Invoke func on the contained value, or return an empty optional.
Synopsis
Declared in <bslstl_optional.h>
template<class t_FUNC>
constexpr
auto
and_then(t_FUNC&& func) &;Description
If this object contains a value, invoke the specified func with the contained value as an argument and return the result of that invocation; otherwise, return an empty optional. Note that func must return a specialization of bsl::optional. Also note that the return type of func does not have to be this object type. Also note that the optional object returned by func is returned as‐is, without copying or moving. Finally note that the default allocator is used for constructing the empty optional when func is not invoked.
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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