mips clang 13.0.0
mips clang 14.0.0
mips clang 15.0.0
mips clang 16.0.0
mips clang 17.0.1
mips clang 18.1.0
mips gcc 11.2.0
mips gcc 12.1.0
mips gcc 12.2.0
mips gcc 12.3.0
mips gcc 12.4.0
mips gcc 13.1.0
mips gcc 13.2.0
mips gcc 13.3.0
mips gcc 14.1.0
mips gcc 14.2.0
mips gcc 4.9.4
mips gcc 5.4
mips gcc 5.5.0
mips gcc 9.3.0 (codescape)
mips gcc 9.5.0
mips64 (el) gcc 12.1.0
mips64 (el) gcc 12.2.0
mips64 (el) gcc 12.3.0
mips64 (el) gcc 12.4.0
mips64 (el) gcc 13.1.0
mips64 (el) gcc 13.2.0
mips64 (el) gcc 13.3.0
mips64 (el) gcc 14.1.0
mips64 (el) gcc 14.2.0
mips64 (el) gcc 4.9.4
mips64 (el) gcc 5.4.0
mips64 (el) gcc 5.5.0
mips64 (el) gcc 9.5.0
mips64 clang 13.0.0
mips64 clang 14.0.0
mips64 clang 15.0.0
mips64 clang 16.0.0
mips64 clang 17.0.1
mips64 clang 18.1.0
mips64 gcc 11.2.0
mips64 gcc 12.1.0
mips64 gcc 12.2.0
mips64 gcc 12.3.0
mips64 gcc 12.4.0
mips64 gcc 13.1.0
mips64 gcc 13.2.0
mips64 gcc 13.3.0
mips64 gcc 14.1.0
mips64 gcc 14.2.0
mips64 gcc 4.9.4
mips64 gcc 5.4.0
mips64 gcc 5.5.0
mips64 gcc 9.5.0
mips64el clang 13.0.0
mips64el clang 14.0.0
mips64el clang 15.0.0
mips64el clang 16.0.0
mips64el clang 17.0.1
mips64el clang 18.1.0
mipsel clang 13.0.0
mipsel clang 14.0.0
mipsel clang 15.0.0
mipsel clang 16.0.0
mipsel clang 17.0.1
mipsel clang 18.1.0
mipsel gcc 12.1.0
mipsel gcc 12.2.0
mipsel gcc 12.3.0
mipsel gcc 12.4.0
mipsel gcc 13.1.0
mipsel gcc 13.2.0
mipsel gcc 13.3.0
mipsel gcc 14.1.0
mipsel gcc 14.2.0
mipsel gcc 4.9.4
mipsel gcc 5.4.0
mipsel gcc 5.5.0
mipsel gcc 9.5.0
nanoMIPS gcc 6.3.0 (mtk)
power gcc 11.2.0
power gcc 12.1.0
power gcc 12.2.0
power gcc 12.3.0
power gcc 12.4.0
power gcc 13.1.0
power gcc 13.2.0
power gcc 13.3.0
power gcc 14.1.0
power gcc 14.2.0
power gcc 4.8.5
power64 AT12.0 (gcc8)
power64 AT13.0 (gcc9)
power64 gcc 11.2.0
power64 gcc 12.1.0
power64 gcc 12.2.0
power64 gcc 12.3.0
power64 gcc 12.4.0
power64 gcc 13.1.0
power64 gcc 13.2.0
power64 gcc 13.3.0
power64 gcc 14.1.0
power64 gcc 14.2.0
power64 gcc trunk
power64le AT12.0 (gcc8)
power64le AT13.0 (gcc9)
power64le clang (trunk)
power64le gcc 11.2.0
power64le gcc 12.1.0
power64le gcc 12.2.0
power64le gcc 12.3.0
power64le gcc 12.4.0
power64le gcc 13.1.0
power64le gcc 13.2.0
power64le gcc 13.3.0
power64le gcc 14.1.0
power64le gcc 14.2.0
power64le gcc 6.3.0
power64le gcc trunk
powerpc64 clang (trunk)
s390x gcc 11.2.0
s390x gcc 12.1.0
s390x gcc 12.2.0
s390x gcc 12.3.0
s390x gcc 12.4.0
s390x gcc 13.1.0
s390x gcc 13.2.0
s390x gcc 13.3.0
s390x gcc 14.1.0
s390x gcc 14.2.0
sh gcc 12.2.0
sh gcc 12.3.0
sh gcc 12.4.0
sh gcc 13.1.0
sh gcc 13.2.0
sh gcc 13.3.0
sh gcc 14.1.0
sh gcc 14.2.0
sh gcc 4.9.4
sh gcc 9.5.0
vast (trunk)
x64 msvc v19.0 (WINE)
x64 msvc v19.10 (WINE)
x64 msvc v19.14 (WINE)
x64 msvc v19.20 VS16.0
x64 msvc v19.21 VS16.1
x64 msvc v19.22 VS16.2
x64 msvc v19.23 VS16.3
x64 msvc v19.24 VS16.4
x64 msvc v19.25 VS16.5
x64 msvc v19.27 VS16.7
x64 msvc v19.28 VS16.8
x64 msvc v19.28 VS16.9
x64 msvc v19.29 VS16.10
x64 msvc v19.29 VS16.11
x64 msvc v19.30 VS17.0
x64 msvc v19.31 VS17.1
x64 msvc v19.32 VS17.2
x64 msvc v19.33 VS17.3
x64 msvc v19.34 VS17.4
x64 msvc v19.35 VS17.5
x64 msvc v19.36 VS17.6
x64 msvc v19.37 VS17.7
x64 msvc v19.38 VS17.8
x64 msvc v19.39 VS17.9
x64 msvc v19.40 VS17.10
x64 msvc v19.latest
x86 djgpp 4.9.4
x86 djgpp 5.5.0
x86 djgpp 6.4.0
x86 djgpp 7.2.0
x86 msvc v19.0 (WINE)
x86 msvc v19.10 (WINE)
x86 msvc v19.14 (WINE)
x86 msvc v19.20 VS16.0
x86 msvc v19.21 VS16.1
x86 msvc v19.22 VS16.2
x86 msvc v19.23 VS16.3
x86 msvc v19.24 VS16.4
x86 msvc v19.25 VS16.5
x86 msvc v19.27 VS16.7
x86 msvc v19.28 VS16.8
x86 msvc v19.28 VS16.9
x86 msvc v19.29 VS16.10
x86 msvc v19.29 VS16.11
x86 msvc v19.30 VS17.0
x86 msvc v19.31 VS17.1
x86 msvc v19.32 VS17.2
x86 msvc v19.33 VS17.3
x86 msvc v19.34 VS17.4
x86 msvc v19.35 VS17.5
x86 msvc v19.36 VS17.6
x86 msvc v19.37 VS17.7
x86 msvc v19.38 VS17.8
x86 msvc v19.39 VS17.9
x86 msvc v19.40 VS17.10
x86 msvc v19.latest
x86 nvc++ 22.11
x86 nvc++ 22.7
x86 nvc++ 22.9
x86 nvc++ 23.1
x86 nvc++ 23.11
x86 nvc++ 23.3
x86 nvc++ 23.5
x86 nvc++ 23.7
x86 nvc++ 23.9
x86 nvc++ 24.1
x86 nvc++ 24.3
x86 nvc++ 24.5
x86 nvc++ 24.7
x86-64 Zapcc 190308
x86-64 clang (EricWF contracts)
x86-64 clang (amd-staging)
x86-64 clang (assertions trunk)
x86-64 clang (clangir)
x86-64 clang (dascandy contracts)
x86-64 clang (experimental -Wlifetime)
x86-64 clang (experimental P1061)
x86-64 clang (experimental P1144)
x86-64 clang (experimental P1221)
x86-64 clang (experimental P2996)
x86-64 clang (experimental P3068)
x86-64 clang (experimental P3309)
x86-64 clang (experimental P3367)
x86-64 clang (experimental P3372)
x86-64 clang (experimental metaprogramming - P2632)
x86-64 clang (experimental pattern matching)
x86-64 clang (old concepts branch)
x86-64 clang (p1974)
x86-64 clang (reflection)
x86-64 clang (resugar)
x86-64 clang (thephd.dev)
x86-64 clang (trunk)
x86-64 clang (variadic friends - P2893)
x86-64 clang (widberg)
x86-64 clang 10.0.0
x86-64 clang 10.0.0 (assertions)
x86-64 clang 10.0.1
x86-64 clang 11.0.0
x86-64 clang 11.0.0 (assertions)
x86-64 clang 11.0.1
x86-64 clang 12.0.0
x86-64 clang 12.0.0 (assertions)
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zig c++ 0.10.0
zig c++ 0.11.0
zig c++ 0.12.0
zig c++ 0.12.1
