| Defined in header <type_traits> | ||||
|---|---|---|---|---|
| (since C++11) |
If T is an array of some type X, provides the member typedef type equal to X, otherwise type is T. Note that if T is a multidimensional array, only the first dimension is removed.
Member types
| Name | Definition |
|---|---|
type | the type of the element of T |
Helper types
| (since C++14) |
Possible implementation
|
Example
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 | #include <iostream>#include <iterator>#include <algorithm>#include <type_traits> template<class A>typename std::enable_if< std::rank<A>::value == 1 >::typeprint_1d(const A& a){ copy(a, a+std::extent<A>::value, std::ostream_iterator<typename std::remove_extent<A>::type>(std::cout, " ")); std::cout << '\n';} int main(){ int a[][3] = {{1,2,3},{4,5,6}};// print_1d(a); // compile-time error print_1d(a[1]);} |
Output:
1 | 4 5 6 |
See also
| (C++11) | checks if a type is an array type (class template) |
| (C++11) | obtains the number of dimensions of an array type (class template) |
| (C++11) | obtains the size of an array type along a specified dimension (class template) |
| (C++11) | removes all extents from the given array type (class template) |
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