Create a Variant_Union object holding the alternative at index (template parameter) t_INDEX.

Synopsis

Declared in <bslstl_variant.h>

template<
    size_t t_INDEX,
    class... t_ARGS>
Variant_Union(
    bsl::in_place_index_t<t_INDEX> inPlaceIndex,
    t_ARGS&&... args);

Description

Create a Variant_Union object holding the alternative at index (template parameter) t_INDEX in (template parameters) 't_HEAD, t_TAIL...`, direct‐initialized from the specified args'. Note that `t_INDEX is not necessarily the absolute index of the desired alternative in the bsl::variant object. We use the tag to "unravel" the union until we get to the desired alternative type.

Parameters

Name

Description

inPlaceIndex

tag selecting the alternative at index t_INDEX

args

arguments forwarded to the alternative's constructor

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