1. const 并非常量表达式(而C23其后推出constexpr才特指常量表达式):作为"类型修饰符(限定符)",const关键字的引入源于 C++. 这在 cppreference 有提及.但与 C++ 不同, C 语言中具有被const修饰类型的表达式, 并非常量表达式.图片引用于 cppreference:此外, 在 C Standard 的"词元"章节对"常
原因：以下3行输出内容相同：constexprconstinta[2]={114514,1919810};printf("%p\r\n",a);printf(...
} 可以使用const,constexpr使case合法 constexprintY =10;// 编译时已知的常量switch(x) {caseY:// ✅ 合法,因为 Y 是编译时常量break; } 注:switch语句中,满足condition对应的结果的case标签(eg:condition为x-y,正好此时结果为1则执行case 1),当不遇到break就会顺着case标签一直执行下去,直到遇到break或者sw...
int constexpr() {return 1;} 可移动类型不能为常量 当函数返回预期要移动的类型时,其返回类型不得为 const。 已删除复制构造函数 下面的代码现在生成错误 C2280:"S::S(S &&)":正在尝试引用已删除的函数。 C++ 复制 struct S{ S(int, int); S(const S&) = delete; S(S&&) = delete; }; S...
A reinterpret_cast is illegal in a constexpr function. The Microsoft C++ compiler would previously reject reinterpret_cast only if it were used in a constexpr context. In Visual Studio 2019, in all language standards modes, the compiler correctly diagnoses a reinterpret_cast in the definition of...
int constexpr() {return 1;} Movable types can't be const When a function returns a type that's intended to be moved, its return type should not be const. Deleted copy constructors The following code now produces C2280 'S::S(S &&)': attempting to reference a deleted function: C++...
int constexpr() {return 1;} Movable types can't be const When a function returns a type that's intended to be moved, its return type should not be const. Deleted copy constructors The following code now produces C2280 'S::S(S &&)': attempting to reference a deleted function: C++...
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fixed-containers - Header-only C++20 library that provides fixed capacity constexpr containers. [MIT] flat_hash_map - A very fast flat hashtable with Fibonacci hashing. frozen - a header-only, constexpr alternative to gperf for C++14 users. [Apache-2.0] Hashmaps - Implementation of open ad...
For the header-only (and constexpr in C++20 or higher) version, add theUNI_ALGO_STATIC_DATAdefine to your project and ignore thesrc/data.cppfile. Testing Note that test is a CMake project, not a subproject, so you need to do it like this: ...