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c++ source #1
Output
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Execute the code
Intel asm syntax
Demangle identifiers
Filters
Unused labels
Library functions
Directives
Comments
Horizontal whitespace
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 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 commander X16
llvm-mos commodore 64
llvm-mos mega65
llvm-mos nes-cnrom
llvm-mos nes-mmc1
llvm-mos nes-mmc3
llvm-mos nes-nrom
llvm-mos osi-c1p
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 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
x86-64 gcc 5.1
x86-64 gcc 5.2
x86-64 gcc 5.3
x86-64 gcc 5.4
x86-64 gcc 5.5
x86-64 gcc 6.1
x86-64 gcc 6.2
x86-64 gcc 6.3
x86-64 gcc 6.4
x86-64 gcc 7.1
x86-64 gcc 7.2
x86-64 gcc 7.3
x86-64 gcc 7.4
x86-64 gcc 7.5
x86-64 gcc 8.1
x86-64 gcc 8.2
x86-64 gcc 8.3
x86-64 gcc 8.4
x86-64 gcc 8.5
x86-64 gcc 9.1
x86-64 gcc 9.2
x86-64 gcc 9.3
x86-64 gcc 9.4
x86-64 gcc 9.5
x86-64 icc 13.0.1
x86-64 icc 16.0.3
x86-64 icc 17.0.0
x86-64 icc 18.0.0
x86-64 icc 19.0.0
x86-64 icc 19.0.1
x86-64 icc 2021.1.2
x86-64 icc 2021.10.0
x86-64 icc 2021.2.0
x86-64 icc 2021.3.0
x86-64 icc 2021.4.0
x86-64 icc 2021.5.0
x86-64 icc 2021.6.0
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#include <string_view> #include <tuple> #include <utility> #include <type_traits> struct PropAttribs { // Attributes that can be attached to props. I'm defining example stub // attributes here, it's useful to have a 'builder style' to have the syntax // work out like in the example at the bottom. PropAttribs &uiStyle(const char *) { return *this; } PropAttribs &min(int) { return *this; } PropAttribs &max(int) { return *this; } }; template<typename Value, typename Internal> struct Prop { // Tracks a prop's value, name and attributes. This type is usually not meant to be instantiated // directly, with normal use being through the `PROP` macro. // // The name is a compile time constant, and the hash of the name is also computed at compile time. // This helps with fast lookups. template<typename Value_ = Value, typename std::enable_if<!std::is_aggregate_v<Value_>, int>::type = 0, typename... Args> Prop(Args &&...args) // NOLINT(google-explicit-constructor) : value(std::forward<Args>(args)...) { } template<typename Value_ = Value, typename std::enable_if<std::is_aggregate_v<Value_>, int>::type = 0, typename... Args> Prop(Args &&...args) // NOLINT(google-explicit-constructor) : value { std::forward<Args>(args)... } { } Value &operator()() { return value; } const Value &operator()() const { return value; } static constexpr std::string_view name = Internal::name; inline static const PropAttribs &attribs = Internal::attribs; private: Value value; }; // Macro for defining a reflectable prop in a struct. Examples: // // struct Foo { // PROP(int, health) = 32; // `int` prop named `health` with default value `32` // PROP(std::vector<int>, vec); // No default value, invokes default constructor (empty) // PROP(std::string, space) = "place"; // PROP((std::pair<int, int>), aPair) = { 1, 2 }; // Need extra parens if the type has commas // // int nope = 42; // This is a regular untracked field // }; // // The result is a member with that name of type `Prop<type, someInternals>`. You can then use the // members of that type to query information about the prop. To continue with the `Foo` example from // above: // // Foo thing; // print("{} is: {}", thing.health.name, thing.health()); // thing.aPair().first = 7; // // `PROP_NAMED` can be used to explicitly specify a different name string for reflection. This is // useful if the string desired collides with a C++ keyword: // // PROP_NAMED("else", ElseBranch, else_) = nullptr; #define PROP(type, name_, ...) PROP_NAMED(#name_, type, name_, __VA_ARGS__) #define PROP_NAMED(nameStr, type, name_, ...) \ private: \ struct INTERNAL_##name_ { \ static constexpr std::string_view name = nameStr; \ inline static PropAttribs attribs = PropAttribs() __VA_ARGS__; \ }; \ \ public: \ Prop<PROP_PARENS_1(PROP_PARENS_3 type), INTERNAL_##name_> name_ #define PROP_PARENS_1(...) PROP_PARENS_2(__VA_ARGS__) #define PROP_PARENS_2(...) NO##__VA_ARGS__ #define PROP_PARENS_3(...) PROP_PARENS_3 __VA_ARGS__ #define NOPROP_PARENS_3 // Whether `T` is itself a prop or a (possibly const) reference to one template<typename T> inline constexpr auto isProp = false; template<typename... Params> inline constexpr auto isProp<Prop<Params...