This component‐private metafunction computes the index of the alternative in (template parameter) t_VARIANT that is the "unique" best match for conversion from std::declval<t_TYPE>(), or bsl::variant_npos if there is no such alternative. An alternative that occurs multiple times in t_VARIANT (possibly with varying cv‐qualifications) is considered to occur only once; thus, if all alternatives that are tied for the best match are the same type (possibly with varying cv‐qualifications), the result is the lowest index at which that type (with any cv‐qualification) occurs.

Synopsis

Declared in <bslstl_variant.h>

template<
    class t_TYPE,
    class t_VARIANT>
struct Variant_ConvertIndex
    : Variant_OverloadHelper<t_TYPE, t_VARIANT>::Index

Base Classes

Name

Description

Variant_OverloadHelper<t_TYPE, t_VARIANT>::Index

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