extract_from_variant()

template<ProcessableData T>

std::span< T > MayaFlux::Kakshya::extract_from_variant	(	const DataVariant &	variant,
		std::vector< T > &	storage,
		ComplexConversionStrategy	strategy = ComplexConversionStrategy::MAGNITUDE
	)

Get typed span from DataVariant using concepts.

Template Parameters

T	Data type (must satisfy ProcessableData)

Parameters

variant

DataVariant to extract from

Returns

Span of type T, or empty span if type doesn't match

Definition at line 471 of file DataUtils.hpp.

{
    return std::visit([&storage, strategy](const auto& data) -> std::span<T> {
        using ValueType = typename std::decay_t<decltype(data)>::value_type;
 
        if constexpr (std::is_same_v<ValueType, T>) {
            storage = data;
            return std::span<T>(storage.data(), storage.size());
        } else if constexpr (is_convertible_data_v<ValueType, T>) {
            auto source_span = std::span<const ValueType>(data.data(), data.size());
            std::vector<ValueType> temp_source(source_span.begin(), source_span.end());
            auto temp_span = std::span<ValueType>(temp_source.data(), temp_source.size());
            return convert_data(temp_span, storage, strategy);
        } else {
            // throw std::runtime_error("Cannot convert from " + std::string(typeid(ValueType).name()) + " to " + std::string(typeid(T).name()));
            error<std::invalid_argument>(
                Journal::Component::Kakshya,
                Journal::Context::Runtime,
                std::source_location::current(),
                "No conversion available from {} to {}",
                typeid(ValueType).name(),
                typeid(T).name());
        }
    },
        variant);
}

References convert_data(), MayaFlux::Journal::Kakshya, MayaFlux::Journal::Runtime, and storage.

Referenced by MayaFlux::Kakshya::DynamicSoundStream::create_expanded_data(), and safe_copy_data_variant_to_span().

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