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c++ source #1
Output
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Intel asm syntax
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Verbose demangling
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 13.1.0
ARM GCC 13.2.0
ARM GCC 13.2.0 (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 13.1.0
ARM64 gcc 13.2.0
ARM64 gcc 5.4
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 13.1.0
AVR gcc 13.2.0
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 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)
M68K gcc 13.1.0
M68K gcc 13.2.0
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 13.1.0
RISC-V (32-bits) gcc 13.2.0
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 13.1.0
RISC-V (64-bits) gcc 13.2.0
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 13.1.0
SPARC LEON gcc 13.2.0
SPARC gcc 12.2.0
SPARC gcc 12.3.0
SPARC gcc 13.1.0
SPARC gcc 13.2.0
SPARC64 gcc 12.2.0
SPARC64 gcc 12.3.0
SPARC64 gcc 13.1.0
SPARC64 gcc 13.2.0
TI C6x gcc 12.2.0
TI C6x gcc 12.3.0
TI C6x gcc 13.1.0
TI C6x gcc 13.2.0
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 v19.28 VS16.9
arm64 msvc v19.29 VS16.10
arm64 msvc v19.29 VS16.11
arm64 msvc v19.30
arm64 msvc v19.31
arm64 msvc v19.32
arm64 msvc v19.33
arm64 msvc v19.34
arm64 msvc v19.35
arm64 msvc v19.36
arm64 msvc v19.37
arm64 msvc v19.38
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 13.1.0
loongarch64 gcc 13.2.0
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 13.1.0
mips gcc 13.2.0
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 13.1.0
mips64 (el) gcc 13.2.0
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 13.1.0
mips64 gcc 13.2.0
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 13.1.0
mipsel gcc 13.2.0
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 13.1.0
power gcc 13.2.0
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 13.1.0
power64 gcc 13.2.0
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 13.1.0
power64le gcc 13.2.0
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 13.1.0
s390x gcc 13.2.0
sh gcc 12.2.0
sh gcc 12.3.0
sh gcc 13.1.0
sh gcc 13.2.0
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
x64 msvc v19.14 (WINE)
x64 msvc v19.15
x64 msvc v19.16
x64 msvc v19.20
x64 msvc v19.21
x64 msvc v19.22
x64 msvc v19.23
x64 msvc v19.24
x64 msvc v19.25
x64 msvc v19.26
x64 msvc v19.27
x64 msvc v19.28
x64 msvc v19.28 VS16.9
x64 msvc v19.29 VS16.10
x64 msvc v19.29 VS16.11
x64 msvc v19.30
x64 msvc v19.31
x64 msvc v19.32
x64 msvc v19.33
x64 msvc v19.34
x64 msvc v19.35
x64 msvc v19.36
x64 msvc v19.37
x64 msvc v19.38
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
x86 msvc v19.14 (WINE)
x86 msvc v19.15
x86 msvc v19.16
x86 msvc v19.20
x86 msvc v19.21
x86 msvc v19.22
x86 msvc v19.23
x86 msvc v19.24
x86 msvc v19.25
x86 msvc v19.26
x86 msvc v19.27
x86 msvc v19.28
x86 msvc v19.28 VS16.9
x86 msvc v19.29 VS16.10
x86 msvc v19.29 VS16.11
x86 msvc v19.30
x86 msvc v19.31
x86 msvc v19.32
x86 msvc v19.33
x86 msvc v19.34
x86 msvc v19.35
x86 msvc v19.36
x86 msvc v19.37
x86 msvc v19.38
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
x86-64 Zapcc 190308
x86-64 clang (amd-stg-open)
x86-64 clang (assertions trunk)
x86-64 clang (clangir)
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 metaprogramming - P2632)
x86-64 clang (experimental pattern matching)
x86-64 clang (old concepts branch)
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)
x86-64 clang 12.0.1
x86-64 clang 13.0.0
x86-64 clang 13.0.0 (assertions)
x86-64 clang 13.0.1
x86-64 clang 14.0.0
x86-64 clang 14.0.0 (assertions)
x86-64 clang 15.0.0
x86-64 clang 15.0.0 (assertions)
x86-64 clang 16.0.0
x86-64 clang 16.0.0 (assertions)
x86-64 clang 17.0.1
x86-64 clang 17.0.1 (assertions)
