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c++ source #1
Output
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Intel asm syntax
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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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#include <fmt/format.h> #include <fmt/ranges.h> #include <algorithm> #include <ranges> // The existing split implementation, as modified by P2210 namespace std::ranges { template <input_range _Vp, forward_range _Pattern> requires view<_Vp> && view<_Pattern> && indirectly_comparable<iterator_t<_Vp>, iterator_t<_Pattern>, ranges::equal_to> && (forward_range<_Vp> || __detail::__tiny_range<_Pattern>)class lazy_split_view : public view_interface<lazy_split_view<_Vp, _Pattern>> { private: template <bool _Const> struct _InnerIter; template <bool _Const> struct _OuterIter { private: using _Parent = __detail::__maybe_const_t<_Const, lazy_split_view>; using _Base = __detail::__maybe_const_t<_Const, _Vp>; constexpr bool __at_end() const { return __current() == ranges::end(_M_parent->_M_base) && !trailing_empty; } // [range.split.outer] p1 // Many of the following specifications refer to the notional member // current of outer-iterator. current is equivalent to current_ if // V models forward_range, and parent_->current_ otherwise. constexpr auto& __current() noexcept { if constexpr (forward_range<_Vp>) return _M_current; else return _M_parent->_M_current; } constexpr auto& __current() const noexcept { if constexpr (forward_range<_Vp>) return _M_current; else return _M_parent->_M_current; } _Parent* _M_parent = nullptr; // XXX: _M_current is present only if "V models forward_range" [[no_unique_address]] __detail::__maybe_present_t<forward_range<_Vp>, iterator_t<_Base>> _M_current; // P2210: need this extra member on the outer iterator bool trailing_empty = false; public: using iterator_concept = conditional_t<forward_range<_Base>, forward_iterator_tag, input_iterator_tag>; using iterator_category = input_iterator_tag; using difference_type = range_difference_t<_Base>; struct value_type : view_interface<value_type> { private: _OuterIter _M_i = _OuterIter(); public: value_type() = default; constexpr explicit value_type(_OuterIter __i) : _M_i(std::move(__i)) {} constexpr _InnerIter<_Const> begin() const requires copyable<_OuterIter> { return _InnerIter<_Const>{_M_i}; } constexpr _InnerIter<_Const> begin() requires(!copyable<_OuterIter>) { return _InnerIter<_Const>{std::move(_M_i)}; } constexpr default_sentinel_t end() const { return default_sentinel; } }; _OuterIter() = default; constexpr explicit _OuterIter(_Parent* __parent) requires( !forward_range<_Base>) : _M_parent(__parent) {} constexpr _OuterIter(_Parent* __parent, iterator_t<_Base> __current) requires forward_range<_Base> : _M_parent(__parent), _M_current(std::move(__current)) {} constexpr _OuterIter(_OuterIter<!_Const> __i) requires _Const && convertible_to<iterator_t<_Vp>, iterator_t<_Base>> : _M_parent(__i._M_parent), _M_current(std::move(__i._M_current)) {} constexpr value_type operator*() const { return value_type{*this}; } constexpr _OuterIter& operator++() { const auto __end = ranges::end(_M_parent->_M_base); if (__current() == __end) { // LWG3478: there's no trailing empty range (if there was one before) trailing_empty = false; return *this; } const auto [__pbegin, __pend] = subrange{_M_parent->_M_pattern}; if (__pbegin == __pend) { ++__current(); } else if constexpr (__detail::__tiny_range<_Pattern>) { __current() = ranges::find(std::move(__current()), __end, *__pbegin); if (__current() != __end) { ++__current(); // LWG3478: if the delimiter is the last element, we still have one more empty