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// // span for C++98 and later. // Based on http://wg21.link/p0122r7 // For more information see https://github.com/martinmoene/span-lite // // Copyright 2018-2019 Martin Moene // // Distributed under the Boost Software License, Version 1.0. // (See accompanying file LICENSE.txt or copy at http://www.boost.org/LICENSE_1_0.txt) #ifndef NONSTD_SPAN_HPP_INCLUDED #define NONSTD_SPAN_HPP_INCLUDED #define span_lite_MAJOR 0 #define span_lite_MINOR 4 #define span_lite_PATCH 0 #define span_lite_VERSION span_STRINGIFY(span_lite_MAJOR) "." span_STRINGIFY(span_lite_MINOR) "." span_STRINGIFY(span_lite_PATCH) #define span_STRINGIFY( x ) span_STRINGIFY_( x ) #define span_STRINGIFY_( x ) #x // span configuration: #define span_SPAN_DEFAULT 0 #define span_SPAN_NONSTD 1 #define span_SPAN_STD 2 #ifndef span_CONFIG_SELECT_SPAN # define span_CONFIG_SELECT_SPAN ( span_HAVE_STD_SPAN ? span_SPAN_STD : span_SPAN_NONSTD ) #endif #ifndef span_CONFIG_INDEX_TYPE # define span_CONFIG_INDEX_TYPE std::ptrdiff_t #endif // span configuration (features): #ifndef span_FEATURE_WITH_CONTAINER_TO_STD # define span_FEATURE_WITH_CONTAINER_TO_STD 0 #endif #ifndef span_FEATURE_CONSTRUCTION_FROM_STDARRAY_ELEMENT_TYPE # define span_FEATURE_CONSTRUCTION_FROM_STDARRAY_ELEMENT_TYPE 0 #endif #ifndef span_FEATURE_MEMBER_AT # define span_FEATURE_MEMBER_AT 0 #endif #ifndef span_FEATURE_MEMBER_BACK_FRONT # define span_FEATURE_MEMBER_BACK_FRONT 0 #endif #ifndef span_FEATURE_MEMBER_CALL_OPERATOR # define span_FEATURE_MEMBER_CALL_OPERATOR 0 #endif #ifndef span_FEATURE_MEMBER_SWAP # define span_FEATURE_MEMBER_SWAP 0 #endif #ifndef span_FEATURE_NON_MEMBER_FIRST_LAST_SUB # define span_FEATURE_NON_MEMBER_FIRST_LAST_SUB 0 #endif #ifndef span_FEATURE_SAME # define span_FEATURE_SAME 0 #endif #ifndef span_FEATURE_MAKE_SPAN_TO_STD # define span_FEATURE_MAKE_SPAN_TO_STD 0 #endif #ifndef span_FEATURE_BYTE_SPAN # define span_FEATURE_BYTE_SPAN 0 #endif // Control presence of exception handling (try and auto discover): #ifndef span_CONFIG_NO_EXCEPTIONS # if defined(__cpp_exceptions) || defined(__EXCEPTIONS) || defined(_CPPUNWIND) # define span_CONFIG_NO_EXCEPTIONS 0 # else # define span_CONFIG_NO_EXCEPTIONS 1 # undef span_CONFIG_CONTRACT_VIOLATION_THROWS # undef span_CONFIG_CONTRACT_VIOLATION_TERMINATES # define span_CONFIG_CONTRACT_VIOLATION_THROWS 0 # define span_CONFIG_CONTRACT_VIOLATION_TERMINATES 1 # endif #endif // Control pre- and postcondition violation behaviour: #if defined( span_CONFIG_CONTRACT_LEVEL_ON ) # define span_CONFIG_CONTRACT_LEVEL_MASK 0x11 #elif defined( span_CONFIG_CONTRACT_LEVEL_OFF ) # define span_CONFIG_CONTRACT_LEVEL_MASK 0x00 #elif defined( span_CONFIG_CONTRACT_LEVEL_EXPECTS_ONLY ) # define span_CONFIG_CONTRACT_LEVEL_MASK 0x01 #elif defined( span_CONFIG_CONTRACT_LEVEL_ENSURES_ONLY ) # define span_CONFIG_CONTRACT_LEVEL_MASK 0x10 #else # define span_CONFIG_CONTRACT_LEVEL_MASK 0x11 #endif #if defined( span_CONFIG_CONTRACT_VIOLATION_THROWS ) # define span_CONFIG_CONTRACT_VIOLATION_THROWS_V span_CONFIG_CONTRACT_VIOLATION_THROWS #else # define span_CONFIG_CONTRACT_VIOLATION_THROWS_V 0 #endif #if defined( span_CONFIG_CONTRACT_VIOLATION_THROWS ) && span_CONFIG_CONTRACT_VIOLATION_THROWS && \ defined( span_CONFIG_CONTRACT_VIOLATION_TERMINATES ) && span_CONFIG_CONTRACT_VIOLATION_TERMINATES # error Please define none or one of span_CONFIG_CONTRACT_VIOLATION_THROWS and span_CONFIG_CONTRACT_VIOLATION_TERMINATES to 1, but not both. #endif // C++ language version detection (C++20 is speculative): // Note: VC14.0/1900 (VS2015) lacks too much from C++14. #ifndef span_CPLUSPLUS # if defined(_MSVC_LANG ) && !defined(__clang__) # define span_CPLUSPLUS (_MSC_VER == 1900 ? 201103L : _MSVC_LANG ) # else # define span_CPLUSPLUS __cplusplus # endif #endif #define span_CPP98_OR_GREATER ( span_CPLUSPLUS >= 199711L ) #define span_CPP11_OR_GREATER ( span_CPLUSPLUS >= 201103L ) #define span_CPP14_OR_GREATER ( span_CPLUSPLUS >= 201402L ) #define span_CPP17_OR_GREATER ( span_CPLUSPLUS >= 201703L ) #define span_CPP20_OR_GREATER ( span_CPLUSPLUS >= 202000L ) // C++ language version (represent 98 as 3): #define span_CPLUSPLUS_V ( span_CPLUSPLUS / 100 - (span_CPLUSPLUS > 200000 ? 2000 : 1994) ) #define span_IN_STD( v ) ( (v) == 98 || (v) >= span_CPLUSPLUS_V ) #define span_CONFIG( feature ) ( span_CONFIG_##feature ) #define span_FEATURE( feature ) ( span_FEATURE_##feature ) #define span_FEATURE_TO_STD( feature ) ( span_IN_STD( span_FEATURE( feature##_TO_STD ) ) ) // Use C++20 std::span if available and requested: #if span_CPP20_OR_GREATER && defined(__has_include ) # if __has_include( <span> ) # define span_HAVE_STD_SPAN 1 # else # define span_HAVE_STD_SPAN 0 # endif #else # define span_HAVE_STD_SPAN 0 #endif #define span_USES_STD_SPAN ( (span_CONFIG_SELECT_SPAN == span_SPAN_STD) || ((span_CONFIG_SELECT_SPAN == span_SPAN_DEFAULT) && span_HAVE_STD_SPAN) ) // // Use C++20 std::span: // #if span_USES_STD_SPAN #include <span> namespace nonstd { using std::span; using std::operator==; using std::operator!