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std::is_floating_point

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integral_constant(C++11)
 
Defined in header <type_traits>
template< class T >
struct is_floating_point;
 (a partir do C++ 11)
Se T é um tipo de ponto flutuante (float, double, long double, incluindo as variantes cv-qualificados), fornece o membro constante value true igual. Para qualquer outro tipo, é value false.
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If T is a floating-point type (float, double, long double, including any cv-qualified variants), provides the member constant value equal true. For any other type, value is false.
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Índice

Inherited from std::integral_constant

Member constants

value
[estática]
true se T is a floating-point type , false contrário
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true if T is a floating-point type , false otherwise
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(membro estático público constante)

Member functions

operator bool
converte o objeto em bool, retorna value
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converts the object to bool, returns value
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(função pública membro)

Member types

Tipo
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Type
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 Definition
value_type bool
type std::integral_constant<bool, value>

[editar] Possível implementação

template< class T >
struct is_floating_point : std::integral_constant<
                               bool,
                               std::is_same<float, typename std::remove_cv<T>::type>::value  ||
                               std::is_same<double, typename std::remove_cv<T>::type>::value  ||
                               std::is_same<long double, typename std::remove_cv<T>::type>::value
                           > {};

[editar] Exemplo

#include <iostream>
#include <type_traits>
 
class A {};
 
int main() 
{
    std::cout << std::boolalpha;
    std::cout << std::is_floating_point<A>::value << '\n';
    std::cout << std::is_floating_point<float>::value << '\n';
    std::cout << std::is_floating_point<int>::value << '\n';
}

Output: 

false
true
false

[editar] Veja também

[estática]
identifica os IEC 559/IEEE 754 tipos de ponto flutuante
Original:
identifies the IEC 559/IEEE 754 floating-point types
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(of std::numeric_limits membro estático público constante) [edit]
(C++11)
verifica se um tipo é tipo integral
Original:
checks if a type is integral type
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(modelo de classe) [edit]
(C++11)
verifica se um tipo é o tipo de aritmética
Original:
checks if a type is arithmetic type
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(modelo de classe) [edit]
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