mirror of
https://github.com/TartanLlama/optional.git
synced 2025-08-05 20:44:27 +02:00
Trivial destructor
This commit is contained in:
187
optional.hpp
187
optional.hpp
@@ -61,14 +61,14 @@ namespace tl {
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namespace detail {
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template <class T, class U>
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using enable_forward_value = tl::enable_if_t<
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using enable_forward_value = enable_if_t<
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std::is_constructible<T, U&&>::value &&
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!std::is_same<tl::decay_t<U>, in_place_t>::value &&
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!std::is_same<optional<T>, tl::decay_t<U>>::value
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>;
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template <class T, class U, class Other>
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using enable_from_other = tl::enable_if_t<
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using enable_from_other = enable_if_t<
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std::is_constructible<T, Other>::value &&
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!std::is_constructible<T, optional<U>&>::value &&
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!std::is_constructible<T, optional<U>&&>::value &&
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@@ -81,30 +81,30 @@ namespace tl {
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>;
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template <class T, class U>
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using enable_assign_forward = tl::enable_if_t<
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!is_same_v<optional<T>, tl::decay_t<U>>::value &&
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using enable_assign_forward = enable_if_t<
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!std::is_same<optional<T>, tl::decay_t<U>>::value &&
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!tl::conjunction<std::is_scalar<T>, std::is_same<T, tl::decay_t<U>>>::value &&
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std::is_constructible<T, U>::value &&
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is_assignable<T&, U>::value
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std::is_assignable<T&, U>::value
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>;
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template <class T, class U, class Other>
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using enable_assign_from_other = tl::enable_if_t<
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std::is_constructible<T, Other> &&
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std::is_assignablev<T&, Other> &&
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!std::is_constructiblev<T, optional<U>&> &&
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!std::is_constructiblev<T, optional<U>&&> &&
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!std::is_constructiblev<T, const optional<U>&> &&
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!std::is_constructiblev<T, const optional<U>&&> &&
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!std::is_convertiblev<optional<U>&, T> &&
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!std::is_convertiblev<optional<U>&&, T> &&
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!std::is_convertiblev<const optional<U>&, T> &&
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!std::is_convertiblev<const optional<U>&&, T> &&
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!std::is_assignablev<T&, optional<U>&> &&
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!std::is_assignablev<T&, optional<U>&&> &&
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!std::is_assignablev<T&, const optional<U>&> &&
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!std::is_assignablev<T&, const optional<U>&&>
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>
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using enable_assign_from_other = enable_if_t<
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std::is_constructible<T, Other>::value &&
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std::is_assignable<T&, Other>::value &&
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!std::is_constructible<T, optional<U>&>::value &&
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!std::is_constructible<T, optional<U>&&>::value &&
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!std::is_constructible<T, const optional<U>&>::value &&
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!std::is_constructible<T, const optional<U>&&>::value &&
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!std::is_convertible<optional<U>&, T>::value &&
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!std::is_convertible<optional<U>&&, T>::value &&
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!std::is_convertible<const optional<U>&, T>::value &&
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!std::is_convertible<const optional<U>&&, T>::value &&
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!std::is_assignable<T&, optional<U>&>::value &&
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!std::is_assignable<T&, optional<U>&&>::value &&
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!std::is_assignable<T&, const optional<U>&>::value &&
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!std::is_assignable<T&, const optional<U>&&>::value
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>;
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//TODO improve
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template <class T, class=void>
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@@ -121,6 +121,7 @@ namespace tl {
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template <class T>
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struct is_nothrow_swappable<T,void_t<decltype(swap(std::declval<T>(), std::declval<T>()))>>
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: std::true_type{};
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}
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// [optional.nullopt], no-value state indicator
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struct nullopt_t{
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@@ -195,88 +196,88 @@ namespace tl {
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}
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// [optional.nullops], comparison with nullopt
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template <class T> inline constexpr bool operator==(const optional<T>& lhs, nullopt_t) noexcept {
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template <class T> inline constexpr bool operator==(const optional<T>& lhs, nullopt_t) noexcept {
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return !lhs.has_value();
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}
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template <class T> inline constexpr bool operator==(nullopt_t, const optional<T>& rhs) noexcept {
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}
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template <class T> inline constexpr bool operator==(nullopt_t, const optional<T>& rhs) noexcept {
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return !rhs.has_value();
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}
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template <class T> inline constexpr bool operator!=(const optional<T>& lhs, nullopt_t) noexcept {
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}
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template <class T> inline constexpr bool operator!=(const optional<T>& lhs, nullopt_t) noexcept {
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return lhs.has_value();