>> = true; template<typename... Params> inline constexpr auto isProp<Prop<Params...> &> = true; template<typename... Params> inline constexpr auto isProp<const Prop<Params...> &> = true; // Whether we can reflect `T` to look for fields inside template<typename T> inline constexpr auto isReflectable = std::is_aggregate_v<T> &&std::is_standard_layout_v<T> && !std::is_polymorphic_v<T>; template<typename T> inline constexpr auto isReflectable<T &> = isReflectable<T>; template<typename T> inline constexpr auto isReflectable<const T &> = isReflectable<T>; // Get a tuple of references to fields (whether prop or not) of a reflectable. From: // https://github.com/felixguendling/cista/tree/83c760166dd8dc069ad939143011e0921ccb5acd/include/cista/reflection struct CanConvertToAnything { template<typename Type> operator Type() const; // NOLINT(google-explicit-constructor) }; template<typename Aggregate, typename IndexSequence = std::index_sequence<>, typename = void> struct countReflectableFieldsImpl : IndexSequence {}; template<typename Aggregate, size_t... Indices> struct countReflectableFieldsImpl<Aggregate, std::index_sequence<Indices...>, std::void_t<decltype( Aggregate { (static_cast<void>(Indices), std::declval<CanConvertToAnything>())..., std::declval<CanConvertToAnything>() })>> : countReflectableFieldsImpl<Aggregate, std::index_sequence<Indices..., sizeof...(Indices)>> {}; template<typename T> constexpr size_t countReflectableFields() { return countReflectableFieldsImpl<std::remove_cv_t<std::remove_reference_t<T>>>().size(); } template<typename T> inline auto reflectableToTuple(T &val) { constexpr auto n = countReflectableFields<T>(); static_assert(n <= 24, "toTuple: only up to 24 fields supported -- implementation pattern can be extended for more"); if constexpr (n == 0) { return std::tie(); } else if constexpr (n == 1) { auto &[a] = val; return std::tie(a); } else if constexpr (n == 2) { auto &[a, b] = val; return std::tie(a, b); } else if constexpr (n == 3) { auto &[a, b, c] = val; return std::tie(a, b, c); } else if constexpr (n == 4) { auto &[a, b, c, d] = val; return std::tie(a, b, c, d); } else if constexpr (n == 5) { auto &[a, b, c, d, e] = val; return std::tie(a, b, c, d, e); } else if constexpr (n == 6) { auto &[a, b, c, d, e, f] = val; return std::tie(a, b, c, d, e, f); } else if constexpr (n == 7) { auto &[a, b, c, d, e, f, g] = val; return std::tie(a, b, c, d, e, f, g); } else if constexpr (n == 8) { auto &[a, b, c, d, e, f, g, h] = val; return std::tie(a, b, c, d, e, f, g, h); } else if constexpr (n == 9) { auto &[a, b, c, d, e, f, g, h, i] = val; return std::tie(a, b, c, d, e, f, g, h, i); } else if constexpr (n == 10) { auto &[a, b, c, d, e, f, g, h, i, j] = val; return std::tie(a, b, c, d, e, f, g, h, i, j); } else if constexpr (n == 11) { auto &[a, b, c, d, e, f, g, h, i, j, k] = val; return std::tie(a, b, c, d, e, f, g, h, i, j, k); } else if constexpr (n == 12) { auto &[a, b, c, d, e, f, g, h, i, j, k, l] = val; return std::tie(a, b, c, d, e, f, g, h, i, j, k, l); } else if constexpr (n == 13) { auto &[a, b, c, d, e, f, g, h, i, j, k, l, m] = val; return std::tie(a, b, c, d, e, f, g, h, i, j, k, l, m); } else if constexpr (n == 14) { auto &[a, b, c, d, e, f, g, h, i, j, k, l, m, n] = val; return std::tie(a, b, c, d, e, f, g, h, i, j, k, l, m, n); } else if constexpr (n == 15) { auto &[a, b, c, d, e, f, g, h, i, j, k, l, m, n, o] = val; return std::tie(a, b, c, d, e, f, g, h, i, j, k, l, m, n, o); } else