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.
Declared in <bslstl_variant.h>
template<
class t_TYPE,
class t_VARIANT>
struct Variant_HasUniqueType;| Name |
|---|
Variant_HasUniqueType<t_TYPE, bsl::variant<t_HEAD, t_TAIL...>> |