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}
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template <class T> inline constexpr bool operator!=(nullopt_t, const optional<T>& rhs) noexcept {
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}
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template <class T> inline constexpr bool operator!=(nullopt_t, const optional<T>& rhs) noexcept {
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return rhs.has_value();
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}
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template <class T> inline constexpr bool operator<(const optional<T>&, nullopt_t) noexcept {
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}
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template <class T> inline constexpr bool operator<(const optional<T>&, nullopt_t) noexcept {
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return false;
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}
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template <class T> inline constexpr bool operator<(nullopt_t, const optional<T>& rhs) noexcept {
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}
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template <class T> inline constexpr bool operator<(nullopt_t, const optional<T>& rhs) noexcept {
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return rhs.has_value();
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}
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template <class T> inline constexpr bool operator<=(const optional<T>& lhs, nullopt_t) noexcept {
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}
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template <class T> inline constexpr bool operator<=(const optional<T>& lhs, nullopt_t) noexcept {
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return !lhs.has_value();
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}
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template <class T> inline constexpr bool operator<=(nullopt_t, const optional<T>&) noexcept {
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}
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template <class T> inline constexpr bool operator<=(nullopt_t, const optional<T>&) noexcept {
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return true;
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}
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template <class T> inline constexpr bool operator>(const optional<T>& lhs, nullopt_t) noexcept {
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}
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template <class T> inline constexpr bool operator>(const optional<T>& lhs, nullopt_t) noexcept {
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return lhs.has_value();
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}
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template <class T> inline constexpr bool operator>(nullopt_t, const optional<T>&) noexcept {
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}
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template <class T> inline constexpr bool operator>(nullopt_t, const optional<T>&) noexcept {
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return false;
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}
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template <class T> inline constexpr bool operator>=(const optional<T>&, nullopt_t) noexcept {
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}
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template <class T> inline constexpr bool operator>=(const optional<T>&, nullopt_t) noexcept {
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return true;
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}
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template <class T> inline constexpr bool operator>=(nullopt_t, const optional<T>& rhs) noexcept {
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}
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template <class T> inline constexpr bool operator>=(nullopt_t, const optional<T>& rhs) noexcept {
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return !rhs.has_value();
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}
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}
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// [optional.comp_with_t], comparison with T
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template <class T, class U> inline constexpr bool operator==(const optional<T>& lhs, const U& rhs) {
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template <class T, class U> inline constexpr bool operator==(const optional<T>& lhs, const U& rhs) {
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return lhs.has_value() ? *lhs == rhs : false;
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}
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template <class T, class U> inline constexpr bool operator==(const U& lhs, const optional<T>& rhs) {
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}
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template <class T, class U> inline constexpr bool operator==(const U& lhs, const optional<T>& rhs) {
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return rhs.has_value() ? lhs == rhs.value() : false;
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}
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template <class T, class U> inline constexpr bool operator!=(const optional<T>& lhs, const U& rhs) {
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}
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template <class T, class U> inline constexpr bool operator!=(const optional<T>& lhs, const U& rhs) {
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return lhs.has_value() ? lhs.value() != lhs : true;
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}
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template <class T, class U> inline constexpr bool operator!=(const U& lhs, const optional<T>& rhs) {
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}
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template <class T, class U> inline constexpr bool operator!=(const U& lhs, const optional<T>& rhs) {
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return rhs.has_value() ? lhs != rhs.value() : true;
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}
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template <class T, class U> inline constexpr bool operator<(const optional<T>& lhs, const U& rhs) {
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}
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template <class T, class U> inline constexpr bool operator<(const optional<T>& lhs, const U& rhs) {
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return lhs.has_value() ? lhs.value() < lhs : true;
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}
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template <class T, class U> inline constexpr bool operator<(const U& lhs, const optional<T>& rhs) {
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}
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template <class T, class U> inline constexpr bool operator<(const U& lhs, const optional<T>& rhs) {
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return rhs.has_value() ? lhs < rhs.value() : false;
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}
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template <class T, class U> inline constexpr bool operator<=(const optional<T>& lhs, const U& rhs) {
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}
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template <class T, class U> inline constexpr bool operator<=(const optional<T>& lhs, const U& rhs) {
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return lhs.has_value() ? lhs.value() <= lhs : true;
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}
