Return the contained value, or a converted fallback if disengaged.
Synopsis
Declared in <bslstl_optional.h>
template<class t_ANY_TYPE>
t_TYPE
value_or(t_ANY_TYPE&& value) &&;Description
Return a copy of the underlying object of a (template parameter) t_TYPE if this object is non‐null, and the specified value converted to t_TYPE otherwise. Note that this method returns by value, so may be inefficient in some contexts.
Return Value
contained value if engaged, otherwise value converted to t_TYPE
Parameters
Name |
Description |
value |
value compared with or used to initialize the optional |
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