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std::experi...al::to_array(3) C++ Standard Libarystd::experi...al::to_array(3) NAME std::experimental::to_array - std::experimental::to_array Synopsis Defined in header <experimental/array> template <class T, std::size_t N> (library fundamentals TS constexpr std::array<std::remove_cv_t<T>, N> to_array(T v2) (&a)[N]); 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. Parameters a - the built-in array to be used to initialize the std::array Return value An std::array object whose elements are copy-initialized from the corresponding element of a. Possible implementation namespace detail { template <class T, std::size_t N, std::size_t... I> constexpr std::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> constexpr std::array<std::remove_cv_t<T>, N> to_array(T (&a)[N]) { return detail::to_array_impl(a, std::make_index_sequence<N>{}); } Example // Run this code #include <cstdlib> #include <cassert> #include <experimental/array> #include <unistd.h> // mkstemp(3) that works template <std::size_t N> int tempfd(char const (&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); } See also make_array Creates a std::array object whose size and optionally (library fundamentals TS v2) element type are deduced from the argu- ments (function template) http://cppreference.com 2022.07.31 std::experi...al::to_array(3)
NAME | Synopsis | Parameters | Return value | Possible implementation | Example | See also
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