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std::remove_all_extents

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Defined in header <type_traits>
template< class T >
struct remove_all_extents;
(a partir do C++ 11)
Se T é uma matriz multidimensional de algum tipo X, fornece o membro typedef type igual a X, caso contrário, é type T.
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If T is a multidimensional array of some type X, provides the member typedef type equal to X, otherwise type is T.
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Índice

[editar] Tipos de membro

Nome
Original:
Name
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Definition
type
o tipo do elemento de T
Original:
the type of the element of T
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[editar] Possível implementação

template<class T>
struct remove_all_extents { typedef T type;};
 
template<class T>
struct remove_all_extents<T[]> {
    typedef typename remove_all_extents<T>::type type;
};
 
template<class Tp, std::size_t N>
struct remove_all_extents<T[N]> {
    typedef typename remove_all_extents<T>::type type;
};

[editar] Exemplo

#include <iostream>
#include <type_traits>
#include <typeinfo>
 
template<class A>
void foo(const A&)
{
    typedef typename std::remove_all_extents<A>::type Type;
    std::cout << "underlying type: " << typeid(Type).name() << '\n';
}
 
int main()
{
    float a1[1][2][3];
    int a2[3][2];
    float a3[1][1][1][1][2];
    double a4[2][3];
 
    foo(a1);
    foo(a2);
    foo(a3);
    foo(a4);
}

Output:

underlying type: f
underlying type: i
underlying type: f
underlying type: d

[editar] Veja também

(C++11)
verifica se o tipo é um tipo de matriz
Original:
checks if a type is an array type
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(modelo de classe) [edit]
(C++11)
obtém o número de dimensões de um tipo de matriz
Original:
obtains the number of dimensions of an array type
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(modelo de classe) [edit]
(C++11)
obtém o tamanho de um tipo de matriz ao longo de uma dimensão especificada
Original:
obtains the size of an array type along a specified dimension
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(modelo de classe) [edit]
remove uma medida do tipo matriz dada
Original:
removes one extent from the given array type
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(modelo de classe) [edit]