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Replace SFINAE with concepts (#5361)

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Concepts are cleaner to use and result in much better error messages for incorrect template use.
This commit is contained in:
Tyler Veness
2023-06-07 09:50:09 -07:00
committed by GitHub
parent d57d1a4598
commit 91cbcea841
42 changed files with 397 additions and 361 deletions
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20
wpilibNewCommands/src/test/native/cpp/frc2/command/make_vector.h
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@@ -34,8 +34,12 @@ struct all_constructible_and_convertible<T, First, Rest...>
std::is_constructible_v<T, First> && std::is_convertible_v<First, T>,
all_constructible_and_convertible<T, Rest...>, std::false_type> {};
template <typename T, typename... Args,
typename std::enable_if_t<!std::is_trivially_copyable_v<T>, int> = 0>
template <typename T, typename First, typename... Rest>
inline constexpr bool all_constructible_and_convertible_v =
all_constructible_and_convertible<T, First, Rest...>::value;
template <typename T, typename... Args>
requires(!std::is_trivially_copyable_v<T>)
std::vector<T> make_vector_impl(Args&&... args) {
std::vector<T> vec;
vec.reserve(sizeof...(Args));
@@ -44,19 +48,17 @@ std::vector<T> make_vector_impl(Args&&... args) {
return vec;
}
template <typename T, typename... Args,
typename std::enable_if_t<std::is_trivially_copyable_v<T>, int> = 0>
template <typename T, typename... Args>
requires std::is_trivially_copyable_v<T>
std::vector<T> make_vector_impl(Args&&... args) {
return std::vector<T>{std::forward<Args>(args)...};
}
} // namespace detail
template <
typename T = void, typename... Args,
typename V = detail::vec_type_helper_t<T, Args...>,
typename std::enable_if_t<
detail::all_constructible_and_convertible<V, Args...>::value, int> = 0>
template <typename T = void, typename... Args,
typename V = detail::vec_type_helper_t<T, Args...>>
requires detail::all_constructible_and_convertible_v<V, Args...>
std::vector<V> make_vector(Args&&... args) {
return detail::make_vector_impl<V>(std::forward<Args>(args)...);
}