std::regular
来自cppreference.com
| 定义于头文件 <concepts>
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| template <class T> concept regular = std::semiregular<T> && std::equality_comparable<T>; |
(C++20 起) | |
regular 概念指定类型为正则，即它可复制、可默认构造且可比较相等。表现类似如 int 的内建类型，且能以 == 比较的类型满足它。
示例
运行此代码
#include <concepts> #include <iostream> template<std::regular T> struct Single { T value; friend bool operator==(const Single&, const Single&) = default; }; int main() { Single<int> myInt1{4}; Single<int> myInt2; myInt2 = myInt1; if (myInt1 == myInt2) std::cout << "Equal\n"; std::cout << myInt1.value << ' ' << myInt2.value << '\n'; }
输出：
Equal 4 4
