Compute the alternative type at index t_INDEX of a bsl::variant.

Synopsis

Declared in <bslstl_variant.h>

template<
    std::size_t t_INDEX,
    class t_HEAD,
    class... t_TAIL>
struct variant_alternative<t_INDEX, variant<t_HEAD, t_TAIL...>>
    : Variant_VariantAlternativeImpl<t_INDEX, t_HEAD, t_TAIL...>

Description

This partial specialization of variant_alternative computes the alternative type at index t_INDEX for a bsl::variant specialized on (template parameters) t_HEAD, t_TAIL....

t_INDEX shall be a valid alternative index for the variant.

Base Classes

Name

Description

Variant_VariantAlternativeImpl<t_INDEX, t_HEAD, t_TAIL...>

This component‐private metafunction provides the implementation of bsl::variant_alternative.

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