extent Class


For the latest documentation on Visual Studio 2017 RC, see Visual Studio 2017 RC Documentation.

Gets an array dimension.

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


The type to query.

The array bound to query.

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.

// 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  

Header: <type_traits>

Namespace: std

remove_all_extents Class
remove_extent Class