bsl::variant::variant

Create a variant object holding the t_INDEX alternative from args using allocator.

Synopsis

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);

Description

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.

Parameters

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

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