This component‐private metafunction derives from bsl::true_type if (template parameter) t_TYPE occurs exactly once as an alternative of (template parameter) t_VARIANT, and bsl::false_type otherwise. An alternative must have the same cv‐qualification as t_TYPE in order to be counted. The primary template (used when t_VARIANT is not a bsl::variant) is not defined.

Synopsis

Declared in <bslstl_variant.h>

template<
    class t_TYPE,
    class t_VARIANT>
struct Variant_HasUniqueType;

Specializations

Name

Variant_HasUniqueType<t_TYPE, bsl::variant<t_HEAD, t_TAIL...>>

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