extent Class

Gets an array dimension.

template<class Ty, unsigned I = 0>
    struct extent;

Parameters

• Ty
  The type to query.

• I
  The array bound to query.

Remarks

If Ty is an array type that has at least I dimensions, the type query holds the number of elements in the dimension specified by I. If Ty is not an array type or its rank is less than I, or if I is zero and Ty is of type "array of unknown bound of U", the type query holds the value 0.

Example

// std_tr1__type_traits__extent.cpp 
// compile with: /EHsc 
#include <type_traits> 
#include <iostream> 
 
int main() 
    { 
    std::cout << "extent 0 == " 
        << std::extent<int[5][10]>::value << std::endl; 
    std::cout << "extent 1 == " 
        << std::extent<int[5][10], 1>::value << std::endl; 
 
    return (0); 
    } 
 

extent 0 == 5
extent 1 == 10

Requirements

Header: <type_traits>

Namespace: std

See Also

Reference

<type_traits>

remove_all_extents Class

remove_extent Class

Other Resources

<type_traits> Members