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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 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 clang 19.1.0
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
HPPA gcc 14.2.0
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
LoongArch64 clang 19.1.0
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 19.1.0
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 19.1.0
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 19.1.0
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 19.1.0
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 clang 19.1.0
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 clang 19.1.0
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
mips64el clang 19.1.0
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 clang 19.1.0
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 (old concepts branch)
x86-64 clang (p1974)
x86-64 clang (pattern matching - P2688)
x86-64 clang (reflection)
x86-64 clang (resugar)
x86-64 clang (thephd.dev)
x86-64 clang (trunk)
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// // Copyright (c) 2018-2019 Kris Jusiak (kris at jusiak dot net) // // Distributed under the Boost Software License, Version 1.0. // (See accompanying file LICENSE_1_0.txt or copy at // http://www.boost.org/LICENSE_1_0.txt) // // #pragma once #if not defined(__cpp_variadic_templates) or \ not defined(__cpp_rvalue_references) or not defined(__cpp_decltype) or \ not defined(__cpp_alias_templates) or \ not defined(__cpp_generic_lambdas) or not defined(__cpp_constexpr) or \ not defined(__cpp_return_type_deduction) or \ not defined(__cpp_fold_expressions) or not defined(__cpp_static_assert) or \ not defined(__cpp_delegating_constructors) #error "[Boost].TE requires C++17 support" #else // #pragma GCC system_header #include <type_traits> #include <utility> #include <stdexcept> #include <memory> namespace boost { inline namespace ext { namespace te { inline namespace v1 { namespace detail { template <class...> struct type_list {}; template <class, std::size_t> struct mappings final { friend auto get(mappings); template <class T> struct set { friend auto get(mappings) { return T{}; } }; }; template <std::size_t, class...> constexpr std::size_t mappings_size_impl(...) { return {}; } template <std::size_t N, class T, class... Ts> constexpr auto mappings_size_impl(bool dummy) -> decltype(get(mappings<T, N>{}), std::size_t{}) { return 1 + mappings_size_impl<N + 1, T, Ts...>(dummy); } template <class... Ts> constexpr auto mappings_size() { return mappings_size_impl<1, Ts...>(bool{}); } template <class T, class = decltype(sizeof(T))> std::true_type is_complete_impl(bool); template <class> std::false_type is_complete_impl(...); template <class T> struct is_complete : decltype(is_complete_impl<T>(bool{})) {}; template <class T> constexpr auto requires__(bool) -> decltype(std::declval<T>().template requires__<T>()); template <class> constexpr auto requires__(...) -> void; template <class TExpr> class expr_wrapper final { static_assert(std::is_empty<TExpr>{}); public: template <class... Ts> decltype(auto) operator()(Ts &&... args) const { return reinterpret_cast<const TExpr &>(*this)(std::forward<Ts>(args)...); } }; /*! Same as std::exchange() but is guaranteed constexpr !*/ template<class T, class U> constexpr inline T exchange(T& obj, U&& new_value) noexcept( std::is_nothrow_move_constructible<T>::value && std::is_nothrow_assignable<T&, U>::value ) { T old_value = std::move(obj); obj = std::forward<U>(new_value); return old_value; } } // namespace detail struct non_owning_storage { template < class T, class T_ = std::decay_t<T>, std::enable_if_t<!std::is_same_v<T_,non_owning_storage>, bool> = true > constexpr explicit non_owning_storage(T &&t) noexcept : ptr{&t} { } void* ptr = nullptr; }; struct shared_storage { template < class T, class T_ = std::decay_t<T>, std::enable_if_t<!std::is_same_v<T_,shared_storage>, bool> = true > constexpr explicit shared_storage(T &&t) noexcept(std::is_nothrow_constructible_v<T_,T&&>) : ptr{std::make_shared<T_>(std::forward<T>(t))} { } std::shared_ptr<void> ptr; }; struct dynamic_storage { template < class T, class T_ = std::decay_t<T>, std::enable_if_t<!std::is_same_v<T_,dynamic_storage>, bool> = true > constexpr explicit dynamic_storage(T &&t) noexcept(std::is_nothrow_constructible_v<T_,T&&>) : ptr{new T_{std::forward<T>(t)}}, del{[](void *self) { delete reinterpret_cast<T_ *>(self); }}, copy{[](const void *other) -> void * { if constexpr(std::is_copy_constructible_v<T_>) return new T_{*reinterpret_cast<const T_*>(other)}; else throw std::runtime_error("dynamic_storage : erased type is not copy constructible"); }} { } constexpr dynamic_storage(const dynamic_storage& other) : ptr{other.ptr ? other.copy(other.ptr) : nullptr}, del{other.del}, copy{other.copy} { } constexpr dynamic_storage& operator=(const dynamic_storage& other) { if (other.ptr != ptr) { reset(); ptr = other.ptr ? other.copy(other.ptr) : nullptr; del = other.del; copy = other.copy; } return *this; } constexpr dynamic_storage(dynamic_storage&& other) noexcept : ptr{detail::exchange(other.ptr, nullptr)}, del{detail::exchange(other.del, nullptr)}, copy{detail::exchange(other.copy, nullptr)} { } constexpr dynamic_storage& operator=(dynamic_storage&& other) noexcept { if (other.ptr != ptr) { reset(); ptr = detail::exchange(other.ptr, nullptr); del = detail::exchange(other.del, nullptr); copy = detail::exchange(other.copy, nullptr); } return *this; } ~dynamic_storage() { reset(); } constexpr void reset() noexcept { if (ptr) del(ptr); ptr = nullptr; } void* ptr = nullptr; void (*del)(void*) = nullptr; void* (*copy)(const void*) = nullptr; }; template <std::size_t Size, std::size_t Alignment = 8> struct local_storage { using mem_t = std::aligned_storage_t<Size, Alignment>; template < class T, class T_ = std::decay_t<T>, std::enable_if_t<!std::is_same_v<T_,local_storage>, bool> = true > constexpr explicit local_storage(T &&t) noexcept(std::is_nothrow_constructible_v<T_,T&&>) : ptr{new (&data) T_{std::forward<T>(t)}}, del{[](mem_t& self) { reinterpret_cast<T_ *>(&self)->~T_(); }}, copy{[](mem_t& self, const void* other) -> void* { if constexpr(std::is_copy_constructible_v<T_>) return new (&self) T_{*reinterpret_cast<const T_ *>(other)}; else throw std::runtime_error("local_storage : erased type is not copy constructible"); }}, move{[](mem_t& self, void* other) -> void* { if constexpr(std::is_move_constructible_v<T_>) return new (&self) T_{std::move(*reinterpret_cast<T_ *>(other))}; else throw std::runtime_error("local_storage : erased type is not move constructible"); }} { static_assert(sizeof(T_) <= Size, "insufficient size"); static_assert(Alignment % alignof(T_) == 0, "bad alignment"); } constexpr local_storage(const local_storage& other) : ptr{other.ptr ? other.copy(data, other.ptr) : nullptr}, del{other.del}, copy{other.copy}, move{other.move} { } constexpr local_storage& operator=(const local_storage& other) { if (other.ptr != ptr) { reset(); ptr = other.ptr ? other.copy(data, other.ptr) : nullptr; del = other.del; copy = other.copy; move = other.move; } return *this; } constexpr local_storage(local_storage&& other) : ptr{other.ptr ? other.move(data, other.ptr) : nullptr}, del{other.del}, copy{other.copy}, move{other.move} { } constexpr local_storage& operator=(local_storage&& other) { if (other.ptr != ptr) { reset(); ptr = other.ptr ? other.move(data, other.ptr) : nullptr; del = other.del; copy = other.copy; move = other.move; } return *this; } ~local_storage() { reset(); } constexpr void reset() noexcept { if (ptr) del(data); ptr = nullptr; } mem_t data; void* ptr = nullptr; void (*del)(mem_t&) = nullptr; void* (*copy)(mem_t& mem, const void*) = nullptr; void* (*move)(mem_t& mem, void*) = nullptr; }; template <std::size_t Size, std::size_t Alignment = 8> struct sbo_storage { template<typename T_> struct type_fits : std::integral_constant<bool, sizeof(T_) <= Size && Alignment % alignof(T_) == 0>{}; using mem_t = std::aligned_storage_t<Size, Alignment>; template < class T, class T_ = std::decay_t<T>, std::enable_if_t<!std::is_same_v<T_,sbo_storage>, bool> = true, std::enable_if_t<type_fits<T_>::value, bool> = true > constexpr explicit sbo_storage(T &&t) noexcept(std::is_nothrow_constructible_v<T_,T&&>) : ptr{new (&data) T_{std::forward<T>(t)}}, del{[](mem_t& self_mem, void*) { reinterpret_cast<T_ *>(&self_mem)->~T_(); }}, copy{[](mem_t& self_mem, const void* other) -> void* { if constexpr(std::is_copy_constructible_v<T_>) return new (&self_mem) T_{*reinterpret_cast<const T_ *>(other)}; else throw std::runtime_error("sbo_storage : erased type is not copy constructible"); }}, move{[](mem_t& self_mem, void*& other) -> void* { if constexpr(std::is_move_constructible_v<T_>) return new (&self_mem) T_{std::move(*reinterpret_cast<T_ *>(other))}; else throw std::runtime_error("sbo_storage : erased type is not move constructible"); }} { } template < class T, class T_ = std::decay_t<T>, std::enable_if_t<!std::is_same_v<T_,sbo_storage>, bool> = true, std::enable_if_t<!type_fits<T_>::value, bool> = true > constexpr explicit sbo_storage(T &&t) noexcept(std::is_nothrow_constructible_v<T_,T&&>) : ptr{new T_{std::forward<T>(t)}}, del{[](mem_t&, void* self_ptr) { delete reinterpret_cast<T_ *>(self_ptr); }}, copy{[](mem_t&, const void* other) -> void* { if constexpr(std::is_copy_constructible_v<T_>) return new T_{*reinterpret_cast<const T_*>(other)}; else throw std::runtime_error("dynamic_storage : erased type is not copy constructible"); }}, move{[](mem_t&, void*& other) { return detail::exchange(other, nullptr); }} { } constexpr sbo_storage(const sbo_storage& other) : ptr{other.ptr ? other.copy(data, other.ptr) : nullptr}, del{other.del}, copy{other.copy}, move{other.move} { } constexpr sbo_storage& operator=(const sbo_storage& other) { if (other.ptr != ptr) { reset(); ptr = other.ptr ? other.copy(data, other.ptr) : nullptr; del = other.del; copy = other.copy; move = other.move; } return *this; } constexpr sbo_storage(sbo_storage&& other) : ptr{other.ptr ? other.move(data, other.ptr) : nullptr}, del{other.del}, copy{other.copy}, move{other.move} { } constexpr sbo_storage& operator=(sbo_storage&& other) { if (other.ptr != ptr) { reset(); ptr = other.ptr ? other.move(data, other.ptr) : nullptr; del = other.del; copy = other.copy; move = other.move; } return *this; } ~sbo_storage() { reset(); } constexpr void reset() noexcept { if (ptr) del(data, ptr); ptr = nullptr; } mem_t data; void* ptr = nullptr; void (*del)(mem_t&, void*) = nullptr; void* (*copy)(mem_t&, const void*) = nullptr; void* (*move)(mem_t&, void*&) = nullptr; }; class static_vtable { using ptr_t = void *; public: template <class T, std::size_t Size> explicit static_vtable(T &&, ptr_t *&vtable, std::integral_constant<std::size_t, Size>) noexcept { static ptr_t vt[Size]{}; vtable = vt; } }; namespace detail { struct poly_base { void** vptr = nullptr; virtual void* ptr() const noexcept = 0; }; } // namespace detail template < class I, class TStorage = dynamic_storage, class TVtable = static_vtable > class poly : detail::poly_base, public std::conditional_t<detail::is_complete<I>{}, I, detail::type_list<I> > { public: template < class T, class T_ = std::decay_t<T>, std::enable_if_t<!std::is_same_v<T_, poly>, bool> = true > constexpr poly(T &&t) // cppcheck-suppress noExplicitConstructor noexcept(std::is_nothrow_constructible_v<T_,T&&>) : poly{std::forward<T>(t), detail::type_list<decltype(detail::requires__<I>(bool{}))>{}} {} constexpr poly(poly const &) noexcept(std::is_nothrow_copy_constructible_v<TStorage>) = default; constexpr poly &operator=(poly const &) noexcept(std::is_nothrow_copy_constructible_v<TStorage>) = default; constexpr poly(poly &&) noexcept(std::is_nothrow_move_constructible_v<TStorage>) = default; constexpr poly &operator=(poly &&) noexcept(std::is_nothrow_move_constructible_v<TStorage>) = default; private: template < class T, class T_ = std::decay_t<T>, class TRequires > constexpr explicit poly(T &&t, const TRequires) noexcept(std::is_nothrow_constructible_v<T_,T&&>) : poly{std::forward<T>(t), std::make_index_sequence<detail::mappings_size<I>()>{}} {} template < class T, class T_ = std::decay_t<T>, std::size_t... Ns > constexpr explicit poly(T &&t, std::index_sequence<Ns...