to go if (__current() == __end) { trailing_empty = true; } } } else { do { auto [__b, __p] = __detail::mismatch(__current(), __end, __pbegin, __pend); if (__p == __pend) { __current() = __b; // LWG3478: set trailing_empty to true in this case if (__current() == __end) { trailing_empty = true; } break; } } while (++__current() != __end); } return *this; } constexpr decltype(auto) operator++(int) { if constexpr (forward_range<_Base>) { auto __tmp = *this; ++*this; return __tmp; } else ++*this; } friend constexpr bool operator==(const _OuterIter& __x, const _OuterIter& __y) requires forward_range<_Base> { // P2210: also check trailing_empty return __x._M_current == __y._M_current && __x.trailing_empty == __y.trailing_empty; } friend constexpr bool operator==(const _OuterIter& __x, default_sentinel_t) { return __x.__at_end(); }; friend _OuterIter<!_Const>; friend _InnerIter<_Const>; }; template <bool _Const> struct _InnerIter { private: using _Base = __detail::__maybe_const_t<_Const, _Vp>; constexpr bool __at_end() const { auto [__pcur, __pend] = subrange{_M_i._M_parent->_M_pattern}; auto __end = ranges::end(_M_i._M_parent->_M_base); if constexpr (__detail::__tiny_range<_Pattern>) { const auto& __cur = _M_i_current(); if (__cur == __end) return true; if (__pcur == __pend) return _M_incremented; return *__cur == *__pcur; } else { auto __cur = _M_i_current(); if (__cur == __end) return true; if (__pcur == __pend) return _M_incremented; do { if (*__cur != *__pcur) return false; if (++__pcur == __pend) return true; } while (++__cur != __end); return false; } } static constexpr auto _S_iter_cat() { using _Cat = typename iterator_traits<iterator_t<_Base>>::iterator_category; if constexpr (derived_from<_Cat, forward_iterator_tag>) return forward_iterator_tag{}; else return _Cat{}; } constexpr auto& _M_i_current() noexcept { return _M_i.__current(); } constexpr auto& _M_i_current() const noexcept { return _M_i.__current(); } _OuterIter<_Const> _M_i = _OuterIter<_Const>(); bool _M_incremented = false; public: using iterator_concept = typename _OuterIter<_Const>::iterator_concept; using iterator_category = decltype(_S_iter_cat()); using value_type = range_value_t<_Base>; using difference_type = range_difference_t<_Base>; _InnerIter() = default; constexpr explicit _InnerIter(_OuterIter<_Const> __i) : _M_i(std::move(__i)) {} constexpr decltype(auto) operator*() const { return *_M_i_current(); } // P2210: add base() to inner iterator constexpr iterator_t<_Base> base() const& requires copyable<iterator_t<_Base>> { return _M_i_current(); } constexpr iterator_t<_Base> base() && { return std::move(_M_i_current()); } constexpr _InnerIter& operator++() { _M_incremented = true; if constexpr (!forward_range<_Base>) if constexpr (_Pattern::size() == 0) return *this; ++_M_i_current(); return *this; } constexpr decltype(auto) operator++(int) { if constexpr (forward_range<_Vp>) { auto __tmp = *this; ++*this; return __tmp; } else ++*this; } friend constexpr bool operator==(const _InnerIter& __x, const _InnerIter& __y) requires forward_range<_Base> { return __x._M_i == __y._M_i; } friend constexpr bool operator==(const _InnerIter& __x, default_sentinel_t) { return __x.