rank class

Gets number of array dimensions.

Syntax

template <class Type>
struct rank;

Template parameters

Type
The type to query.

Remarks

The type query holds the value of the number of dimensions of the array type Type, or 0 if Type is not an array type.

Example

// std__type_traits__rank.cpp
// compile with: /EHsc

#include <type_traits>
#include <iostream>

int main()
{
    std::cout << "rank<int> == "
        << std::rank<int>::value << std::endl;
    std::cout << "rank<int[5]> == "
        << std::rank<int[5]>::value << std::endl;
    std::cout << "rank<int[5][10]> == "
        << std::rank<int[5][10]>::value << std::endl;

    int single_dim_array[]{ 1, 2, 3 };
    int double_dim_array[2][1]{ { 4 }, { 5 } };

    std::cout << "\nrank<decltype(single_dim_array)> == "
        << std::rank<decltype(single_dim_array)>::value << std::endl;
    std::cout << "rank<decltype(double_dim_array)> == "
        << std::rank<decltype(double_dim_array)>::value << std::endl;
}

rank<int> == 0
rank<int[5]> == 1
rank<int[5][10]> == 2

rank<decltype(single_dim_array)> == 1
rank<decltype(double_dim_array)> == 2

Requirements

Header: <type_traits>

Namespace: std

See also

<type_traits>
extent class