If this object is non‐null, return a copy of the underlying object of a (template parameter) t_TYPE created using the provided allocator, and the specified value converted to t_TYPE using the specified allocator otherwise. Note that this method returns by value, so may be inefficient in some contexts.

Synopsis

Declared in <bslstl_optional.h>

template<class t_ANY_TYPE>
t_TYPE
value_or(
    std::allocator_arg_t,
    allocator_type allocator,
    t_ANY_TYPE&& value) const &;

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