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compressed_pair: constexpr-ness all the way (see #883)

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This commit is contained in:
Michele Caini
2022-05-03 18:37:39 +02:00
parent 1673a5ade9
commit c38708c483
1 changed files with 18 additions and 18 deletions
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36
src/entt/core/compressed_pair.hpp
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@@ -23,22 +23,22 @@ struct compressed_pair_element {
using const_reference = const Type &;
template<bool Dummy = true, typename = std::enable_if_t<Dummy && std::is_default_constructible_v<Type>>>
compressed_pair_element()
constexpr compressed_pair_element()
: value{} {}
template<typename Args, typename = std::enable_if_t<!std::is_same_v<std::remove_cv_t<std::remove_reference_t<Args>>, compressed_pair_element>>>
compressed_pair_element(Args &&args)
constexpr compressed_pair_element(Args &&args)
: value{std::forward<Args>(args)} {}
template<typename... Args, std::size_t... Index>
compressed_pair_element(std::tuple<Args...> args, std::index_sequence<Index...>)
constexpr compressed_pair_element(std::tuple<Args...> args, std::index_sequence<Index...>)
: value{std::forward<Args>(std::get<Index>(args))...} {}
[[nodiscard]] reference get() ENTT_NOEXCEPT {
[[nodiscard]] constexpr reference get() ENTT_NOEXCEPT {
return value;
}
[[nodiscard]] const_reference get() const ENTT_NOEXCEPT {
[[nodiscard]] constexpr const_reference get() const ENTT_NOEXCEPT {
return value;
}
@@ -53,22 +53,22 @@ struct compressed_pair_element<Type, Tag, std::enable_if_t<is_ebco_eligible_v<Ty
using base_type = Type;
template<bool Dummy = true, typename = std::enable_if_t<Dummy && std::is_default_constructible_v<base_type>>>
compressed_pair_element()
constexpr compressed_pair_element()
: base_type{} {}
template<typename Args, typename = std::enable_if_t<!std::is_same_v<std::remove_cv_t<std::remove_reference_t<Args>>, compressed_pair_element>>>
compressed_pair_element(Args &&args)
constexpr compressed_pair_element(Args &&args)
: base_type{std::forward<Args>(args)} {}
template<typename... Args, std::size_t... Index>
compressed_pair_element(std::tuple<Args...> args, std::index_sequence<Index...>)
constexpr compressed_pair_element(std::tuple<Args...> args, std::index_sequence<Index...>)
: base_type{std::forward<Args>(std::get<Index>(args))...} {}
[[nodiscard]] reference get() ENTT_NOEXCEPT {
[[nodiscard]] constexpr reference get() ENTT_NOEXCEPT {
return *this;
}
[[nodiscard]] const_reference get() const ENTT_NOEXCEPT {
[[nodiscard]] constexpr const_reference get() const ENTT_NOEXCEPT {
return *this;
}
};
@@ -169,12 +169,12 @@ public:
* @brief Returns the first element that a pair stores.
* @return The first element that a pair stores.
*/
[[nodiscard]] first_type &first() ENTT_NOEXCEPT {
[[nodiscard]] constexpr first_type &first() ENTT_NOEXCEPT {
return static_cast<first_base &>(*this).get();
}
/*! @copydoc first */
[[nodiscard]] const first_type &first() const ENTT_NOEXCEPT {
[[nodiscard]] constexpr const first_type &first() const ENTT_NOEXCEPT {
return static_cast<const first_base &>(*this).get();
}
@@ -182,12 +182,12 @@ public:
* @brief Returns the second element that a pair stores.
* @return The second element that a pair stores.
*/
[[nodiscard]] second_type &second() ENTT_NOEXCEPT {
[[nodiscard]] constexpr second_type &second() ENTT_NOEXCEPT {
return static_cast<second_base &>(*this).get();
}
/*! @copydoc second */
[[nodiscard]] const second_type &second() const ENTT_NOEXCEPT {
[[nodiscard]] constexpr const second_type &second() const ENTT_NOEXCEPT {
return static_cast<const second_base &>(*this).get();
}
@@ -195,7 +195,7 @@ public:
* @brief Swaps two compressed pair objects.
* @param other The compressed pair to swap with.
*/
void swap(compressed_pair &other) {
constexpr void swap(compressed_pair &other) {
using std::swap;
swap(first(), other.first());
swap(second(), other.second());
@@ -208,7 +208,7 @@ public:
* reference to the second element if `Index` is 1.
*/
template<std::size_t Index>
decltype(auto) get() ENTT_NOEXCEPT {
constexpr decltype(auto) get() ENTT_NOEXCEPT {
if constexpr(Index == 0u) {
return first();
} else {
@@ -219,7 +219,7 @@ public:
/*! @copydoc get */
template<std::size_t Index>
decltype(auto) get() const ENTT_NOEXCEPT {
constexpr decltype(auto) get() const ENTT_NOEXCEPT {
if constexpr(Index == 0u) {
return first();
} else {
@@ -245,7 +245,7 @@ compressed_pair(Type &&, Other &&) -> compressed_pair<std::decay_t<Type>, std::d
* @param rhs A valid compressed pair object.
*/
template<typename First, typename Second>
inline void swap(compressed_pair<First, Second> &lhs, compressed_pair<First, Second> &rhs) {
inline constexpr void swap(compressed_pair<First, Second> &lhs, compressed_pair<First, Second> &rhs) {
lhs.swap(rhs);
}