x86-64 clang 18.1.0
x86-64 clang 18.1.0 (assertions)
x86-64 clang 2.6.0 (assertions)
x86-64 clang 2.7.0 (assertions)
x86-64 clang 2.8.0 (assertions)
x86-64 clang 2.9.0 (assertions)
x86-64 clang 3.0.0
x86-64 clang 3.0.0 (assertions)
x86-64 clang 3.1
x86-64 clang 3.1 (assertions)
x86-64 clang 3.2
x86-64 clang 3.2 (assertions)
x86-64 clang 3.3
x86-64 clang 3.3 (assertions)
x86-64 clang 3.4 (assertions)
x86-64 clang 3.4.1
x86-64 clang 3.5
x86-64 clang 3.5 (assertions)
x86-64 clang 3.5.1
x86-64 clang 3.5.2
x86-64 clang 3.6
x86-64 clang 3.6 (assertions)
x86-64 clang 3.7
x86-64 clang 3.7 (assertions)
x86-64 clang 3.7.1
x86-64 clang 3.8
x86-64 clang 3.8 (assertions)
x86-64 clang 3.8.1
x86-64 clang 3.9.0
x86-64 clang 3.9.0 (assertions)
x86-64 clang 3.9.1
x86-64 clang 4.0.0
x86-64 clang 4.0.0 (assertions)
x86-64 clang 4.0.1
x86-64 clang 5.0.0
x86-64 clang 5.0.0 (assertions)
x86-64 clang 5.0.1
x86-64 clang 5.0.2
x86-64 clang 6.0.0
x86-64 clang 6.0.0 (assertions)
x86-64 clang 6.0.1
x86-64 clang 7.0.0
x86-64 clang 7.0.0 (assertions)
x86-64 clang 7.0.1
x86-64 clang 7.1.0
x86-64 clang 8.0.0
x86-64 clang 8.0.0 (assertions)
x86-64 clang 8.0.1
x86-64 clang 9.0.0
x86-64 clang 9.0.0 (assertions)
x86-64 clang 9.0.1
x86-64 clang rocm-4.5.2
x86-64 clang rocm-5.0.2
x86-64 clang rocm-5.1.3
x86-64 clang rocm-5.2.3
x86-64 clang rocm-5.3.3
x86-64 clang rocm-5.7.0
x86-64 gcc (contract labels)
x86-64 gcc (contracts natural syntax)
x86-64 gcc (contracts)
x86-64 gcc (coroutines)
x86-64 gcc (modules)
x86-64 gcc (trunk)
x86-64 gcc 10.1
x86-64 gcc 10.2
x86-64 gcc 10.3
x86-64 gcc 10.4
x86-64 gcc 10.5
x86-64 gcc 11.1
x86-64 gcc 11.2
x86-64 gcc 11.3
x86-64 gcc 11.4
x86-64 gcc 12.1
x86-64 gcc 12.2
x86-64 gcc 12.3
x86-64 gcc 13.1
x86-64 gcc 13.2
x86-64 gcc 3.4.6
x86-64 gcc 4.0.4
x86-64 gcc 4.1.2
x86-64 gcc 4.4.7
x86-64 gcc 4.5.3
x86-64 gcc 4.6.4
x86-64 gcc 4.7.1
x86-64 gcc 4.7.2
x86-64 gcc 4.7.3
x86-64 gcc 4.7.4
x86-64 gcc 4.8.1
x86-64 gcc 4.8.2
x86-64 gcc 4.8.3
x86-64 gcc 4.8.4
x86-64 gcc 4.8.5
x86-64 gcc 4.9.0
x86-64 gcc 4.9.1
x86-64 gcc 4.9.2
x86-64 gcc 4.9.3
x86-64 gcc 4.9.4
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#include <cassert> #include <cstdlib> #include <iostream> #include <iterator> #include <memory> #include <type_traits> #include <utility> #include <vector> namespace CxxUtils { /// Used to specify a subrange of indefinite size in subspan(). inline constexpr size_t dynamic_extent = static_cast<size_t>(-1); /** * @brief Simplified version of the C++20 std::span. * * This class is meant to be very similar to the C++20 std::span class. * There are however a few differences. * - The option for a fixed-length span is not implemented; hence, there * is no second template argument. * - Constructors from arrays / std::array are not implemented. * - The external member functions as_bytes / as_writable_bytes and * deduction guides are not implemented. * * Contact the core sw group if any of these are a problem. * * In addition: * - The concept requirements on the constructors are not checked. * - Accessor methods are split into const / non-const versions. * This is required to avoid warnings from the thread-safety checker, * but be careful of potential incompatibilies with std::span. * Again, contact the core sw group if this is an issue. */ template <class T> class span { public: /// Required typedefs. using element_type = T; using value_type = std::remove_cv_t<T>; using size_type = size_t; using difference_type = ptrdiff_t; using pointer = T*; using const_pointer = const T*; using reference = element_type&; using const_reference = const element_type&; using iterator = pointer; using const_iterator = const_pointer; using reverse_iterator = std::reverse_iterator<iterator>; using const_reverse_iterator = std::reverse_iterator<const_iterator>; /* * @brief Default constructor. * Makes an empty span. */ span(); /** * @brief Constructor from start and length. * @param ptr Start of the span. * @param sz Length of the span. */ span(T* ptr, size_type sz); /** * @brief Constructor from start and end. * @param beg Start of the span. * @param end One past the end of the span. */ span(T* beg, T* end); // Default copy / assignment. span(const span&) = default; span& operator=(const span&) = default; /** * @brief Return the size of the span. */ constexpr size_type size() const noexcept; /** * @brief Return the size of contents of the span, in bytes. */ constexpr size_type size_bytes() const noexcept; /** * @brief Test if the span is empty. */ [[nodiscard]] constexpr bool empty() const noexcept; /** * @brief Return a reference to the first element in the span. */ constexpr reference front() noexcept; /** * @brief Return a reference to the first element in the span. */ constexpr const_reference front() const noexcept; /** * @brief Return a reference to the last element in the span. */ constexpr reference back() noexcept; /** * @brief Return a reference to the last element in the span. */ constexpr const_reference back() const noexcept; /** * @brief Return a reference to the i-th element in the span. * @param i Index of the element to return. */ constexpr reference operator[](size_type i) noexcept; /** * @brief Return a reference to the i-th element in the span. * @param i Index of the element to return. */ constexpr const_reference operator[](size_type i) const noexcept; /** * @brief Return a pointer to the start of the span. */ constexpr pointer data() noexcept; /** * @brief Return a pointer to the start of the span. */ constexpr const_pointer data() const noexcept; /** * @brief Return a begin iterator. */ constexpr iterator begin() noexcept; /** * @brief Return a begin iterator. */ constexpr const_iterator begin() const noexcept; /** * @brief Return an end iterator. */ constexpr iterator end() noexcept; /** * @brief Return an end iterator. */ constexpr const_iterator end() const noexcept; /** * @brief Return a begin reverse iterator. */ constexpr reverse_iterator rbegin() noexcept; /** * @brief Return a begin reverse iterator. */ constexpr const_reverse_iterator rbegin() const noexcept; /** * @brief Return an end reverse iterator. */ constexpr reverse_iterator rend() noexcept; /** * @brief Return an end reverse iterator. */ constexpr const_reverse_iterator rend() const noexcept; /** * @brief Return a subspan from the start. * @param n Number of elements in the subspan. */ constexpr span first(size_type n) noexcept; /** * @brief Return a subspan from the start. * @param n Number of elements in the subspan. */ constexpr span<const T> first(size_type n) const noexcept; /** * @brief Return a subspan from the end. * @param n Number of elements in the subspan. */ constexpr span last(size_type n) noexcept; /** * @brief Return a subspan from the end. * @param n Number of elements in the subspan. */ constexpr span<const T> last(size_type n) const noexcept; /** * @brief Return a subspan. * @param offs Starting element of the subspan. * @param n Number of elements in the subspan. * If defaulted, take all remaining elements. */ constexpr span subspan(size_type offs, size_type n = dynamic_extent) noexcept; /** * @brief Return a subspan. * @param offs Starting element of the subspan. * @param n Number of elements in the subspan. * If defaulted, take all remaining elements. */ constexpr span<const T> subspan( size_type offs, size_type n = dynamic_extent) const noexcept; private: /// Pointer to the start of the span. T* m_ptr; /// Number of elements in the span. size_t m_size; }; } // namespace CxxUtils