__at_end(); } friend constexpr decltype(auto) iter_move(const _InnerIter& __i) noexcept( noexcept(ranges::iter_move(__i._M_i_current()))) { return ranges::iter_move(__i._M_i_current()); } friend constexpr void iter_swap(const _InnerIter& __x, const _InnerIter& __y) noexcept(noexcept( ranges::iter_swap(__x._M_i_current(), __y._M_i_current()))) requires indirectly_swappable<iterator_t<_Base>> { ranges::iter_swap(__x._M_i_current(), __y._M_i_current()); } }; _Pattern _M_pattern = _Pattern(); // XXX: _M_current is "present only if !forward_range<V>" [[no_unique_address]] __detail::__maybe_present_t<!forward_range<_Vp>, iterator_t<_Vp>> _M_current; _Vp _M_base = _Vp(); public: lazy_split_view() = default; constexpr lazy_split_view(_Vp __base, _Pattern __pattern) : _M_pattern(std::move(__pattern)), _M_base(std::move(__base)) {} template <input_range _Range> requires constructible_from<_Vp, views::all_t<_Range>> && constructible_from<_Pattern, single_view<range_value_t<_Range>>> constexpr lazy_split_view(_Range&& __r, range_value_t<_Range> __e) : _M_pattern(std::move(__e)), _M_base(views::all(std::forward<_Range>(__r))) {} constexpr _Vp base() const& requires copy_constructible<_Vp> { return _M_base; } constexpr _Vp base() && { return std::move(_M_base); } constexpr auto begin() { if constexpr (forward_range<_Vp>) return _OuterIter<__detail::__simple_view<_Vp>>{this, ranges::begin(_M_base)}; else { _M_current = ranges::begin(_M_base); return _OuterIter<false>{this}; } } constexpr auto begin() const requires forward_range<_Vp> && forward_range<const _Vp> { return _OuterIter<true>{this, ranges::begin(_M_base)}; } constexpr auto end() requires forward_range<_Vp> && common_range<_Vp> { return _OuterIter<__detail::__simple_view<_Vp>>{this, ranges::end(_M_base)}; } constexpr auto end() const { if constexpr (forward_range<_Vp> && forward_range<const _Vp> && common_range<const _Vp>) return _OuterIter<true>{this, ranges::end(_M_base)}; else return default_sentinel; } }; template <typename _Range, typename _Pred> lazy_split_view(_Range&&, _Pred&&) -> lazy_split_view<views::all_t<_Range>, views::all_t<_Pred>>; template <input_range _Range> lazy_split_view(_Range&&, range_value_t<_Range>) -> lazy_split_view<views::all_t<_Range>, single_view<range_value_t<_Range>>>; namespace views { inline constexpr __adaptor::_RangeAdaptor lazy_split = []<viewable_range _Range, typename _Fp>(_Range&& __r, _Fp&& __f) { return lazy_split_view{std::forward<_Range>(__r), std::forward<_Fp>(__f)}; }; } // namespace views } // namespace std::ranges // The new split implementation from P2210, here named split2/split_view2 namespace std::ranges { template <forward_range V, forward_range Pattern> requires view<V> && view<Pattern> && indirectly_comparable<iterator_t<V>, iterator_t<Pattern>, ranges::equal_to> class split_view2 : public view_interface<split_view2<V, Pattern>> { private: V base_ = V(); Pattern pattern_ = Pattern(); struct iterator; struct sentinel; struct iterator { private: friend sentinel; split_view2* parent_ = nullptr; iterator_t<V> cur_ = iterator_t<V>(); subrange<iterator_t<V>> next_ = subrange<iterator_t<V>>(); bool trailing_empty_ = false; public: using iterator_concept = forward_iterator_tag; using iterator_category = input_iterator_tag; using value_type = subrange<iterator_t<V>>; using difference_type = range_difference_t<V>; iterator() = default; constexpr iterator(split_view2& parent, iterator_t<V> current, subrange<iterator_t<V>> next) : parent_(&parent), cur_(current), next_(next) {} constexpr iterator_t<V> base() const { return cur_; } constexpr value_type operator*() const { return {cur_, next_.begin()}; } constexpr iterator& operator++() { cur_ = next_.begin(); if (cur_ != ranges::end(parent_->base_)) { cur_ = next_.end(); if (cur_ == ranges::end(parent_->base_)) { trailing_empty_ = true; next_ = {cur_, cur_}; } else { next_ = parent_->find_next(cur_); } } else { trailing_empty_ = false; } return *this; } constexpr iterator operator++(int) { auto tmp = *this; ++*this; return tmp; } constexpr bool operator==(const iterator& rhs) const { return cur_ == rhs.cur_ && trailing_empty_ == rhs.trailing_empty_; } }; struct sentinel { private: sentinel_t<V> end_ = sentinel_t<V>(); public: sentinel() = default; constexpr explicit sentinel(split_view2& parent) : end_(ranges::end(parent.base_)) { } constexpr bool operator==(const iterator& x) const { return x.cur_ == end_ && !x.trailing_empty_; } }; public: split_view2() = default; constexpr split_view2(V base, Pattern pattern) : base_(std::move(base)), pattern_(std::move(pattern)) {} template <forward_range R> requires constructible_from<V, views::all_t<R>> && constructible_from<Pattern, single_view<range_value_t<R>>> constexpr split_view2(R&& r, range_value_t<R> e) : base_(views::all(std::forward<R>(r))), pattern_(views::single(std::move(e))) {} constexpr V base() const& requires copyable<V> { return base_; } constexpr V base() && { return std::move(base_); } constexpr iterator begin() { return {*this, ranges::begin(base_), find_next(ranges::begin(base_))}; } constexpr auto end() { if constexpr (common_range<V>) { return iterator{*this, ranges::end(base_), {}}; } else { return sentinel{*this}; } } constexpr subrange<iterator_t<V>> find_next(iterator_t<V> it) { auto [b, e] = ranges::search(subrange(it, ranges::end(base_)), pattern_); if (b != ranges::end(base_) && ranges::empty(pattern_)) { ++b; ++e; } return {b, e}; } }; template <class R, class P> split_view2(R&&, P&&) -> split_view2<views::all_t<R>, views::all_t<P>>; template <forward_range R> split_view2(R&&, range_value_t<R>) -> split_view2<views::all_t<R>, single_view<range_value_t<R>>>; namespace views { inline constexpr __adaptor::_RangeAdaptor split2 = []<viewable_range _Range, typename _Fp>(_Range&& __r, _Fp&& __f) { return split_view2{std::forward<_Range>(__r), std::forward<_Fp>(__f)}; }; } } struct zstring_sentinel { bool operator==(char const* p) const { return *p == '\0'; } }; struct zstring : std::ranges::view_interface<zstring> { char const* p = nullptr; zstring() = default; zstring(char const* p) : p(p) { } auto begin() const { return p; } auto end() const { return zstring_sentinel{}; } }; template <typename R> concept forward_only_range = std::ranges::forward_range<R> && !std::ranges::bidirectional_range<R>; int main() { namespace rg = std::ranges; static_assert(rg::view<zstring>); { // the new one is a forward range of contiguous ranges using V = rg::split_view2<zstring, rg::single_view<char>>; static_assert(rg::view<V>); static_assert(forward_only_range<V>); static_assert(!rg::common_range<V>); static_assert(rg::contiguous_range<rg::range_reference_t<V>>); // the old one is a forward range of forward ranges using LV = rg::lazy_split_view<zstring, rg::single_view<char>>; static_assert(rg::view<LV>); static_assert(forward_only_range<LV>); static_assert(!rg::common_range<LV>); static_assert(forward_only_range<rg::range_reference_t<LV>>); } { // preserve common using V = rg::split_view2<std::string_view, std::string_view>; static_assert(forward_only_range<V>); static_assert(rg::common_range<V>); static_assert(rg::contiguous_range<rg::range_reference_t<V>>); } using namespace std::literals; fmt::print("split2\n"); fmt::print("{}\n", "a b c"sv | std::views::split2(' ')); fmt::print("{}\n", "a b c "sv | std::views::split2(' ')); fmt::print("{}\n", "abc"sv | std::views::split2(""sv)); fmt::print("{}\n", std::views::split2("xxyx"sv, "xy"sv)); fmt::print("{}\n", zstring{" x "} | std::views::split2(' ')); fmt::print("lazy_split\n"); fmt::print("{}\n", "a b c"sv | std::views::lazy_split(' ')); fmt::print("{}\n", "a b c "sv | std::views::lazy_split(' ')); fmt::print("{}\n", "abc"sv | std::views::lazy_split(""sv)); fmt::print("{}\n", std::views::lazy_split("xxyx"sv, "xy"sv)); fmt::print("{}\n", zstring{" x "} | std::views::lazy_split(' ')); }
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