=; using std::operator<; using std::operator<=; using std::operator>; using std::operator>=; } // namespace nonstd #else // span_USES_STD_SPAN #include <algorithm> // Compiler versions: // // MSVC++ 6.0 _MSC_VER == 1200 (Visual Studio 6.0) // MSVC++ 7.0 _MSC_VER == 1300 (Visual Studio .NET 2002) // MSVC++ 7.1 _MSC_VER == 1310 (Visual Studio .NET 2003) // MSVC++ 8.0 _MSC_VER == 1400 (Visual Studio 2005) // MSVC++ 9.0 _MSC_VER == 1500 (Visual Studio 2008) // MSVC++ 10.0 _MSC_VER == 1600 (Visual Studio 2010) // MSVC++ 11.0 _MSC_VER == 1700 (Visual Studio 2012) // MSVC++ 12.0 _MSC_VER == 1800 (Visual Studio 2013) // MSVC++ 14.0 _MSC_VER == 1900 (Visual Studio 2015) // MSVC++ 14.1 _MSC_VER >= 1910 (Visual Studio 2017) #if defined(_MSC_VER ) && !defined(__clang__) # define span_COMPILER_MSVC_VER (_MSC_VER ) # define span_COMPILER_MSVC_VERSION (_MSC_VER / 10 - 10 * ( 5 + (_MSC_VER < 1900 ) ) ) #else # define span_COMPILER_MSVC_VER 0 # define span_COMPILER_MSVC_VERSION 0 #endif #define span_COMPILER_VERSION( major, minor, patch ) ( 10 * ( 10 * (major) + (minor) ) + (patch) ) #if defined(__clang__) # define span_COMPILER_CLANG_VERSION span_COMPILER_VERSION(__clang_major__, __clang_minor__, __clang_patchlevel__) #else # define span_COMPILER_CLANG_VERSION 0 #endif #if defined(__GNUC__) && !defined(__clang__) # define span_COMPILER_GNUC_VERSION span_COMPILER_VERSION(__GNUC__, __GNUC_MINOR__, __GNUC_PATCHLEVEL__) #else # define span_COMPILER_GNUC_VERSION 0 #endif // half-open range [lo..hi): #define span_BETWEEN( v, lo, hi ) ( (lo) <= (v) && (v) < (hi) ) // Compiler warning suppression: #if defined(__clang__) # pragma clang diagnostic push # pragma clang diagnostic ignored "-Wundef" # define span_RESTORE_WARNINGS() _Pragma( "clang diagnostic pop" ) #elif defined __GNUC__ # pragma GCC diagnostic push # pragma GCC diagnostic ignored "-Wundef" # define span_RESTORE_WARNINGS() _Pragma( "GCC diagnostic pop" ) #elif span_COMPILER_MSVC_VERSION >= 140 # define span_DISABLE_MSVC_WARNINGS(codes) __pragma(warning(push)) __pragma(warning(disable: codes)) # define span_RESTORE_WARNINGS() __pragma(warning(pop )) // Suppress the following MSVC GSL warnings: // - C26439, gsl::f.6 : special function 'function' can be declared 'noexcept' // - C26440, gsl::f.6 : function 'function' can be declared 'noexcept' // - C26472, gsl::t.1 : don't use a static_cast for arithmetic conversions; // use brace initialization, gsl::narrow_cast or gsl::narrow // - C26473: gsl::t.1 : don't cast between pointer types where the source type and the target type are the same // - C26481: gsl::b.1 : don't use pointer arithmetic. Use span instead // - C26490: gsl::t.1 : don't use reinterpret_cast span_DISABLE_MSVC_WARNINGS( 26439 26440 26472 26473 26481 26490 ) #else # define span_RESTORE_WARNINGS() /*empty*/ #endif // Presence of language and library features: #define span_HAVE( feature ) ( span_HAVE_##feature ) #ifdef _HAS_CPP0X # define span_HAS_CPP0X _HAS_CPP0X #else # define span_HAS_CPP0X 0 #endif #define span_CPP11_80 (span_CPP11_OR_GREATER || span_COMPILER_MSVC_VER >= 1400) #define span_CPP11_90 (span_CPP11_OR_GREATER || span_COMPILER_MSVC_VER >= 1500) #define span_CPP11_100 (span_CPP11_OR_GREATER || span_COMPILER_MSVC_VER >= 1600) #define span_CPP11_110 (span_CPP11_OR_GREATER || span_COMPILER_MSVC_VER >= 1700) #define span_CPP11_120 (span_CPP11_OR_GREATER || span_COMPILER_MSVC_VER >= 1800) #define span_CPP11_140 (span_CPP11_OR_GREATER || span_COMPILER_MSVC_VER >= 1900) #define span_CPP14_000 (span_CPP14_OR_GREATER) #define span_CPP14_120 (span_CPP14_OR_GREATER || span_COMPILER_MSVC_VER >= 1800) #define span_CPP14_140 (span_CPP14_OR_GREATER || span_COMPILER_MSVC_VER >= 1900) #define span_CPP17_000 (span_CPP17_OR_GREATER) // Presence of C++11 language features: #define span_HAVE_ALIAS_TEMPLATE span_CPP11_140 #define span_HAVE_AUTO span_CPP11_100 #define span_HAVE_CONSTEXPR_11 span_CPP11_140 #define span_HAVE_DEFAULT_FUNCTION_TEMPLATE_ARG span_CPP11_120 #define span_HAVE_EXPLICIT_CONVERSION span_CPP11_140 #define span_HAVE_INITIALIZER_LIST span_CPP11_120 #define span_HAVE_IS_DEFAULT span_CPP11_140 #define span_HAVE_IS_DELETE span_CPP11_140 #define span_HAVE_NOEXCEPT span_CPP11_140 #define span_HAVE_NULLPTR span_CPP11_100 #define span_HAVE_STATIC_ASSERT span_CPP11_100 // Presence of C++14 language features: #define span_HAVE_CONSTEXPR_14 span_CPP14_000 // Presence of C++17 language features: #define span_HAVE_DEPRECATED span_CPP17_000 #define span_HAVE_NODISCARD span_CPP17_000 #define span_HAVE_NORETURN span_CPP17_000 // MSVC: template parameter deduction guides since Visual Studio 2017 v15.7 #define span_HAVE_DEDUCTION_GUIDES (span_CPP17_OR_GREATER && ! span_BETWEEN( span_COMPILER_MSVC_VERSION, 1, 999 )) // Presence of C++ library features: #define span_HAVE_ADDRESSOF span_CPP17_000 #define span_HAVE_ARRAY span_CPP11_110 #define span_HAVE_BYTE span_CPP17_000 #define span_HAVE_CONDITIONAL span_CPP11_120 #define span_HAVE_CONTAINER_DATA_METHOD (span_CPP11_140 || ( span_COMPILER_MSVC_VERSION >= 90 && span_HAS_CPP0X )) #define span_HAVE_DATA span_CPP17_000 #define span_HAVE_LONGLONG span_CPP11_80 #define span_HAVE_REMOVE_CONST span_CPP11_110 #define span_HAVE_SNPRINTF span_CPP11_140 #define span_HAVE_TYPE_TRAITS span_CPP11_90 // Presence of byte-lite: #ifdef NONSTD_BYTE_LITE_HPP # define span_HAVE_NONSTD_BYTE 1 #else # define span_HAVE_NONSTD_BYTE 0 #endif // C++ feature usage: #if span_HAVE_ADDRESSOF # define span_ADDRESSOF(x) std::addressof(x) #else # define span_ADDRESSOF(x) (&x) #endif #if span_HAVE_CONSTEXPR_11 # define span_constexpr constexpr #else # define span_constexpr /*span_constexpr*/ #endif #if