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| // make_vector.hpp | |
| // | |
| // Copyright (c) 2019 Tristan Brindle (tcbrindle at gmail dot com) | |
| // Distributed under the Boost Software License, Version 1.0. (See | |
| // http://www.boost.org/LICENSE_1_0.txt) | |
| #include <type_traits> | |
| #include <vector> | |
| namespace tcb { | |
| namespace detail { | |
| template <typename T, typename...> | |
| struct vec_type_helper { | |
| using type = T; | |
| }; | |
| template <typename... Args> | |
| struct vec_type_helper<void, Args...> { | |
| using type = typename std::common_type<Args...>::type; | |
| }; | |
| template <typename T, typename... Args> | |
| using vec_type_helper_t = typename vec_type_helper<T, Args...>::type; | |
| template <typename T, typename...> | |
| struct all_constructible_and_convertible | |
| : std::true_type {}; | |
| template <typename T, typename First, typename... Rest> | |
| struct all_constructible_and_convertible<T, First, Rest...> | |
| : std::conditional< | |
| std::is_constructible<T, First>::value && | |
| std::is_convertible<First, T>::value, | |
| all_constructible_and_convertible<T, Rest...>, | |
| std::false_type>::type {}; | |
| } // nemspace detail | |
| template <typename T = void, typename... Args, | |
| typename V = detail::vec_type_helper_t<T, Args...>, | |
| typename std::enable_if< | |
| detail::all_constructible_and_convertible<V, Args...>::value, int>::type = 0> | |
| std::vector<V> make_vector(Args&&... args) | |
| { | |
| std::vector<V> vec; | |
| vec.reserve(sizeof...(Args)); | |
| using arr_t = int[]; | |
| (void) arr_t{0, (vec.emplace_back(std::forward<Args>(args)), 0)...}; | |
| return vec; | |
| } | |
| } |
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