BloombergLP::bslstl::Variant_Union<t_HEAD, t_TAIL...>::Variant_Union

Synopses

Declared in <bslstl_variant.h>

Create a Variant_Union object having no active alternative.

Variant_Union() = default;

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Create a Variant_Union object holding an object of type t_HEAD direct-initialized from the specified args.

template<class... t_ARGS>
Variant_Union(
    bsl::in_place_index_t<0>,
    t_ARGS&&... args);

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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.

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

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