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std::remove_extent(3) C++ Standard Libary std::remove_extent(3) NAME std::remove_extent - std::remove_extent Synopsis Defined in header <type_traits> template< class T > (since C++11) struct remove_extent; 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. If the program adds specializations for std::remove_extent, the be- havior is undefined. Member types Name Definition type the type of the element of T Helper types template< class T > (since C++14) using remove_extent_t = typename remove_extent<T>::type; Possible implementation template<class T> struct remove_extent { using type = T; }; template<class T> struct remove_extent<T[]> { using type = T; }; template<class T, std::size_t N> struct remove_extent<T[N]> { using type = T; }; Example // Run this code #include <algorithm> #include <iostream> #include <iterator> #include <type_traits> template<class A> std::enable_if_t<std::rank_v<A> == 1> print_1d(const A& a) { std::copy(a, a + std::extent_v<A>, std::ostream_iterator<std::remove_extent_t<A>>(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: 4 5 6 See also is_array checks if a type is an array type (C++11) (class template) rank obtains the number of dimensions of an array type (C++11) (class template) extent obtains the size of an array type along a speci- fied dimension (C++11) (class template) remove_all_extents removes all extents from the given array type (C++11) (class template) http://cppreference.com 2024.06.10 std::remove_extent(3)
NAME | Synopsis | Member types | Helper types | Possible implementation | Example | Output: | See also
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