std::expected表示期望,算是std::variant和std::optional的结合,它要么保留T(期望的类型),要么保留E(错误的类型),它的接口又和std::optional相似。 一个简单的例子: 这种方式无疑会简化错误处理的操作。 该特性目前在GCC 12,Clang 16(还未发布),MSVC v19.33已经实现。 4 Multidimensional Arrays(P2128) 这个特...
#include <iostream> #include <bit> int main() { unsigned short x = 258; x = std::byteswap(x); std::cout << x << endl; } 原答案:我认为你把它复杂化了,如果我们假设一个短包含 2 个字节(16 位),你需要做的就是提取高字节 hibyte = (x & 0xff00) >> 8; 提取低字节 lobyte = (...
现在存在 std::endian 但在 c++23 添加 std::byteswap 之前的 c++20 无分支版本 #include <bit> #include <type_traits> #include <concepts> #include <array> #include <cstring> #include <iostream> #include <bitset> template <int LEN, int OFF=LEN/2> class do_swap { // FOR 8 bytes: // ...
C++23 std::byteswap:反转字节 (P1272R4) C++23 std::byteswap:反转字节 (P1272R4)引言在C++编程领域,随着版本的不断迭代,新特性的引入为开发者带来了更多的便利和更强大的功能。C++23作为C++标准的一个重要版本,引入了许多新的特性和改进,其中std::byteswap就是一个备受关注的新工具。本文将深入探讨std::bytes...
_byteswap_uint64, _byteswap_ulong, _byteswap_ushort c16rtomb, c32rtomb cabs, cabsf, cabsl _cabs cacos, cacosf, cacosl cacosh, cacoshf, cacoshl _callnewh calloc _calloc_dbg carg, cargf, cargl casin, casinf, casinl casinh, casinhf, casinhl catan, catanf, catanl catanh, catanhf, ...
The portably library does not support GCC C++ pre 4.7 because the portable library does not work around C++ limitations in stdalign.h and stdint.h before GCC 4.7. This could be fixed but is not a priority. Some previously testet compiler versions may have been retired as the CI environment...
byteswap.c convert ASCII TABs to ASCII SPACEs Jul 12, 2024 byteswap.h convert ASCII TABs to ASCII SPACEs Jul 12, 2024 calc.c convert ASCII TABs to ASCII SPACEs Jul 12, 2024 calc.h convert ASCII TABs to ASCII SPACEs Jul 12, 2024 ...
42 /** * Argument values for _set_error_mode(). */#define _OUT_TO_DEFAULT 0#define _OUT_TO_STDERR 1#define _OUT_TO_MSGBOX 2#define _REPORT_ERRMODE 3 43 /** * Argument values for _set_abort_behavior(). */#define _WRITE_ABORT_MSG 0x1#define _CALL_REPORTFAULT 0x2 ...
(In Visual Studio 2017 versions 15.8 through 16.5, the compiler supports the standard C99 preprocessor via the /experimental:preprocessor compiler option.) This option is on by default when the compiler option /std:c11 or /std:c17 is specified....
(const void *, const void *));#endif __checkReturn unsigned short __cdecl _byteswap_ushort(__in unsigned short _Short); __checkReturn unsigned long __cdecl _byteswap_ulong (__in unsigned long _Long);#if _INTEGRAL_MAX_BITS >= 64 __checkReturn unsigned __int64 __cdecl _byteswap_...