std::regular
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