std::floating_point(3)

NAME
std::floating_point - std::floating_point

Synopsis
   Defined in header <concepts>
   template < class T > (since C++20)
   concept floating_point = std::is_floating_point_v<T>;
   The concept floating_point<T> is satisfied if and only if T is a floating-point
   type.

Example
// Run this code
 #include <concepts>
 #include <iostream>
 #include <type_traits>
 constexpr std::floating_point auto x2(std::floating_point auto x) {
     return x + x;
 }
 constexpr std::integral auto x2(std::integral auto x) {
     return x << 1;
 }
 int main() {
     constexpr auto d = x2(1.1);
     static_assert(std::is_same_v<double const, decltype(d)>);
     std::cout << d << '\n';
     constexpr auto f = x2(2.2f);
     static_assert(std::is_same_v<float const, decltype(f)>);
     std::cout << f << '\n';
     constexpr auto i = x2(444);
     static_assert(std::is_same_v<int const, decltype(i)>);
     std::cout << i << '\n';
 }

Output:
 2.2
 4.4
 888

See also
   is_floating_point checks if a type is a floating-point type
   (C++11) (class template)