(std::to_underlying(E2::e))>); enum E3 : unsigned { e }; static_assert(std::is_same_v<unsigned, decltype(std::to_underlying(e))>); int main() { enum class ColorMask : std::uint32_t { red = 0xFF, green = (red <<
std::to_underlying 在C++23 中,函数std::to_underlying将枚举类型enum转换为其基础类型。这个函数是一个便利函数,其表达式为static_cast<std::underlying_type<Enum>::type>(enum),使用了类型特征函数std::underlying_type。 enumclassColor{RED,GREEN,BLUE};Colorc=Color::RED;std::underlying_type_t<Color>cu...
See also is_enum (C++11) checks if a type is an enumeration type (class template) is_scoped_enum (C++23) checks if a type is a scoped enumeration type (class template) to_underlying (C++23) converts an enumeration to its underlying type (function template) ...
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data: direct access to the underlying contiguous storage,直接访问底层连续存储空间。 //main.cc file #include <array> #include<assert.h> int main() { std::array<int, 3> a0 = {1, 2, 1}; assert(a0.front() == a0.back());
The underlying bug here is that __is_trivially_copyable(std::pair<X&, Y&>) (and variations) should return false, without making it false for other variations of std::pair<X,Y> which actually are trivially copyable.C++web View timeline by All Posts (6) Solutions & workarounds...
When working with std::vector, it’s crucial to understand the distinction between its size and its capacity, as well as how the container manages its underlying memory. Let’s dive into these concepts and their real-world performance implications. ...
The underlying NT status code is STATUS_FILE_IS_A_DIRECTORY but that gets mapped to the Win32 error ERROR_ACCESS_DENIED by CreateFileW. fmeaseadded O-windowsOperating system: Windows C-bugCategory: This is a bug. A-ioArea: `std::io`, `std::fs`, `std::net` and `std::path` ne...
if you're seeing repeated warnings or errors coming from your web server's stderr stream, this could indicate an underlying problem that needs attention. in many cases this will require digging deeper into log files, reviewing configuration settings within application/server settings menus etc., ...
在这些改进中,我们见证了从 C++17、C++20 到 C++23 中对 enum class 功能的修改和扩展。在这篇文章中,我们将探讨这些进展,重点介绍 C++17 中的初始化改进、C++20 中引入的 using enum 关键字,以及 C++23 中的 std::to_underlying 实用工具。 enum class 简介...