std::same_as

Since C++20

Header: <concepts>

The concept same_as<T, U> is satisfied if and only if T and U denote the same type.

# Declarations

template< class T, class U >
concept same_as = /* see below */;

(since C++20)

# Example

#include <concepts>
#include <iostream>
 
template<typename T, typename ... U>
concept IsAnyOf = (std::same_as<T, U> || ...);
 
template<typename T>
concept IsPrintable = std::integral<T> || std::floating_point<T> ||
    IsAnyOf<std::remove_cvref_t<std::remove_pointer_t<std::decay_t<T>>>, char, wchar_t>;
 
void println(IsPrintable auto const ... arguments)
{
    (std::wcout << ... << arguments) << '\n';
}
 
int main()
{
    println("Example: ", 3.14, " : ", 42, " : [", 'a', L'-', L"Z]");
}

# See also