span_HAVE_CONSTEXPR_14 # define span_constexpr14 constexpr #else # define span_constexpr14 /*span_constexpr*/ #endif #if span_HAVE_EXPLICIT_CONVERSION # define span_explicit explicit #else # define span_explicit /*explicit*/ #endif #if span_HAVE_IS_DELETE # define span_is_delete = delete #else # define span_is_delete #endif #if span_HAVE_IS_DELETE # define span_is_delete_access public #else # define span_is_delete_access private #endif #if span_HAVE_NOEXCEPT && ! span_CONFIG_CONTRACT_VIOLATION_THROWS_V # define span_noexcept noexcept #else # define span_noexcept /*noexcept*/ #endif #if span_HAVE_NULLPTR # define span_nullptr nullptr #else # define span_nullptr NULL #endif #if span_HAVE_DEPRECATED # define span_deprecated(msg) [[deprecated(msg)]] #else # define span_deprecated(msg) /*[[deprecated]]*/ #endif #if span_HAVE_NODISCARD # define span_nodiscard [[nodiscard]] #else # define span_nodiscard /*[[nodiscard]]*/ #endif #if span_HAVE_NORETURN # define span_noreturn [[noreturn]] #else # define span_noreturn /*[[noreturn]]*/ #endif // Other features: #define span_HAVE_CONSTRAINED_SPAN_CONTAINER_CTOR \ ( span_HAVE_DEFAULT_FUNCTION_TEMPLATE_ARG && span_HAVE_CONTAINER_DATA_METHOD ) // Additional includes: #if span_HAVE( ADDRESSOF ) # include <memory> #endif #if span_HAVE( ARRAY ) # include <array> #endif #if span_HAVE( BYTE ) # include <cstddef> #endif #if span_HAVE( TYPE_TRAITS ) # include <type_traits> #endif #if ! span_HAVE( CONSTRAINED_SPAN_CONTAINER_CTOR ) # include <vector> #endif #if span_FEATURE( MEMBER_AT ) > 1 # include <cstdio> #endif #if span_CONFIG( CONTRACT_VIOLATION_THROWS_V ) # include <stdexcept> #endif // Contract violation #define span_ELIDE_CONTRACT_EXPECTS ( 0 == ( span_CONFIG_CONTRACT_LEVEL_MASK & 0x01 ) ) #define span_ELIDE_CONTRACT_ENSURES ( 0 == ( span_CONFIG_CONTRACT_LEVEL_MASK & 0x10 ) ) #if span_ELIDE_CONTRACT_EXPECTS # define span_constexpr_exp span_constexpr # define span_EXPECTS( cond ) /* Expect elided */ #else # define span_constexpr_exp span_constexpr14 # define span_EXPECTS( cond ) span_CONTRACT_CHECK( "Precondition", cond ) #endif #if span_ELIDE_CONTRACT_ENSURES # define span_constexpr_ens span_constexpr # define span_ENSURES( cond ) /* Ensures elided */ #else # define span_constexpr_ens span_constexpr14 # define span_ENSURES( cond ) span_CONTRACT_CHECK( "Postcondition", cond ) #endif #define span_CONTRACT_CHECK( type, cond ) \ cond ? static_cast< void >( 0 ) \ : nonstd::span_lite::detail::report_contract_violation( span_LOCATION( __FILE__, __LINE__ ) ": " type " violation." ) #ifdef __GNUG__ # define span_LOCATION( file, line ) file ":" span_STRINGIFY( line ) #else # define span_LOCATION( file, line ) file "(" span_STRINGIFY( line ) ")" #endif namespace nonstd { namespace span_lite { // [views.constants], constants typedef span_CONFIG_INDEX_TYPE index_t; typedef std::ptrdiff_t extent_t; span_constexpr const extent_t dynamic_extent = -1; template< class T, extent_t Extent = dynamic_extent > class span; // Tag to select span constructor taking a container (prevent ms-gsl warning C26426): struct with_container_t { span_constexpr with_container_t() span_noexcept {} }; const span_constexpr with_container_t with_container; // Implementation details: namespace detail { #if span_HAVE( BYTE ) using std::byte; #elif span_HAVE( NONSTD_BYTE ) using nonstd::byte; #endif #if span_HAVE( TYPE_TRAITS ) using std::is_same; using std::true_type; using std::false_type; #endif #if span_HAVE( REMOVE_CONST ) using std::remove_cv; using std::remove_const; using std::remove_volatile; #else template< class T > struct remove_const { typedef T type; }; template< class T > struct remove_const< T const > { typedef T type; }; template< class T > struct remove_volatile { typedef T type; }; template< class T > struct remove_volatile< T volatile > { typedef T type; }; template< class T > struct remove_cv { typedef typename detail::remove_volatile< typename detail::remove_const< T >::type >::type type; }; #endif // span_HAVE( REMOVE_CONST ) #if ! span_HAVE( TYPE_TRAITS ) struct true_type { enum { value = true }; }; struct false_type{ enum { value = false }; }; template< class T, class U > struct is_same : false_type{}; template< class T > struct is_same<T, T> : true_type{}; #endif #if span_HAVE( TYPE_TRAITS ) template< class Q > struct is_span_oracle : std::false_type{}; template< class T, std::ptrdiff_t Extent > struct is_span_oracle< span<T, Extent> > : std::true_type{}; template< class Q > struct is_span : is_span_oracle< typename std::remove_cv<Q>::type >{}; template< class Q > struct is_std_array_oracle : std::false_type{}; #if span_HAVE( ARRAY ) template< class T, std::size_t Extent > struct is_std_array_oracle< std::array<T, Extent> > : std::true_type{}; #endif template< class Q > struct is_std_array : is_std_array_oracle< typename std::remove_cv<Q>::type >{}; template< class Q > struct is_array : std::false_type {}; template< class T > struct is_array<T[]> : std::true_type {}; template< class T, std::size_t N > struct is_array<T[N]> : std::true_type {}; #endif // span_HAVE( TYPE_TRAITS ) #if ! span_CONFIG( NO_EXCEPTIONS ) #if span_FEATURE( MEMBER_AT ) > 1 // format index and size: #if defined(__clang__) # pragma clang diagnostic ignored "-Wlong-long" #elif defined __GNUC__ # pragma GCC diagnostic ignored "-Wformat=ll" # pragma GCC diagnostic ignored "-Wlong-long" #endif inline void throw_out_of_range( index_t idx, index_t size ) { const char fmt[] = "span::at(): index '%lli' is out of range [0..