Stroika::Foundation::Common::Private_ Namespace Reference

Detailed Description

Utility to map from an std::variant<...> and map a TYPE to its underlying index in the given variant

\note Considered doing this as a function, so could take optional argument and use to figure out
      type of VARIANT_VALUE, but frequently used in constexpr setting where this probably would
      be helpful (see below example).

Example Usage

variant<filesystem::path, BLOB, String> fSourceData_;
template <typename T>
static constexpr size_t VariantIndex_ = VariantIndex<decltype(fSourceData_), T>;
...
switch (fSourceData_.index ()) {
    case VariantIndex_<filesystem::path>:
    case VariantIndex_<BLOB>:
        return Streams::BinaryToText::Reader::New (NewReadStream<byte> ());
    case VariantIndex_<String>:
        return Streams::BinaryToText::Reader::New (get<String> (fSourceData_));
    default:
        AssertNotReached ();
        return {};
}