namespace CxxUtils { /* * @brief Default constructor. * Makes an empty span. */ template <class T> inline span<T>::span() : m_ptr(nullptr), m_size(0) {} /** * @brief Constructor from start and length. * @param ptr Start of the span. * @param sz Length of the span. */ template <class T> inline span<T>::span(T* ptr, size_type sz) : m_ptr(ptr), m_size(sz) {} /** * @brief Constructor from start and end. * @param beg Start of the span. * @param end One past the end of the span. */ template <class T> inline span<T>::span(T* beg, T* end) : m_ptr(beg), m_size(end - beg) {} /** * @brief Return the size of the span. */ template <class T> inline constexpr typename span<T>::size_type span<T>::size() const noexcept { return m_size; } /** * @brief Return the size of contents of the span, in bytes. */ template <class T> inline constexpr typename span<T>::size_type span<T>::size_bytes() const noexcept { return m_size * sizeof(element_type); } /** * @brief Test if the span is empty. */ template <class T> inline constexpr bool span<T>::empty() const noexcept { return m_size == 0; } /** * @brief Return a reference to the first element in the span. */ template <class T> inline constexpr typename span<T>::reference span<T>::front() noexcept { assert(m_ptr != nullptr); return *m_ptr; } /** * @brief Return a reference to the first element in the span. */ template <class T> inline constexpr typename span<T>::const_reference span<T>::front() const noexcept { assert(m_ptr != nullptr); return *m_ptr; } /** * @brief Return a reference to the last element in the span. */ template <class T> inline constexpr typename span<T>::reference span<T>::back() noexcept { assert(m_ptr != nullptr); return *(m_ptr + m_size - 1); } /** * @brief Return a reference to the last element in the span. */ template <class T> inline constexpr typename span<T>::const_reference span<T>::back() const noexcept { assert(m_ptr != nullptr); return *(m_ptr + m_size - 1); } /** * @brief Return a reference to the i-th element in the span. * @param i Index of the element to return. */ template <class T> inline constexpr typename span<T>::reference span<T>::operator[]( size_type i) noexcept { assert(i < m_size); return m_ptr[i]; } /** * @brief Return a reference to the i-th element in the span. * @param i Index of the element to return. */ template <class T> inline constexpr typename span<T>::const_reference span<T>::operator[]( size_type i) const noexcept { assert(i < m_size); return m_ptr[i]; } /** * @brief Return a pointer to the start of the span. */ template <class T> inline constexpr typename span<T>::pointer span<T>::data() noexcept { return m_ptr; } /** * @brief Return a pointer to the start of the span. */ template <class T> inline constexpr typename span<T>::const_pointer span<T>::data() const noexcept { return m_ptr; } /** * @brief Return a begin iterator. */ template <class T> inline constexpr typename span<T>::iterator span<T>::begin() noexcept { return m_ptr; } /** * @brief Return a begin iterator. */ template <class T> inline constexpr typename span<T>::const_iterator span<T>::begin() const noexcept { return m_ptr; } /** * @brief Return an end iterator. */ template <class T> inline constexpr typename span<T>::iterator span<T>::end() noexcept { return m_ptr + m_size; } /** * @brief Return an end iterator. */ template <class T> inline constexpr typename span<T>::const_iterator span<T>::end() const noexcept { return m_ptr + m_size; } /** * @brief Return a begin reverse iterator. */ template <class T> inline constexpr typename span<T>::reverse_iterator span<T>::rbegin() noexcept { return reverse_iterator(end()); } /** * @brief Return a begin reverse iterator. */ template <class T> inline constexpr typename span<T>::const_reverse_iterator