TemplateUtils.hpp

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#pragma once
 
namespace Cori {
    namespace Utility {
        template <typename T, typename... Types>
        concept IsInPack = (std::same_as<T, Types> || ...);
 
        namespace Internal {
            template <typename... Types>
            inline constexpr bool HasDuplicatesImpl = false;
 
            template <typename T, typename... Rest>
            inline constexpr bool HasDuplicatesImpl<T, Rest...> = IsInPack<T, Rest...> || HasDuplicatesImpl<Rest...>;
        }

        template <typename... Types>
        concept HasDuplicates = Internal::HasDuplicatesImpl<Types...>;

        template <typename T>
        concept IsStreamable = requires(std::ostream& os, const T& val) {
            { os << val } -> std::same_as<std::ostream&>;
        };
    }
}