Exchange the values of two optionals.
Declared in <bslstl_optional.h>
template<class t_TYPE>
constexpr
void
swap(
bsl::optional<t_TYPE>& lhs,
bsl::optional<t_TYPE>& rhs)
requires !BloombergLP::bslma::UsesBslmaAllocator<t_TYPE>::value;Efficiently exchange the values of the specified lhs and rhs objects. This method provides the no-throw exception-safety guarantee if the template parameter t_TYPE provides that guarantee and the result of the hasValue method for lhs and rhs is the same.
| Name | Description |
|---|---|
| lhs | left-hand operand |
| rhs | right-hand operand |