Create a Variant_Base object holding the alternative with index (template parameter) t_INDEX, direct‐initialized from the specified args. If this Variant_Base is allocator‐aware, the specified allocator is used to supply memory.
Synopsis
Declared in <bslstl_variant.h>
template<
size_t t_INDEX,
class... t_ARGS>
explicit
Variant_Base(
std::allocator_arg_t,
allocator_type allocator,
bsl::in_place_index_t<t_INDEX>,
t_ARGS&&... args);
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