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 = (...
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::byteswap的相关内容,包括其基本概念、功能、使用场...
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: // ...
In /std:c++17 mode, MSVC now conforms to the Standard by giving throw() the same behavior as noexcept, that is, enforcement via termination.The compiler option /Zc:noexceptTypes requests the old behavior of __declspec(nothrow). It's likely that throw() will be removed in a future ...
_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, ...
(void) fprintf(stderr, gettext("filesystem '%s' mount "10 changes: 5 additions & 5 deletions 10 cmd/raidz_test/raidz_bench.c Original file line numberDiff line numberDiff line change @@ -93,7 +93,7 @@ run_gen_bench_impl(const char *impl) start = gethrtime(); for (iter = ...
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...
P0298R3 std::byte VS 2017 15.3 17, J P0302R1 Removing Allocator Support In std::function VS 2017 15.5 17 P0307R2 Making Optional Greater Equal Again VS 2017 15.0 P0393R3 Making Variant Greater Equal VS 2017 15.0 P0403R1 UDLs For <string_view> ("meow"sv, etc.) ...
P0298R3 std::byte VS 2017 15.3 17, J P0302R1 Removing Allocator Support In std::function VS 2017 15.5 17 P0307R2 Making Optional Greater Equal Again VS 2017 15.0 P0393R3 Making Variant Greater Equal VS 2017 15.0 P0403R1 UDLs For <string_view> ("meow"sv, etc.) ...