>) noexcept(std::is_nothrow_constructible_v<T_,T&&>) : detail::poly_base{}, vtable{std::forward<T>(t), vptr, std::integral_constant<std::size_t, sizeof...(Ns)>{}}, storage{std::forward<T>(t)} { static_assert(sizeof...(Ns) > 0); static_assert(std::is_destructible_v<T_>, "type must be desctructible"); static_assert(std::is_copy_constructible_v<T_> || std::is_move_constructible_v<T_>, "type must be either copyable or moveable"); (init<Ns + 1, std::decay_t<T> >( decltype(get(detail::mappings<I, Ns + 1>{})){}), ...); } template <std::size_t N, class T, class TExpr, class... TArgs> constexpr void init(detail::type_list<TExpr, TArgs...>) noexcept { vptr[N - 1] = reinterpret_cast<void *>(+[](void *self, TArgs... args) { return detail::expr_wrapper<TExpr>{}(*static_cast<T *>(self), args...); }); } void* ptr() const noexcept { if constexpr(std::is_same_v<TStorage, shared_storage>) return storage.ptr.get(); else return storage.ptr; } TStorage storage; TVtable vtable; }; namespace detail { template < class I, std::size_t N, class R, class TExpr, class... Ts > constexpr auto call_impl( const poly_base &self, std::integral_constant<std::size_t, N>, type_list<R>, const TExpr, Ts &&... args ) { void(typename mappings<I, N>::template set<type_list<TExpr, Ts...> >{}); return reinterpret_cast<R (*)(void *, Ts...)>(self.vptr[N - 1])( self.ptr(), std::forward<Ts>(args)...); } template <class I, class T, std::size_t... Ns> constexpr auto extends_impl(std::index_sequence<Ns...>) noexcept { (void(typename mappings<T, Ns + 1>::template set<decltype( get(mappings<I, Ns + 1>{}))>{}), ...); } template <class T, class TExpr, class... Ts> constexpr auto requires_impl(type_list<TExpr, Ts...>) -> decltype(&TExpr::template operator()<T, Ts...>); template <class I, class T, std::size_t... Ns> constexpr auto requires_impl(std::index_sequence<Ns...>) -> type_list< decltype(requires_impl<I>(decltype(get(mappings<T, Ns + 1>{})){}))...>; } // namespace detail template < class R = void, std::size_t N = 0, class TExpr, class I, class... Ts > constexpr auto call( const TExpr expr, const I &interface, Ts &&... args) { static_assert(std::is_empty<TExpr>{}); return detail::call_impl<I>( reinterpret_cast<const detail::poly_base &>(interface), std::integral_constant<std::size_t, detail::mappings_size<I, class call>() + 1>{}, detail::type_list<R>{}, expr, std::forward<Ts>(args)... ); } template <class I, class T> constexpr auto extends(const T &) noexcept { detail::extends_impl<I, T>( std::make_index_sequence<detail::mappings_size<I, T>()>{}); } #if defined(__cpp_concepts) template <class I, class T> concept bool var = requires { detail::requires_impl<I, T>( std::make_index_sequence<detail::mappings_size<T, I>()>{}); }; template <class I, class T> concept bool conceptify = requires { detail::requires_impl<I, T>( std::make_index_sequence<detail::mappings_size<T, I>()>{}); }; #endif } // namespace v1 } // namespace te } // namespace ext } // namespace boost #if not defined(REQUIRES) #define REQUIRES(R, name, ...) \ R { \ return ::te::call<R>( \ [](auto&& self, auto&&... args) -> decltype( \ self.name(std::forward<decltype(args)>(args)...)) { \ return self.name(std::forward<decltype(args)>(args)...); \ }, \ *this, ##__VA_ARGS__); \ } #endif #endif #include <sstream> #include <cassert> namespace te = boost::te; template <class T> struct DrawableT { void draw(T &out) const { te::call([](auto const &self, T &out) { self.draw(out); }, *this, out); } }; template struct DrawableT<std::ostream>; template struct DrawableT<std::stringstream>; struct Square { void draw(std::ostream &out) const { out << "Square"; } }; struct Circle { void draw(std::ostream &out) const { out << "Circle"; } }; int main() { { std::stringstream str{}; te::poly<DrawableT<std::ostream>> drawable{Square{}}; drawable.draw(str); assert("Square" == str.str()); } { std::stringstream str{}; te::poly<DrawableT<std::stringstream>> drawable{Circle{}}; drawable.draw(str); assert("Circle" == str.str()); }; }
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