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BDE 4.39.x Production Release
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This component-private metafunction computes t_INDEX + i, where i is the zero-based index of the first occurrence of (template parameter) t_TYPE in (template parameters) t_HEAD, t_TAIL..., or bsl::variant_npos if not found. An alternative is considered to match t_TYPE if the two types are the same modulo cv-qualification. This metafunction is used to implement Variant_ConvertIndex.