Create a variant object holding the t_INDEX alternative from args using allocator.
Declared in <bslstl_variant.h>
template<
std::size_t t_INDEX,
class... t_ARGS>
requires (t_INDEX < 1 + sizeof...(t_TAIL)) &&
std::is_constructible<BSLSTL_VARIANT_TYPE_AT_INDEX(t_INDEX),
t_ARGS...>::value
explicit
variant(
std::allocator_arg_t allocatorArg,
allocator_type allocator,
bsl::in_place_index_t<t_INDEX> inPlaceIndex,
t_ARGS&&... args);Create a variant object holding the alternative with index (template parameter) t_INDEX, direct-initialized from the specified args. If this variant is allocator-aware, the specified allocator is used to supply memory. This constructor participates in overload resolution only if t_INDEX is a valid alternative index and the designated alternative is constructible from args.
| Name | Description |
|---|---|
| allocatorArg | tag selecting the allocator-extended overload |
| allocator | allocator used to supply memory |
| inPlaceIndex | tag selecting the t_INDEX alternative |
| args | arguments used to construct the selected alternative |