extract_from_variant_at()

template<typename T >

std::optional< T > MayaFlux::Kakshya::extract_from_variant_at	(	const DataVariant &	variant,
		uint64_t	pos
	)

Extract a value of type T from a DataVariant at a specific position.

Template Parameters

T	Desired type.

Parameters

variant	DataVariant to extract from.
pos	Position in the data.

Returns

Optional value of type T.

Definition at line 513 of file DataUtils.hpp.

{
    return std::visit([pos](const auto& data) -> std::optional<T> {
        using DataType = std::decay_t<decltype(data)>;
        using ValueType = typename DataType::value_type;
 
        if (pos >= data.size()) {
            return std::nullopt;
        }
 
        if constexpr (std::is_same_v<ValueType, T>) {
            return data[pos];
        } else if constexpr (std::is_arithmetic_v<ValueType> && std::is_arithmetic_v<T>) {
            return static_cast<T>(data[pos]);
        } else if constexpr (std::is_same_v<ValueType, std::complex<float>> || std::is_same_v<ValueType, std::complex<double>>) {
            if constexpr (std::is_arithmetic_v<T>) {
                return static_cast<T>(std::abs(data[pos]));
            } else {
                return std::nullopt;
            }
        } else {
            return std::nullopt;
        }
    },
        variant);
}