Converting copy assignment operator.
Synopsis
Declared in <beman/optional/optional.hpp>
template<class U>
requires (std::is_constructible_v<T&, U> && !detail::reference_constructs_from_temporary_v<T&, U>)
constexpr
T&
emplace(U&& u) noexcept(std::is_nothrow_constructible_v<T &, U>);Description
If rhs has a value, assigns it to the stored value. Otherwise resets the stored value in *this. If T& can be constructed from a temporary, this assignment operator is deleted to prevent binding a temporary to a reference.
Return Value
optional&
Template Parameters
Name |
Description |
U |
Parameters
Name |
Description |
u |
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