然后烦人的Clang就会给你一个讨厌的Wvla警告,这还算好的,换成MSVC的话编译都过不了。可是我真的没有想用VLA啊,static变量的初始化器必须是常量表达式,而const意味着n不可修改,所以n是一个“事实上的编译时常量”,可惜n没有常量的名分,因此不能把它当成常量来用。有人可能会说:你用#define n 624不就好了嘛...
比如, 在 msvc 中, 可以用 const修饰的对象, 作为 size 来声明非 VLA 数组(C 标准的约束违例). 而通过使用 constexpr存储类说明符, 编程者可明确"常量表达式"(这在 C11 标准中是做不到的). constexpr明确通知编译器(实现), 对象应在转译时演算(而非运行时), 尽管这可能原本已经是编译器的自行实现. ...
属性（attribute）在C中是一种机制，允许开发者用通用语法给语言实体附加额外信息，以供编译器优化编译输出或指定特定平台行为。属性既可包含编译器自定义信息（在厂商属性空间），也可用标准规定的属性。属性一般置于声明或语句开始，其他语法结构之前。C++的属性设计旨在通用性，MSVC的__declspec和GNU的__at...
MSVC 的 __declspec 和GNU 的 __attribute__ 都考虑过,但是 __declspec 属性只适合声明,而不适合比如语句之类的其他语法;__attribute__ 适用范围更广,但是有歧义(比如 void f(int (__attribute__((foo)) x));)。 属性在各种语法里的位置是 WG21(C++ 的工作组)决定的,为了消除歧义并保持设计一致。属性...
MSVC Apple Clang EDG eccp Intel C++ Nvidia HPC C++ (ex PGI)* Nvidia nvcc Cray [Collapse] static_assertwith no messageN226599YesYes6.52021.1.2 (clang based) [[nodiscard]]N2267109Yes6.42021.1.2 (clang based) [[maybe_unused]]N2270109Yes6.42021.1.2 (clang based) ...
C语言虽然目前没有完全采用C++的属性，但已有C++编译器支持，如MSVC、GCC和Clang。为了保持一致性，属性通常放置在声明和语句的开头。C++的属性支持自定义和标准规定，编译器厂商可以扩展属性空间，如Clang和GCC分别有自己的特定属性。Objective-C和Objective-C++通过特殊方式处理属性，以避免与C++的冲突。建议...
MSVC build instructions Open the Developer Command Prompt of visual studio. Go to thesrcdirectory and type This will buildcake.exe, then run cake on its own source code. GCC on Linux build instructions Got to thesrcdirectory and type: ...
This suggestion ticket is used to track and measure the C++ and MSVC communities’ interest in the C++23 Standard implementation. Please add your vote and let us know (in the comments below) what specific features are of most interest to you. Please note, ...
In preparation for Pure Virtual C++ tomorrow Stephan T. Lavavej has made a video update of all we’ve been working on for conformance in MSVC for C++20 and C++23.You can sign up for Pure Virtual C++ for free here.Stephan’s video is here:...
In a more practical sense, we should probably consider it sometimes 2 to 4 years after the last major compiler has support for it, which will be MSVC (given that clang 19.1 has now been released, and gcc 15 should likely be released somewhere april/may 2025), where there is no announced...