and_then overloads
Synopses
Declared in <bslstl_optional.h>
Invoke func on the contained value, or return an empty optional.
template<class t_FUNC>
constexpr
auto
and_then(t_FUNC&& func) &;Invoke the specified func on the contained value and return its optional result as a const lvalue.
template<class t_FUNC>
constexpr
auto
and_then(t_FUNC&& func) const &;Invoke the specified func on the contained value and return its optional result as an rvalue.
template<class t_FUNC>
constexpr
auto
and_then(t_FUNC&& func) &&;Invoke the specified func on the contained value and return its optional result as a const rvalue.
template<class t_FUNC>
constexpr
auto
and_then(t_FUNC&& func) const &&;Return Value
result of func if engaged, otherwise an empty optional
Parameters
Name |
Description |
func |
callable invoked with the contained value or when empty |
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