add_optional.hpp

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#ifndef UTIL_META_ADD_OPTIONAL_HPP_
#define UTIL_META_ADD_OPTIONAL_HPP_
 
#include <optional>
 
namespace util::meta
{
    template <typename T>
    struct add_optional {
        using type = std::optional<T>;
    };
 
    template <typename T>
    struct add_optional<T &> {
        using type = std::optional<std::reference_wrapper<T>>;
    };
 
    template <typename T>
    struct add_optional<std::optional<T>> {
        using type = std::optional<T>;
    };
 
    template <typename T>
    using add_optional_t = typename add_optional<T>::type;
} // namespace util::meta
 
#endif /* !UTIL_META_ADD_OPTIONAL_HPP_ */