std::remove_all_extents
Defined in header <type_traits>
|
||
template< class T > struct remove_all_extents; |
(since C++11) | |
If T
is a multidimensional array of some type X
, provides the member typedef type
equal to X
, otherwise type
is T
.
Member types
Name | Definition |
type
|
the type of the element of T
|
Helper types
template< class T > using remove_all_extents_t = typename remove_all_extents<T>::type; |
(since C++14) | |
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 T, std::size_t N> struct remove_all_extents<T[N]> { typedef typename remove_all_extents<T>::type type; }; |
Example
Run this code
#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); }
Possible 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) |
(C++11) |
obtains the number of dimensions of an array type (class template) |
(C++11) |
obtains the size of an array type along a specified dimension (class template) |
(C++11) |
removes one extent from the given array type (class template) |