if constexpr (n == 16) { auto &[a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p] = val; return std::tie(a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p); } else if constexpr (n == 17) { auto &[a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q] = val; return std::tie(a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q); } else if constexpr (n == 18) { auto &[a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r] = val; return std::tie(a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r); } else if constexpr (n == 19) { auto &[a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s] = val; return std::tie(a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s); } else if constexpr (n == 20) { auto &[a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t] = val; return std::tie(a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t); } else if constexpr (n == 21) { auto &[a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u] = val; return std::tie(a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u); } else if constexpr (n == 22) { auto &[a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v] = val; return std::tie(a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v); } else if constexpr (n == 23) { auto &[a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w] = val; return std::tie(a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w); } else if constexpr (n == 24) { auto &[a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x] = val; return std::tie(a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x); } } // Whether `T` has at least one prop member template<typename T = int, typename... Vs> inline constexpr auto isAnyProp = isProp<T> || isAnyProp<Vs...>; template<typename T> inline constexpr auto isAnyProp<T> = isProp<T>; template<typename T> inline constexpr auto isAnyTupleElementProp = false; template<typename... Ts> inline constexpr auto isAnyTupleElementProp<std::tuple<Ts...>> = isAnyProp<Ts...>; template<typename T> constexpr auto hasProps = isReflectable<T> &&isAnyTupleElementProp<decltype(reflectableToTuple(std::declval<T &>()))>; // Iterate through all the props of a struct. This expands to all the props at compile time, with // the function `F` being invoked with each prop (of type `Prop<...>`). // // For example, the following code prints each prop name and value in a struct. Here `prop()` (the // value of the prop) has different types on each 'iteration', depending on which prop is being // referenced: // // forEachProp(aStruct, [&]<typename P>(P &prop) { // print("{}: {}", P::name, prop()); // Print each prop name and value // }) template<typename Struct, typename F> void forEachProp(Struct &s, F &&f) { static_assert(isReflectable<Struct>, "forEachProp: this type is not reflectable"); if constexpr (hasProps<Struct>) { const auto visitField = [&](auto &field) { if constexpr (isProp<decltype(field)>) { f(field); } }; std::apply( [&](auto &&...args) { (visitField(args), ...); }, reflectableToTuple(s)); } } // // Example // #include <vector> #include <cstdio> #include <string> struct Person { PROP(int, age) = 3; PROP(std::string, name) = "baby"; struct Item { PROP(double, value) = 42; }; PROP(std::vector<Item>, items); PROP(double, health, .uiStyle("slider").min(0).max(100)) = 90; int hidden = 1337; }; static void describe(int &i) { std::printf("%d", i); } static void describe(double &d) { std::printf("%f", d); } static void describe(std::string &s) { std::printf("%s", s.c_str()); } template<typename T> static void describe(std::vector<T> &v) { std::printf("\n"); for (auto &e : v) { describe(e); } } template<typename T> static void describe(T &value) { forEachProp(value, [&]<typename P>(P &prop) { std::printf("%s: ", P::name.data()); describe(prop()); std::printf("\n"); }); } int main() { Person example; example.items().push_back({ 100 }); describe(example); return 0; }
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