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template <class T, class U> inline constexpr bool operator<=(const U& lhs, const optional<T>& rhs) {
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}
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template <class T, class U> inline constexpr bool operator<=(const U& lhs, const optional<T>& rhs) {
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return rhs.has_value() ? lhs <= rhs.value() : false;
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}
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template <class T, class U> inline constexpr bool operator>(const optional<T>& lhs, const U& rhs) {
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}
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template <class T, class U> inline constexpr bool operator>(const optional<T>& lhs, const U& rhs) {
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return lhs.has_value() ? lhs.value() > lhs : false;
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}
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template <class T, class U> inline constexpr bool operator>(const U& lhs, const optional<T>& rhs) {
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}
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template <class T, class U> inline constexpr bool operator>(const U& lhs, const optional<T>& rhs) {
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return rhs.has_value() ? lhs > rhs.value() : true;
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}
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template <class T, class U> inline constexpr bool operator>=(const optional<T>& lhs, const U& rhs) {
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}
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template <class T, class U> inline constexpr bool operator>=(const optional<T>& lhs, const U& rhs) {
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return lhs.has_value() ? lhs.value() >= lhs : false;
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}
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template <class T, class U> inline constexpr bool operator>=(const U& lhs, const optional<T>& rhs) {
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}
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template <class T, class U> inline constexpr bool operator>=(const U& lhs, const optional<T>& rhs) {
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return rhs.has_value() ? lhs >= rhs.value() : true;
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}
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}
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// [optional.specalg], specialized algorithms
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template <class T, tl::enable_if_t<std::is_move_constructible<T>::value>* = nullptr,
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tl::enable_if_t<is_swappable<T>::value>* = nullptr>
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void swap(optional<T>& lhs, optional<T>& rhs) noexcept(noexcept(lhs.swap(rhs))) {
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template <class T, enable_if_t<std::is_move_constructible<T>::value>* = nullptr,
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enable_if_t<detail::is_swappable<T>::value>* = nullptr>
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void swap(optional<T>& lhs, optional<T>& rhs) noexcept(noexcept(lhs.swap(rhs))) {
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return lhs.swap(rhs);
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}
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}
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template <class T>
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inline constexpr optional<tl::decay_t<T>> make_optional(T&& v) {
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@@ -297,7 +298,7 @@ namespace std {
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//TODO SFINAE
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template <class T>
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struct hash<tl::optional<T>> {
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std::size_t operator() (const tl::optional<T>& o) const {
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::std::size_t operator() (const tl::optional<T>& o) const {
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if (!o.has_value())
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return 0;
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@@ -307,9 +308,8 @@ namespace std {
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}
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namespace tl {
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namespace detail {
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template <class T, bool = std::is_trivially_destructible<T>::value>
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template <class T, bool = ::std::is_trivially_destructible<T>::value>
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struct optional_storage_base {
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constexpr optional_storage_base() noexcept
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: m_dummy(), m_has_value(false) {}
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@@ -333,12 +333,7 @@ namespace tl {
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struct optional_storage_base<T, true> {
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constexpr optional_storage_base() noexcept
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: m_dummy(), m_has_value(false) {}
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~optional_storage_base() {
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if (m_has_value) {
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//don't destruct value
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m_has_value = false;
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}
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}
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~optional_storage_base() = default;
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struct dummy{};
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union {
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@@ -350,8 +345,8 @@ namespace tl {
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};
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}
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template <class T>
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class optional : private detail::optional_storage_base<T> {
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template <class T>
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class optional : private detail::optional_storage_base<T> {
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public:
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using value_type = T;
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@@ -364,7 +359,7 @@ class optional : private detail::optional_storage_base<T> {
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new (std::addressof(this->m_value)) T (rhs.value());
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}
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}
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template <class U = T, tl::enable_if_t<std::is_move_constructible<T>::value>* = nullptr>
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template <class U = T, enable_if_t<std::is_move_constructible<T>::value>* = nullptr>
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constexpr optional(optional&& rhs) {
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if (rhs.has_value()) {
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this->m_has_value = true;
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@@ -372,27 +367,27 @@ class optional : private detail::optional_storage_base<T> {
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}
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}
