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std::remove_all_extents

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Revision as of 14:12, 2 November 2012 by P12bot (Talk | contribs)

 
 
 
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Template:ddcl list begin <tr class="t-dsc-header">

<td>
Defined in header <type_traits>
</td>

<td></td> <td></td> <tr class="t-dcl ">

<td >
template< class T >
struct remove_all_extents;
</td>

<td class="t-dcl-nopad"> </td> <td > (since C++11) </td> </tr> Template:ddcl list end

If T is a multidimensional array of some type X, provides the member typedef type equal to X, otherwise type is T.

Contents

Member types

Name Definition
type the type of the element of T

Possible implementation

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;
};

Example

#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

See also

(C++11)
checks if a type is an array type
(class template) [edit]
(C++11)
obtains the number of dimensions of an array type
(class template) [edit]
(C++11)
obtains the size of an array type along a specified dimension
(class template) [edit]
removes one extent from the given array type
(class template) [edit]