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Difference between revisions of "cpp/types/rank"

From cppreference.com
< cpp‎ | types
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===Example===
 
===Example===
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Revision as of 18:01, 19 April 2012

Template:cpp/types/sidebar Template:ddcl list begin <tr class="t-dsc-header">

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

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

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

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

If T is an array type, provides the member constant value equal to the number of dimensions of the array. For any other type, value is 0.

Contents

Inherited from std::integral_constant

Member constants

value
[static]
 the number of dimensions of T or zero
(public static member constant)

Member functions

operator std::size_t
 converts the object to std::size_t, returns value
(public member function)
operator()
(C++14)
 returns value
(public member function)

Member types

Type Definition
value_type std::size_t
type std::integral_constant<std::size_t, value>

Possible implementation

Template:eq fun cpp

Example

Run this code
#include <iostream>
#include <type_traits>
 
int main()
{
    std::cout << std::rank<int[1][2][3]>::value << '\n';
    std::cout << std::rank<int[][2][3][4]>::value << '\n';
    std::cout << std::rank<int>::value << '\n';
}

Output: 

3
4
0

See also

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