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std::rank

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C++
 
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支援を入力します (basic types, RTTI, type traits)
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initializer_list(C++11)
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rank(C++11)
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integral_constant(C++11)
 
Defined in header <type_traits>
template< class T >
struct rank;
 (C + + 11以来)

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.

目次

Inherited from std::integral_constant

Member constants

value
[静的]
 the number of dimensions of T or zero
(公共の静的メンバ定数)

Member functions

operator std::size_t
std::size_tにオブジェクトは、value返しに変換します
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converts the object to std::size_t, returns value
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(パブリックメンバ関数)

Member types

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

[編集] 可能な実装

template<class T>
struct rank : std::integral_constant<std::size_t, 0> {};
 
template<class T>
struct rank<T[]> : public std::integral_constant<std::size_t, rank<T>::value + 1> {};
 
template<class T, size_t N>
struct rank<T[N]> : public std::integral_constant<std::size_t, rank<T>::value + 1> {};

[編集] 例

#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

[編集] も参照してください

(C++11)
タイプかどうかをチェックするには、配列型です
Original:
checks if a type is an array type
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(クラステンプレート) [edit]
(C++11)
指定された次元に沿って配列型のサイズを取得します
Original:
obtains the size of an array type along a specified dimension
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(クラステンプレート) [edit]
(C++11)
指定された配列型から1エクステントを削除します
Original:
removes one extent from the given array type
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(クラステンプレート) [edit]
(C++11)
 removes all extents from the given array type
(クラステンプレート) [edit]
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