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template <class... Args>
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constexpr explicit optional(tl::enable_if_t<std::is_constructible<T, Args...>::value, in_place_t>,
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constexpr explicit optional(enable_if_t<std::is_constructible<T, Args...>::value, in_place_t>,
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Args&&... args) {
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this->m_has_value = true;
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new (std::addressof(this->m_value)) T (std::forward<Args>(args)...);
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}
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template <class U, class... Args>
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constexpr explicit optional(
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tl::enable_if_t<std::is_constructible<T, std::initializer_list<U>&, Args&&...>::value, in_place_t>,
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enable_if_t<std::is_constructible<T, std::initializer_list<U>&, Args&&...>::value, in_place_t>,
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std::initializer_list<U> il, Args&&... args) {
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this->m_has_value = true;
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new (std::addressof(this->m_value)) T (il, std::forward<Args>(args)...);
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}
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template <class U = T, tl::enable_if_t<std::is_convertible<U&&, T>::value>* = nullptr,
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template <class U = T, enable_if_t<std::is_convertible<U&&, T>::value>* = nullptr,
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detail::enable_forward_value<T,U>* = nullptr>
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constexpr optional(U&& u) {
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this->m_has_value = true;
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new (std::addressof(this->m_value)) T (std::forward<U>(u));
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}
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template <class U = T, tl::enable_if_t<!std::is_convertible<U&&, T>::value>* = nullptr,
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template <class U = T, enable_if_t<!std::is_convertible<U&&, T>::value>* = nullptr,
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detail::enable_forward_value<T,U>* = nullptr>
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constexpr explicit optional(U&& u) {
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this->m_has_value = true;
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@@ -400,21 +395,21 @@ class optional : private detail::optional_storage_base<T> {
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}
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template <class U, detail::enable_from_other<T,U,const U&>* = nullptr,
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tl::enable_if_t<std::is_convertible<const U&, T>::value>* = nullptr>
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enable_if_t<std::is_convertible<const U&, T>::value>* = nullptr>
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optional(const optional<U>& rhs) {
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this->m_has_value = true;
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new (std::addressof(this->m_value)) T (rhs.value());
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}
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template <class U, detail::enable_from_other<T,U,const U&>* = nullptr,
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tl::enable_if_t<!std::is_convertible<const U&, T>::value>* = nullptr>
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enable_if_t<!std::is_convertible<const U&, T>::value>* = nullptr>
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optional(const optional<U>& rhs) {
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this->m_has_value = true;
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new (std::addressof(this->m_value)) T (rhs.value());
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}
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template <class U, detail::enable_from_other<T,U,U&&>* = nullptr,
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tl::enable_if_t<std::is_convertible<U&&, T>::value>* = nullptr>
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enable_if_t<std::is_convertible<U&&, T>::value>* = nullptr>
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optional(optional<U>&& rhs) {
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this->m_has_value = true;
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new (std::addressof(this->m_value)) T (std::move(rhs.value()));
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@@ -488,7 +483,7 @@ class optional : private detail::optional_storage_base<T> {
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}
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}
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// TODO SFINAE, check exception guarantee
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// TODO check exception guarantee
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template <class U, detail::enable_assign_from_other<T,U,const U&>* = nullptr>
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optional& operator=(const optional<U>& rhs) {
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if (has_value()) {
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@@ -507,7 +502,7 @@ class optional : private detail::optional_storage_base<T> {
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}
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}
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// TODO SFINAE, check exception guarantee
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// TODO check exception guarantee
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template <class U, detail::enable_assign_from_other<T,U,U>* = nullptr>
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optional& operator=(optional<U>&& rhs) {
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if (has_value()) {
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@@ -535,7 +530,7 @@ class optional : private detail::optional_storage_base<T> {
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}
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template <class U, class... Args>
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tl::enable_if_t<std::is_constructible<T, std::initializer_list<U>&, Args&&...>::value, T&>
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enable_if_t<std::is_constructible<T, std::initializer_list<U>&, Args&&...>::value, T&>
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emplace(std::initializer_list<U> il, Args&&... args) {
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*this = nullopt;
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new (std::addressof(this->m_value)) T(il, std::forward<Args>(args)...);
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@@ -543,7 +538,7 @@ class optional : private detail::optional_storage_base<T> {
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// [optional.swap], swap
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void swap(optional& rhs)
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noexcept(std::is_nothrow_move_constructible<T>::value && is_nothrow_swappable<T>::value)
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noexcept(std::is_nothrow_move_constructible<T>::value && detail::is_nothrow_swappable<T>::value)
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{
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if (has_value()) {
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if (rhs.has_value()) {
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