%lli)"; char buffer[ 2 * 20 + sizeof fmt ]; sprintf( buffer, fmt, static_cast<long long>(idx), static_cast<long long>(size) ); throw std::out_of_range( buffer ); } #else // MEMBER_AT inline void throw_out_of_range( index_t /*idx*/, index_t /*size*/ ) { throw std::out_of_range( "span::at(): index outside span" ); } #endif // MEMBER_AT #endif // NO_EXCEPTIONS #if span_CONFIG( CONTRACT_VIOLATION_THROWS_V ) struct contract_violation : std::logic_error { explicit contract_violation( char const * const message ) : std::logic_error( message ) {} }; inline void report_contract_violation( char const * msg ) { throw contract_violation( msg ); } #else // span_CONFIG( CONTRACT_VIOLATION_THROWS_V ) span_noreturn inline void report_contract_violation( char const * /*msg*/ ) span_noexcept { std::terminate(); } #endif // span_CONFIG( CONTRACT_VIOLATION_THROWS_V ) } // namespace detail // Prevent signed-unsigned mismatch: #define span_sizeof(T) static_cast<extent_t>( sizeof(T) ) template< class T > inline span_constexpr index_t to_size( T size ) { return static_cast<index_t>( size ); } #if span_HAVE( CONSTRAINED_SPAN_CONTAINER_CTOR ) // Can construct from containers that: template< class Container, class ElementType , class = typename std::enable_if< ! detail::is_span< Container >::value && ! detail::is_array< Container >::value && ! detail::is_std_array< Container >::value && std::is_convertible<typename std::remove_pointer<decltype(std::declval<Container>().data())>::type(*)[], ElementType(*)[] >::value >::type #if span_HAVE( DATA ) // data(cont) and size(cont) well-formed: , class = decltype( std::data( std::declval<Container>() ) ) , class = decltype( std::size( std::declval<Container>() ) ) #endif > struct can_construct_from : detail::true_type{}; #endif // // [views.span] - A view over a contiguous, single-dimension sequence of objects // template< class T, extent_t Extent /*= dynamic_extent*/ > class span { public: // constants and types typedef T element_type; typedef typename detail::remove_cv< T >::type value_type; typedef T & reference; typedef T * pointer; typedef T const * const_pointer; typedef T const & const_reference; typedef index_t index_type; typedef extent_t extent_type; typedef pointer iterator; typedef const_pointer const_iterator; typedef std::ptrdiff_t difference_type; typedef std::reverse_iterator< iterator > reverse_iterator; typedef std::reverse_iterator< const_iterator > const_reverse_iterator; // static constexpr extent_type extent = Extent; enum { extent = Extent }; // 26.7.3.2 Constructors, copy, and assignment [span.cons] #if span_HAVE( DEFAULT_FUNCTION_TEMPLATE_ARG ) template< bool Dependent = false , class = typename std::enable_if< (Dependent || Extent <= 0) >::type > #endif span_constexpr span() span_noexcept : data_( span_nullptr ) , size_( 0 ) { // span_EXPECTS( data() == span_nullptr ); // span_EXPECTS( size() == 0 ); } span_constexpr_exp span( pointer ptr, index_type count ) : data_( ptr ) , size_( count ) { span_EXPECTS( ( ptr == span_nullptr && count == 0 ) || ( ptr != span_nullptr && count >= 0 ) ); } span_constexpr_exp span( pointer firstElem, pointer lastElem ) : data_( firstElem ) , size_( to_size( std::distance( firstElem, lastElem ) ) ) { span_EXPECTS( std::distance( firstElem, lastElem ) >= 0 ); } template< size_t N #if span_HAVE( DEFAULT_FUNCTION_TEMPLATE_ARG ) , class = typename std::enable_if< (Extent == dynamic_extent || Extent == N) && std::is_convertible<value_type(*)[], element_type(*)[] >::value >::type #endif > span_constexpr span( element_type ( &arr )[ N ] ) span_noexcept : data_( span_ADDRESSOF( arr[0] ) ) , size_( N ) {} #if span_HAVE( ARRAY ) template< size_t N # if span_HAVE( DEFAULT_FUNCTION_TEMPLATE_ARG ) , class = typename std::enable_if< (Extent == dynamic_extent || Extent == N) && std::is_convertible<value_type(*)[], element_type(*)[] >::value >::type # endif > # if span_FEATURE( CONSTRUCTION_FROM_STDARRAY_ELEMENT_TYPE ) span_constexpr span( std::array< element_type, N > & arr ) span_noexcept # else span_constexpr span( std::array< value_type, N > & arr ) span_noexcept # endif : data_( span_ADDRESSOF( arr[0] ) ) , size_( to_size( arr.size() ) ) {} template< size_t N # if span_HAVE( DEFAULT_FUNCTION_TEMPLATE_ARG ) , class = typename std::enable_if< (Extent == dynamic_extent || Extent == N) && std::is_convertible<value_type(*)[], element_type(*)[] >::value >::type # endif > span_constexpr span( std::array< value_type, N> const & arr ) span_noexcept : data_( span_ADDRESSOF( arr[0] ) ) , size_( to_size( arr.size() ) ) {} #endif // span_HAVE( ARRAY ) #if span_HAVE( CONSTRAINED_SPAN_CONTAINER_CTOR ) template< class Container , class = typename std::enable_if< can_construct_from< Container, element_type >::value >::type > span_constexpr span( Container & cont ) : data_( cont.data() ) , size_( to_size( cont.size() ) ) {} template< class Container , class = typename std::enable_if< std::is_const< element_type >::value && can_construct_from< Container, element_type >::value >::type > span_constexpr span( Container const & cont ) : data_( cont.data() ) , size_( to_size( cont.size() ) ) {} #endif // span_HAVE( CONSTRAINED_SPAN_CONTAINER_CTOR ) #if span_FEATURE_TO_STD( WITH_CONTAINER ) template< class Container > span_constexpr span( with_container_t, Container & cont ) : data_( cont.size() == 0 ? span_nullptr : span_ADDRESSOF( cont[0] ) ) , size_( to_size( cont.size() ) ) {} template< class Container > span_constexpr span( with_container_t, Container const & cont ) : data_( cont.size() == 0 ? span_nullptr : const_cast<pointer>( span_ADDRESSOF( cont[0] ) ) ) , size_( to_size( cont.size() ) ) {} #endif #if span_HAVE( IS_DEFAULT ) span_constexpr span( span const & other ) span_noexcept = default; ~span() span_noexcept = default; span_constexpr14 span & operator=( span const & other ) span_noexcept = default; #else span_constexpr span( span const & other ) span_noexcept : data_( other.data_ ) , size_( other.size_ ) {} ~span() span_noexcept {} span_constexpr14 span & operator=( span const & other ) span_noexcept { data_ = other.data_; size_ = other.size_; return *this; } #endif template< class OtherElementType, extent_type OtherExtent #if span_HAVE( DEFAULT_FUNCTION_TEMPLATE_ARG ) , class = typename std::enable_if< (Extent == dynamic_extent || Extent == OtherExtent) && std::is_convertible<OtherElementType(*)[], element_type(*)[]>::value >::type #endif > span_constexpr_exp span( span<OtherElementType, OtherExtent> const & other ) span_noexcept : data_( reinterpret_cast<pointer>( other.data() ) ) , size_( other.size() ) { span_EXPECTS( OtherExtent == dynamic_extent || other.size() == to_size(OtherExtent) ); } // 26.7.3.3 Subviews [span.sub] template< extent_type Count > span_constexpr_exp span< element_type, Count > first() const { span_EXPECTS( 0 <= Count && Count <= size() ); return span< element_type, Count >( data(), Count ); } template< extent_type Count > span_constexpr_exp span< element_type, Count > last() const { span_EXPECTS( 0 <= Count && Count <= size() ); return span< element_type, Count >( data() + (size() - Count), Count ); } #if span_HAVE( DEFAULT_FUNCTION_TEMPLATE_ARG ) template< index_type Offset, extent_type Count = dynamic_extent > #else template< index_type Offset, extent_type Count /*= dynamic_extent*/ > #endif span_constexpr_exp span< element_type, Count > subspan() const { span_EXPECTS( ( 0 <= Offset && Offset <= size() ) && ( Count == dynamic_extent || (0 <= Count && Count + Offset <= size()) ) ); return span< element_type, Count >( data() + Offset, Count != dynamic_extent ? Count : (Extent != dynamic_extent ? Extent - Offset : size() - Offset) ); } span_constexpr_exp span< element_type, dynamic_extent > first( index_type count ) const { span_EXPECTS( 0 <= count && count <= size() ); return span< element_type, dynamic_extent >( data(), count ); } span_constexpr_exp span< element_type, dynamic_extent > last( index_type count ) const { span_EXPECTS( 0 <= count && count <= size() ); return span< element_type, dynamic_extent >( data() + ( size() - count ), count ); } span_constexpr_exp span< element_type, dynamic_extent > subspan( index_type offset, index_type count = static_cast<index_type>(dynamic_extent) ) const { span_EXPECTS( ( ( 0 <= offset && offset <= size() ) ) && ( count == static_cast<index_type>(dynamic_extent) || ( 0 <= count && offset + count <= size() ) ) ); return span< element_type, dynamic_extent >( data() + offset, count == static_cast<index_type>(dynamic_extent) ? size() - offset : count ); } // 26.7.3.4 Observers [span.obs] span_constexpr index_type size() const span_noexcept { return size_; } span_constexpr index_type size_bytes() const span_noexcept { return size() * to_size( sizeof( element_type ) ); } span_nodiscard span_constexpr bool empty() const span_noexcept { return size() == 0; } // 26.7.3.5 Element access [span.elem] span_constexpr_exp reference operator[]( index_type idx ) const { span_EXPECTS( 0 <= idx && idx < size() ); return *( data() + idx ); } #if span_FEATURE( MEMBER_CALL_OPERATOR ) span_deprecated("replace operator() with operator[]") span_constexpr_exp reference operator()( index_type idx ) const { span_EXPECTS( 0 <= idx && idx < size() ); return *( data() + idx ); } #endif #if span_FEATURE( MEMBER_AT ) span_constexpr14 reference at( index_type idx ) const { #if span_CONFIG( NO_EXCEPTIONS ) return this->operator[]( idx ); #else if ( idx < 0 || size() <= idx ) { detail::throw_out_of_range( idx, size() ); } return *( data() + idx ); #endif } #endif span_constexpr pointer data() const span_noexcept { return data_; } #if span_FEATURE( MEMBER_BACK_FRONT ) span_constexpr_exp reference front() const span_noexcept { span_EXPECTS( ! empty() ); return *data(); } span_constexpr_exp reference back() const span_noexcept { span_EXPECTS( ! empty() ); return *( data() + size() - 1 ); } #endif // xx.x.x.x Modifiers [span.modifiers] #if span_FEATURE( MEMBER_SWAP ) span_constexpr14 void swap( span & other ) span_noexcept { using std::swap; swap( data_, other.data_ ); swap( size_, other.size_ ); } #endif // 26.7.3.6 Iterator support [span.iterators] span_constexpr iterator begin() const span_noexcept { #if span_CPP11_OR_GREATER return { data() }; #else return iterator( data() ); #endif } span_constexpr iterator end() const span_noexcept { #if span_CPP11_OR_GREATER return { data() + size() }; #else return iterator( data() + size() ); #endif } span_constexpr const_iterator cbegin() const span_noexcept { #if span_CPP11_OR_GREATER return { data() }; #else return const_iterator( data() ); #endif } span_constexpr const_iterator cend() const span_noexcept { #if span_CPP11_OR_GREATER return { data() + size() }; #else return const_iterator( data() + size() ); #endif } span_constexpr reverse_iterator rbegin() const span_noexcept { return reverse_iterator( end() ); } span_constexpr reverse_iterator rend() const span_noexcept { return reverse_iterator( begin() ); } span_constexpr const_reverse_iterator crbegin() const span_noexcept { return const_reverse_iterator ( cend() ); } span_constexpr const_reverse_iterator crend() const span_noexcept { return const_reverse_iterator( cbegin() ); } private: pointer data_; index_type size_; }; // class template argument deduction guides: #if span_HAVE( DEDUCTION_GUIDES ) // span_CPP17_OR_GREATER template< class T, size_t N > span( T (&)[N] ) -> span<T, static_cast<extent_t>(N)>; template< class T, size_t N > span( std::array<T, N> & ) -> span<T, static_cast<extent_t>(N)>; template< class T, size_t N > span( std::array<T, N> const & ) -> span<const T, static_cast<extent_t>(N)>; template< class Container > span( Container& ) -> span<typename Container::value_type>; template< class Container > span( Container const & ) -> span<const typename Container::value_type>; #endif // span_HAVE( DEDUCTION_GUIDES ) // 26.7.3.7 Comparison operators [span.comparison] #if span_FEATURE( SAME ) template< class T1, extent_t E1, class T2, extent_t E2 > inline span_constexpr bool same( span<T1,E1> const & l, span<T2,E2> const & r ) span_noexcept { return detail::is_same<T1, T2>::value && l.size() == r.size() && static_cast<void const*>( l.data() ) == r.data(); } #endif template< class T1, extent_t E1, class T2, extent_t E2 > inline span_constexpr bool operator==( span<T1,E1> const & l, span<T2,E2> const & r ) { return #if span_FEATURE( SAME ) same( l, r ) || #endif ( l.size() == r.size() && std::equal( l.begin(), l.end(), r.begin() ) ); } template< class T1, extent_t E1, class T2, extent_t E2 > inline span_constexpr bool operator<( span<T1,E1> const & l, span<T2,E2> const & r ) { return std::lexicographical_compare( l.begin(), l.end(), r.begin(), r.end() ); } template< class T1, extent_t E1, class T2, extent_t E2 > inline span_constexpr bool operator!=( span<T1,E1> const & l, span<T2,E2> const & r ) { return !( l == r ); } template< class T1, extent_t E1, class T2, extent_t E2 > inline span_constexpr bool operator<=( span<T1,E1> const & l, span<T2,E2> const & r ) { return !( r < l ); } template< class T1, extent_t E1, class T2, extent_t E2 > inline span_constexpr bool operator>( span<T1,E1> const & l, span<T2,E2> const & r ) { return ( r < l ); } template< class T1, extent_t E1, class T2, extent_t E2 > inline span_constexpr bool operator>=( span<T1,E1> const & l, span<T2,E2> const & r ) { return !( l < r ); } // 26.7.2.6 views of object representation [span.objectrep] #if span_HAVE( BYTE ) || span_HAVE( NONSTD_BYTE ) template< class T, extent_t Extent > inline span_constexpr span< const detail::byte, ( (Extent == dynamic_extent) ? dynamic_extent : (span_sizeof(T) * Extent) ) > as_bytes( span<T,Extent> spn ) span_noexcept { #if 0 return { reinterpret_cast< detail::byte const * >( spn.data() ), spn.size_bytes() }; #else return span< const detail::byte, ( (Extent == dynamic_extent) ? dynamic_extent : (span_sizeof(T) * Extent) ) >( reinterpret_cast< detail::byte const * >( spn.data() ), spn.size_bytes() ); // NOLINT #endif } template< class T, extent_t Extent > inline span_constexpr span< detail::byte, ( (Extent == dynamic_extent) ? dynamic_extent : (span_sizeof(T) * Extent) ) > as_writeable_bytes( span<T,Extent> spn ) span_noexcept { #if 0 return { reinterpret_cast< detail::byte * >( spn.data() ), spn.size_bytes() }; #else return span< detail::byte, ( (Extent == dynamic_extent) ? dynamic_extent : (span_sizeof(T) * Extent) ) >( reinterpret_cast< detail::byte * >( spn.data() ), spn.size_bytes() ); // NOLINT #endif } #endif // span_HAVE( BYTE ) || span_HAVE( NONSTD_BYTE ) // extensions: non-member views: #if span_FEATURE( NON_MEMBER_FIRST_LAST_SUB ) && span_CPP11_120 #if ! span_FEATURE_TO_STD( MAKE_SPAN ) # error nonstd::span: non-member first(), last() and subspan() require make_span(), see span_FEATURE_MAKE_SPAN_TO_STD #endif template< extent_t Count, class T > span_constexpr auto first( T & t ) -> decltype( make_span(t).template first<Count>() ) { return make_span( t ).template first<Count>(); } template< class T > span_constexpr auto first( T & t, index_t count ) -> decltype( make_span(t).first(count) ) { return make_span( t ).first( count ); } template< extent_t Count, class T > span_constexpr auto last( T & t ) -> decltype( make_span(t).template last<Count>() ) { return make_span(t).template last<Count>(); } template< class T > span_constexpr auto last( T & t, extent_t count ) -> decltype( make_span(t).last(count) ) { return make_span( t ).last( count ); } template< index_t Offset, extent_t Count = dynamic_extent, class T > span_constexpr auto subspan( T & t ) -> decltype( make_span(t).template subspan<Offset, Count>() ) { return make_span( t ).template subspan<Offset, Count>(); } template< class T > span_constexpr auto subspan( T & t, index_t offset, extent_t count = dynamic_extent ) -> decltype( make_span(t).subspan(offset, count) ) { return make_span( t ).subspan( offset, count ); } #endif // span_FEATURE( NON_MEMBER_FIRST_LAST_SUB ) } // namespace span_lite } // namespace nonstd // make available in nonstd: namespace nonstd { using span_lite::dynamic_extent; using span_lite::span; using span_lite::with_container; using span_lite::operator==; using span_lite::operator!