Return the contained value, or a converted fallback if disengaged.
Synopses
Declared in <bslstl_optional.h>
Return the contained value, or a converted fallback if disengaged.
template<class t_ANY_TYPE>
t_TYPE
value_or(t_ANY_TYPE&& value) &&;Return the contained value, or a converted fallback if disengaged.
template<class t_ANY_TYPE>
t_TYPE
value_or(t_ANY_TYPE&& value) const &;Return the contained value, or a converted fallback if disengaged.
template<class t_ANY_TYPE>
t_TYPE
value_or(
std::allocator_arg_t allocatorArg,
allocator_type allocator,
t_ANY_TYPE&& value) &&;Return the contained value, or a converted fallback if disengaged.
template<class t_ANY_TYPE>
t_TYPE
value_or(
std::allocator_arg_t allocatorArg,
allocator_type allocator,
t_ANY_TYPE&& value) const &;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 |
allocatorArg |
tag selecting the allocator‐extended constructor |
allocator |
allocator used to supply memory |
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