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Simon Brand committed 2017-10-21 20:08:43 +01:00
1 parent ed27d58e95
commit 470595d91a
4 files changed
+84 -18
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optional.hpp
+16 -6
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@@ -683,32 +683,42 @@ public:
/// \details If there is a value stored, then `f` is called with `**this` and the value is returned.
/// Otherwise `std::forward<U>(u)()` is returned.
/// \group map_or_else
template <class F, class U> U map_or_else(F &&f, U &&u) & {
/// \synopsis template <class F, class U>\nauto map_or_else(F &&f, U &&u) &;
template <class F, class U>
detail::invoke_result_t<U> map_or_else(F &&f, U &&u) & {
return has_value() ? detail::invoke(std::forward<F>(f), **this)
: std::forward<U>(u)();
}
/// \group map_or_else
template <class F, class U> U map_or_else(F &&f, U &&u) && {
/// \synopsis template <class F, class U>\nauto map_or_else(F &&f, U &&u) &&;
template <class F, class U>
detail::invoke_result_t<U> map_or_else(F &&f, U &&u) && {
return has_value() ? detail::invoke(std::forward<F>(f), std::move(**this))
: std::forward<U>(u)();
}
/// \group map_or_else
template <class F, class U> U map_or_else(F &&f, U &&u) const & {
/// \synopsis template <class F, class U>\nauto map_or_else(F &&f, U &&u) const &;
template <class F, class U>
detail::invoke_result_t<U> map_or_else(F &&f, U &&u) const & {
return has_value() ? detail::invoke(std::forward<F>(f), **this)
: std::forward<U>(u)();
}
/// \group map_or_else
template <class F, class U> U map_or_else(F &&f, U &&u) const && {
/// \synopsis template <class F, class U>\nauto map_or_else(F &&f, U &&u) const &&;
template <class F, class U>
detail::invoke_result_t<U> map_or_else(F &&f, U &&u) const && {
return has_value() ? detail::invoke(std::forward<F>(f), std::move(**this))
: std::forward<U>(u)();
}
/// \returns `u` if `*this` has a value, otherwise an empty optional.
template <class U> constexpr optional<U> conjunction (U &&u) const {
return has_value() ? u : nullopt;
template <class U>
constexpr optional<typename std::decay<U>::type> conjunction (U &&u) const {
using result = optional<detail::decay_t<U>>;
return has_value() ? result{u} : result{nullopt};
}
/// \returns `rhs` if `*this` is empty, otherwise the current value.