=; using span_lite::operator<; using span_lite::operator<=; using span_lite::operator>; using span_lite::operator>=; #if span_HAVE( BYTE ) using span_lite::as_bytes; using span_lite::as_writeable_bytes; #endif #if span_FEATURE( SAME ) using span_lite::same; #endif } // namespace nonstd #endif // span_USES_STD_SPAN // make_span() [span-lite extension]: #if span_FEATURE_TO_STD( MAKE_SPAN ) namespace nonstd { namespace span_lite { template< class T > inline span_constexpr span<T> make_span( T * ptr, index_t count ) span_noexcept { return span<T>( ptr, count ); } template< class T > inline span_constexpr span<T> make_span( T * first, T * last ) span_noexcept { return span<T>( first, last ); } template< class T, size_t N > inline span_constexpr span<T, static_cast<extent_t>(N)> make_span( T ( &arr )[ N ] ) span_noexcept { return span<T, static_cast<extent_t>(N)>( &arr[ 0 ], N ); } #if span_USES_STD_SPAN || span_HAVE( ARRAY ) template< class T, size_t N > inline span_constexpr span<T, static_cast<extent_t>(N)> make_span( std::array< T, N > & arr ) span_noexcept { return span<T, static_cast<extent_t>(N)>( arr ); } template< class T, size_t N > inline span_constexpr span< const T, static_cast<extent_t>(N) > make_span( std::array< T, N > const & arr ) span_noexcept { return span<const T, static_cast<extent_t>(N)>( arr ); } #endif // span_HAVE( ARRAY ) #if span_USES_STD_SPAN || ( span_HAVE( CONSTRAINED_SPAN_CONTAINER_CTOR ) && span_HAVE( AUTO ) ) template< class Container, class = decltype(std::declval<Container>().data()) > inline span_constexpr auto make_span( Container & cont ) span_noexcept -> span< typename Container::value_type > { return span< typename Container::value_type >( cont ); } template< class Container, class = decltype(std::declval<Container>().data()) > inline span_constexpr auto make_span( Container const & cont ) span_noexcept -> span< const typename Container::value_type > { return span< const typename Container::value_type >( cont ); } #else template< class T, class Allocator > inline span_constexpr span<T> make_span( std::vector<T, Allocator> & cont ) span_noexcept { return span<T>( with_container, cont ); } template< class T, class Allocator > inline span_constexpr span<const T> make_span( std::vector<T, Allocator> const & cont ) span_noexcept { return span<const T>( with_container, cont ); } #endif // span_USES_STD_SPAN || ( ... ) #if ! span_USES_STD_SPAN && span_FEATURE_TO_STD( WITH_CONTAINER ) template< class Container > inline span_constexpr span<typename Container::value_type> make_span( with_container_t, Container & cont ) span_noexcept { return span< typename Container::value_type >( with_container, cont ); } template< class Container > inline span_constexpr span<const typename Container::value_type> make_span( with_container_t, Container const & cont ) span_noexcept { return span< const typename Container::value_type >( with_container, cont ); } #endif // ! span_USES_STD_SPAN && span_FEATURE( WITH_CONTAINER ) } // namespace span_lite } // namespace nonstd // make available in nonstd: namespace nonstd { using span_lite::make_span; } // namespace nonstd #endif // #if span_FEATURE_TO_STD( MAKE_SPAN ) #if span_CPP11_OR_GREATER && span_FEATURE( BYTE_SPAN ) && ( span_HAVE( BYTE ) || span_HAVE( NONSTD_BYTE ) ) namespace nonstd { namespace span_lite { template< class T > inline span_constexpr auto byte_span( T & t ) span_noexcept -> span< detail::byte, span_sizeof(T) > { return span< detail::byte, span_sizeof(t) >( reinterpret_cast< detail::byte * >( &t ), span_sizeof(T) ); } template< class T > inline span_constexpr auto byte_span( T const & t ) span_noexcept -> span< const detail::byte, span_sizeof(T) > { return span< const detail::byte, span_sizeof(t) >( reinterpret_cast< detail::byte const * >( &t ), span_sizeof(T) ); } } // namespace span_lite } // namespace nonstd // make available in nonstd: namespace nonstd { using span_lite::byte_span; } // namespace nonstd #endif // span_FEATURE( BYTE_SPAN ) #if ! span_USES_STD_SPAN span_RESTORE_WARNINGS() #endif // span_USES_STD_SPAN #endif // NONSTD_SPAN_HPP_INCLUDED //#include "nonstd/span.hpp" #include <array> #include <numeric> #include <vector> using nonstd::span; using index_type = span<int>::index_type; constexpr index_type arraySize = 3; std::vector< std::array<int, arraySize> > memory = { { 1,2,3 }, { 4,5,6 }, { 7,8,9 }, { 0,0,0 }, { 0,0,0 } }; size_t numArrays() { return 4; } template< typename T, index_type Extent > int consume( span<T,Extent> spn ) { return std::accumulate( spn.begin(), spn.end(), 0 ); } template< typename T > int consume( span<T> spn, size_t numArrays ) { return std::accumulate( spn.begin(), spn.end(), 0, [](auto r, auto const & spn) { return r + consume( span(spn ) ); } ); } int main() { return consume( span( memory ), numArrays() ); }
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