bsl::optional::and_then

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 &&;

result of func if engaged, otherwise an empty optional

Name	Description
func	callable invoked with the contained value or when empty