std::floating_point

 

C++

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Concepts library

Core language concepts same_as derived_from convertible_to common_reference_with      common_with integral signed_integral unsigned_integral floating_point swappableswappable_with destructible constructible_from default_initializable move_constructible copy_constructible assignable_from

Comparison concepts equality_comparableequality_comparable_with totally_orderedtotally_ordered_with Object concepts movable copyable semiregular regular Callable concepts invocableregular_invocable predicate relation equivalence_relation strict_weak_order

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Defined in header <concepts>
template < class T > concept floating_point = std::is_floating_point_v<T>;		(since C++20)

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 (C++11)

checks if a type is a floating-point type (class template)