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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 14.1.0
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 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 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)
M68K gcc 13.1.0
M68K gcc 13.2.0
M68K gcc 13.3.0
M68K gcc 14.1.0
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 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 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 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
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
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 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
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
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 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 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 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 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 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 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 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
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 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
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 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
x86-64 Zapcc 190308
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 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
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#include <iostream> #include <algorithm> #include <condition_variable> #include <coroutine> #include <mutex> namespace cocls { template<bool chain = false> class abstract_awaiter { public: virtual void resume() = 0; virtual ~abstract_awaiter() = default; }; template<> class abstract_awaiter<true> { public: abstract_awaiter()=default; abstract_awaiter(const abstract_awaiter &)=default; abstract_awaiter &operator=(const abstract_awaiter &)=delete; virtual ~abstract_awaiter() = default; virtual void resume() = 0; void subscribe(std::atomic<abstract_awaiter *> &chain) { while (!chain.compare_exchange_weak(_next, this, std::memory_order_relaxed)); } static void resume_chain(std::atomic<abstract_awaiter *> &chain, abstract_awaiter *skip) { abstract_awaiter *x = chain.exchange(nullptr); while (x) { auto y = x; x = x->_next; if (y != skip) y->resume(); } } abstract_awaiter<true> *_next = nullptr; protected: }; template<typename promise_type, bool chain = false> class abstract_owned_awaiter: public abstract_awaiter<chain> { public: abstract_owned_awaiter(promise_type &owner):_owner(owner) {} abstract_owned_awaiter(const abstract_owned_awaiter &) = default; abstract_owned_awaiter &operator=(const abstract_owned_awaiter &) = delete; protected: promise_type &_owner; }; template<typename promise_type> class abstract_owned_awaiter<promise_type, true>: public abstract_awaiter<true> { public: abstract_owned_awaiter(promise_type &owner):_owner(owner) {} abstract_owned_awaiter(const abstract_owned_awaiter &)=default; abstract_owned_awaiter &operator=(const abstract_owned_awaiter &)=delete; protected: promise_type &_owner; }; template<typename promise_type, bool chain = false> class co_awaiter: public abstract_owned_awaiter<promise_type, chain> { public: co_awaiter(promise_type &owner):abstract_owned_awaiter<promise_type, chain>(owner) {} bool await_ready() { return this->_owner.is_ready(); } std::coroutine_handle<> await_suspend(std::coroutine_handle<> h) { _h = h; if (this->_owner.subscribe_awaiter(this)) { return std::noop_coroutine(); } else { return h; } } auto await_resume() { return this->_owner.get_result(); } auto wait(); ///Subscribe custom awaiter /** * Allows to declare custom awaiter, which is resumed, when awaited result is ready. * @param awt reference to awaiter. You need to keep reference valid until it is called * @retval true registration done * @retval false awaiting expression is already resolved, so no registration done, you can * call await_resume() */ bool subscribe_awaiter(abstract_awaiter<> *awt) { return this->_owner.subscribe_awaiter(awt); } protected: std::coroutine_handle<> _h; virtual void resume() { _h.resume(); } }; template<typename promise_type, bool chain = false> class blocking_awaiter: public abstract_owned_awaiter<promise_type, chain> { public: blocking_awaiter(promise_type &owner):abstract_owned_awaiter<promise_type, chain>(owner) {} auto wait() { _signal = this->_owner.is_ready(); if (!