std::experimental::to_array
From cppreference.com
< cpp | experimental
Defined in header <experimental/array> | ||
template<class T, std::size_t N > constexprstd::array<std::remove_cv_t<T>, N> to_array(T (&a)[N]); | (library fundamentals TS v2) | |
Creates a std::array from the built-in array a. The elements of the std::array are copy-initialized from the corresponding element of a.
Contents |
[edit]Parameters
| a | - | the built-in array to be used to initialize the std::array |
[edit]Return value
An std::array object whose elements are copy-initialized from the corresponding element of a.
[edit]Possible implementation
namespace detail {template<class T, std::size_t N, std::size_t... I>constexprstd::array<std::remove_cv_t<T>, N> to_array_impl(T (&a)[N], std::index_sequence<I...>){return{{a[I]...}};}} template<class T, std::size_t N>constexprstd::array<std::remove_cv_t<T>, N> to_array(T (&a)[N]){return detail::to_array_impl(a, std::make_index_sequence<N>{});} |
[edit]Example
Run this code
#include <cassert>#include <cstdlib>#include <experimental/array>#include <unistd.h> // mkstemp(3) that workstemplate<std::size_t N>int tempfd(charconst(&tmpl)[N]){auto s = std::experimental::to_array(tmpl);int fd = mkstemp(s.data());if(fd !=-1) unlink(s.data()); return fd;} int main(){int fd = tempfd("/tmp/test.XXXXXX");int rt = close(fd);assert(rt ==0);}
[edit]See also
(library fundamentals TS v2) | creates a std::array object whose size and optionally element type are deduced from the arguments (function template) |