span<T>::rbegin() const noexcept { return const_reverse_iterator(end()); } /** * @brief Return an end reverse iterator. */ template <class T> inline constexpr typename span<T>::reverse_iterator span<T>::rend() noexcept { return reverse_iterator(begin()); } /** * @brief Return an end reverse iterator. */ template <class T> inline constexpr typename span<T>::const_reverse_iterator span<T>::rend() const noexcept { return const_reverse_iterator(begin()); } /** * @brief Return a subspan from the start. * @param n Number of elements in the subspan. */ template <class T> inline constexpr span<T> span<T>::first(size_type n) noexcept { assert(n <= size()); return span(m_ptr, n); } /** * @brief Return a subspan from the start. * @param n Number of elements in the subspan. */ template <class T> inline constexpr span<const T> span<T>::first(size_type n) const noexcept { assert(n <= size()); return span<const T>(m_ptr, n); } /** * @brief Return a subspan from the end. * @param n Number of elements in the subspan. */ template <class T> inline constexpr span<T> span<T>::last(size_type n) noexcept { assert(n <= size()); return span(m_ptr + (size() - n), n); } /** * @brief Return a subspan from the end. * @param n Number of elements in the subspan. */ template <class T> inline constexpr span<const T> span<T>::last(size_type n) const noexcept { assert(n <= size()); return span<const T>(m_ptr + (size() - n), n); } /** * @brief Return a subspan. * @param offs Starting element of the subspan. * @param n Number of elements in the subspan. * If defaulted, take all remaining elements. */ template <class T> inline constexpr span<T> span<T>::subspan( size_type offs, size_type n /*= dynamic_extent*/) noexcept { assert(offs <= size()); if (n == dynamic_extent) n = size() - offs; else { assert(n <= size()); assert(offs + n <= size()); } return span(m_ptr + offs, n); } /** * @brief Return a subspan. * @param offs Starting element of the subspan. * @param n Number of elements in the subspan. * If defaulted, take all remaining elements. */ template <class T> inline constexpr span<const T> span<T>::subspan( size_type offs, size_type n /*= dynamic_extent*/) const noexcept { assert(offs <= size()); if (n == dynamic_extent) n = size() - offs; else { assert(n <= size()); assert(offs + n <= size()); } return span<const T>(m_ptr + offs, n); } } // namespace CxxUtils template <class T> class ConstSharedPtrSpan { public: ConstSharedPtrSpan(const std::vector<std::shared_ptr<T>>& m_var) : m_span(&*(m_var.begin()), &*(m_var.end())) {} //access the ptr T const* const operator[](size_t i) const { return m_span[i].get(); } constexpr bool empty() const noexcept { return m_span.empty(); } constexpr size_t size() const noexcept { return m_span.size(); } private: CxxUtils::span<const std::shared_ptr<T>> m_span; }; class foo { public: foo(const std::vector<std::shared_ptr<double>>& in) : m_var(in) {} std::vector<std::shared_ptr<double>>& get() { return m_var; } ConstSharedPtrSpan<double> get() const { return ConstSharedPtrSpan<double>(m_var); } std::vector<std::shared_ptr<double>> m_var; }; int main() { std::vector<std::shared_ptr<double>> c; c.push_back(std::make_shared<double>(4)); c.push_back(std::make_shared<double>(5)); foo a(c); auto span1 = a.get(); for (size_t i = 0; i < span1.size(); ++i) { std::cout << *span1[i] << '\n'; ++(*span1[i]); } std::cout << "-----------" << '\n'; auto span2 = a.get(); for (size_t i = 0; i < span2.size(); ++i) { std::cout << *span2[i] << '\n'; } std::cout << "-----------" << '\n'; const foo& b = a; auto span3 = b.get(); for (size_t i = 0; i < span3.size(); ++i) { std::cout << *span3[i] << '\n'; // does not compile good //++(*span3[i]); } }
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