_signal && this->_owner.subscribe_awaiter(this)) { std::unique_lock _(_mx); _cond.wait(_,[this]{return _signal;}); } return this->_owner.get_result(); } protected: std::mutex _mx; std::condition_variable _cond; bool _signal = false; virtual void resume() { std::unique_lock _(_mx); _signal = true; _cond.notify_all(); } }; template<typename promise_type> class callback_result { public: callback_result(promise_type &owner):_owner(owner) {} callback_result(const callback_result &owner) = default; callback_result &operator=(const callback_result &owner) = delete; auto operator()() { return _owner.get_result(); } protected: promise_type &_owner; }; template<typename Fn, typename promise_type, bool chain = false> class callback_awaiter: public abstract_owned_awaiter<promise_type, chain> { public: callback_awaiter(Fn &&callback, promise_type &owner):abstract_owned_awaiter<promise_type, chain>(owner) {} void charge() { if (!this->_owner.is_ready() && this->_owner.subscribe_awaiter(this)) { return; } _fn(callback_result<promise_type>(this->_owner)); } protected: virtual void resume() { _fn(callback_result<promise_type>(this->_owner)); } }; template<typename promise_type, bool chain> inline auto co_awaiter<promise_type, chain>::wait() { blocking_awaiter<promise_type, chain> x(this->_owner); return x.wait(); } } #include <exception> #include <variant> namespace cocls { ///Holds value or exception /** * Need to store coroutine result * * @tparam T */ template<typename T> struct value_or_exception { template<typename X> void set_value(X &&val) { _value.template emplace<T>(std::forward<X>(val)); } void unhandled_exception() { _value.template emplace<std::exception_ptr>(std::current_exception()); } std::variant<std::exception_ptr, T> _value; T &get_value() { if (_value.index() ==0) { std::exception_ptr p = std::get<0>(_value); std::rethrow_exception(p); } else { return std::get<1>(_value); } } bool is_ready() { return _value.index() == 1 || std::get<0>(_value) != nullptr; } std::exception_ptr get_exception() const { if (_value.index() != 0) return nullptr; else return std::get<0>(_value); } }; template<> struct value_or_exception<void>: public value_or_exception<bool> { void set_value() { value_or_exception<bool>::set_value(true); } void get_value() { value_or_exception<bool>::get_value(); } }; } #include <atomic> #include <cassert> #include <coroutine> #include <future> #include <optional> namespace cocls { ///Task object, it is returned from the coroutine /** * @code * task<int> cofunction() { * co_return 42; * } * @endcode * * Task is actually a kind of a smart pointer which holds the * coroutine frame even if the coroutine is already finished. You * can copy this object, or await this object. You can multiple await * at the time. Once the result is available, all waiting coroutines * are resumed */ template<typename T = void> class task; ///Coroutine promise object - part of coroutine frame /** This object is never used directly, but it is essential object to support coroutines * */ template<typename T> class task_promise; template<typename T> class task{ public: using promise_type = task_promise<T>; ///You can create empty task, which can be initialized later by assign task():_promise(nullptr) {} ///task is internaly constructed from pointer to a promise task(task_promise<T> *promise): _promise(promise) { _promise->add_ref(); } ///destruction of task decreases reference ~task() { if (_promise) _promise->release_ref(); } ///you can copy task, which just increases references task(const task &other):_promise(other._promise) { _promise->add_ref(); } ///you can move task task(task &&other):_promise(other._promise) { other._promise = nullptr; } ///you can assign task &operator=(const task &other){ if (this != &other) { if (_promise) _promise->release_ref(); _promise = other._promise; _promise->add_ref(); } return *this; } ///you can move-assign task &operator=(task &&other) { if (this != &other) { if (_promise) _promise->release_ref(); _promise = other._promise; other._promise = nullptr; } return *this; } ///task can be awaited /** * @return awaiter * * awaiting the task causes suspend of current coroutine until * the awaited task is finished */ co_awaiter<task_promise<T>,true> operator co_await() { return *_promise; } ///Determines whether task is finished and return value is ready /** * The main purpose of this function is to avoid calling costly coroutine when the * task is already finished. * * @retval true task is finished and return value is ready * @retval false task is not finished yet */ bool is_ready() const { return _promise->is_ready(); } auto join() { blocking_awaiter<task_promise<T>, true> aw(*_promise); return aw.wait(); } protected: task_promise<T> *_promise; task_promise<T> *get_promise() const {return _promise;} }; template<typename Owner> class abstract_task_awaiter { public: abstract_task_awaiter(Owner &owner):_owner(owner) {} abstract_task_awaiter(const abstract_task_awaiter &other):_owner(other._owner) { assert(next == nullptr); } abstract_task_awaiter&operator=(const abstract_task_awaiter &other) = delete; virtual ~abstract_task_awaiter() = default; virtual void resume() noexcept = 0 ; abstract_task_awaiter *get_next() { return this->next; } void push_to(std::atomic<abstract_task_awaiter<Owner> *> &list) { while (!list.compare_exchange_weak(next, this)); } protected: abstract_task_awaiter *next = nullptr; Owner &_owner; }; template<typename Owner> class task_blocking_awaiter: public abstract_task_awaiter<Owner> { public: using super_t = abstract_task_awaiter<Owner>; task_blocking_awaiter(Owner &owner): super_t(owner) {} void wait() { if (this->_owner.is_ready()) return; this->_owner.register_awaiter(this); _signal = this->_owner.is_ready(); std::unique_lock _(mx); cond.wait(_, [&]{return _signal;}); } virtual void resume() noexcept override { std::unique_lock _(mx); _signal = true; cond.notify_all(); } protected: bool _signal = false; std::mutex mx; std::condition_variable cond; }; template<typename Impl> class task_coroutine_base { public: }; template<typename T> class task_promise_base { public: task_promise_base():_ref_count(0) {} task_promise_base(const task_promise_base &) = delete; task_promise_base &operator=(const task_promise_base &) = delete; ///handles final_suspend class final_awaiter { public: final_awaiter(task_promise_base &prom): _owner(prom) {} final_awaiter(const final_awaiter &prom) = default; final_awaiter &operator=(const final_awaiter &prom) = delete; bool await_ready() noexcept { return _owner._ref_count == 0; } void await_suspend(std::coroutine_handle<>) noexcept {} constexpr void await_resume() const noexcept {} protected: task_promise_base &_owner; }; std::suspend_never initial_suspend() noexcept { ++_ref_count; return {};} final_awaiter final_suspend() noexcept { --_ref_count; return *this; } void add_ref() { _ref_count++; } void release_ref() { if (--_ref_count == 0) { task_promise<T> &me = static_cast<task_promise<T> &>(*this); auto h = std::coroutine_handle<task_promise<T> >::from_promise(me); h.destroy(); } } using AW = abstract_awaiter<true>; enum class State { not_ready, ready, processed }; value_or_exception<T> _value; std::atomic<State> _ready; std::atomic<AW *> _awaiter_chain; bool is_ready() const { return _ready != State::not_ready; } bool subscribe_awaiter(AW *aw) { aw->subscribe(_awaiter_chain); if (is_ready()) { aw->resume_chain(_awaiter_chain, aw); return false; } else { return true; } } auto get_result() { State s = State::ready; if (!_ready.compare_exchange_strong(s, State::processed)) { } return _value.get_value(); } void unhandled_exception() { _value.unhandled_exception(); this->_ready = State::ready; AW::resume_chain(this->_awaiter_chain, nullptr); } std::atomic<unsigned int> _ref_count; }; template<typename T> class task_promise: public task_promise_base<T> { public: using AW = typename task_promise_base<T>::AW; template<typename X> auto return_value(X &&val)->decltype(std::declval<value_or_exception<T> >().set_value(val)) { this->_value.set_value(std::forward<X>(val)); this->_ready = task_promise_base<T>::State::ready; AW::resume_chain(this->_awaiter_chain, nullptr); } task<T> get_return_object() { return task<T>(this); } }; template<> class task_promise<void>: public task_promise_base<void> { public: using AW = typename task_promise_base<void>::AW; auto return_void() { this->_value.set_value(); this->_ready = State::ready; AW::resume_chain(this->_awaiter_chain, nullptr); } task<void> get_return_object() { return task<void>(this); } }; } class Reporter { public: bool owned = true; Reporter() {std::cout << "Reporter created " << this << std::endl;} Reporter(const Reporter &other):owned(other.owned) {std::cout << "Reporter copied " << (&other) << " -> " << this << " " << owned << std::endl;} Reporter( Reporter &&other):owned(other.owned) {other.owned = false; std::cout << "Reporter moved " << (&other) << " -> " << this << " " << owned << std::endl;} Reporter &operator=(const Reporter &other) = delete; Reporter &operator=( Reporter &&other) = delete; ~Reporter() {std::cout << "Reporter destroyed " << this << " " << owned << std::endl;} }; cocls::task<> co2() { std::cout<< "in co2" << std::endl; co_return; } template<typename Fn> cocls::task<> test_exp(Fn &&fn) { Fn s (std::forward<Fn>(fn)); s(); return co2(); } template<typename Fn> class awaiter { public: awaiter(Fn &&fn):fn(std::forward<Fn>(fn)) {} bool await_ready() const {return false;} std::coroutine_handle<> await_suspend(std::coroutine_handle<> h) { std::cout << "In awaiter" << std::endl; std::thread thr([fn = std::move(fn),h] { std::cout << "Started thread" << std::endl; std::this_thread::sleep_for(std::chrono::seconds(1)); std::cout << "Resume" << std::endl; fn(h); }); thr.detach(); return std::noop_coroutine(); } void await_resume() {} Fn fn; }; template<typename Fn> awaiter<Fn> make_awaiter(Fn &&fn) { return awaiter<Fn>(std::forward<Fn>(fn)); } cocls::task<> co1(Reporter &&r) { co_await make_awaiter([r=std::move(r)](std::coroutine_handle<> h) { std::cout <<"in lambda" << std::endl; h.resume(); }); } int main(int argc, char **argv) { Reporter r; co1(std::move(r)).join(); return 0; }
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