Technical Specification
Filesystem library (filesystem TS)
Library fundamentals (library fundamentals TS)
Library fundamentals 2 (library fundamentals TS v2)
Library fundamentals 3 (library fundamentals TS v3)
Extensions for parallelism (parallelism TS)
Extensions for parallelism 2 (parallelism TS v2)
Extensions for concurrency (concurrency TS)
Extensions for concurrency 2 (concurrency TS v2)
Concepts (concepts TS)
Ranges (ranges TS)
Reflection (reflection TS)
Mathematical special functions (special functions TR)
Experimental Non-TS
Pattern Matching
Linear Algebra
2D Graphics
Defined in header <experimental/array>
template< class D = void, class... Types >
constexpr std::array<VT /* see below */, sizeof...(Types)> make_array( Types&&... t );
(library fundamentals TS v2)

Creates a std::array whose size is equal to the number of arguments and whose elements are initialized from the corresponding arguments. Returns std::array<VT, sizeof...(Types)>{std::forward<Types>(t)...}.

If D is void, then the deduced type VT is std::common_type_t<Types...>. Otherwise, it is D.

If D is void and any of std::decay_t<Types>... is a specialization of std::reference_wrapper, the program is ill-formed.


[edit] Notes

make_array is removed in Library Fundamentals TS v3 because the deduction guide for std::array and std::to_array have been already in C++20.

[edit] Possible implementation

namespace details
    template<class> struct is_ref_wrapper : std::false_type{};
    template<class T> struct is_ref_wrapper<std::reference_wrapper<T>> : std::true_type{};
    template<class T>
    using not_ref_wrapper = std::negation<is_ref_wrapper<std::decay_t<T>>>;
    template<class D, class...> struct return_type_helper { using type = D; };
    template<class... Types>
    struct return_type_helper<void, Types...> : std::common_type<Types...>
                      "Types cannot contain reference_wrappers when D is void");
    template<class D, class... Types>
    using return_type = std::array<typename return_type_helper<D, Types...>::type,
template<class D = void, class... Types>
constexpr details::return_type<D, Types...> make_array(Types&&... t)
    return {std::forward<Types>(t)...};

[edit] Example

#include <experimental/array>
#include <iostream>
#include <type_traits>
int main()
    auto arr = std::experimental::make_array(1, 2, 3, 4, 5);
    bool is_array_of_5_ints = std::is_same<decltype(arr), std::array<int, 5>>::value;
    std::cout << "Returns an array of five ints? ";
    std::cout << std::boolalpha << is_array_of_5_ints << '\n';


Returns an array of five ints? true

[edit] See also

C++ documentation for std::array deduction guides
creates a std::array object from a built-in array
(function template) [edit]