std::regular
Defined in header <concepts> |
||
|---|---|---|
template <class T> concept regular = std::semiregular<T> && std::equality_comparable<T>; |
(since C++20) |
The regular concept specifies that a type is regular, that is, it is copyable, default constructible, and equality comparable. It is satisfied by types that behave similarly to built-in types like int, and that are comparable with ==.
Example
#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';
}
Output:
Equal 4 4
See also
|
(C++20)
|
specifies that an object of a type can be copied, moved, swapped, and default constructed (concept) |
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https://en.cppreference.com/w/cpp/concepts/regular
