Create a Variant_Base object whose index is the specified index without constructing an alternative object. If this Variant_Base is allocator‐aware, the specified allocator is used to supply memory.
Synopsis
Declared in <bslstl_variant.h>
Variant_Base(
std::allocator_arg_t,
allocator_type allocator,
Variant_ConstructFromStdTag,
size_t index);
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