Traits.h

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/*******************************************************************************
 
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#pragma once
 
#include <Zivid/DataModel/NodeType.h>
 
#include <type_traits>
 
namespace Zivid
{
    namespace DataModel
    {
#ifndef NO_DOC
        namespace Detail
        {
            template<class...>
            using Void = void;
 
            void acceptNodeType(Zivid::DataModel::NodeType);
 
            template<typename T, typename = void>
            struct IsDataModelType : std::false_type
            {};
 
            template<typename T>
            struct IsDataModelType<T, Void<decltype(acceptNodeType(std::decay<T>::type::nodeType))>> : std::true_type
            {};
 
            template<typename T>
            struct IsDataModelLeaf
            {
            private:
                template<typename C,
                         typename std::enable_if<std::decay<C>::type::nodeType == Zivid::DataModel::NodeType::leafValue
                                                     || std::decay<C>::type::nodeType
                                                            == Zivid::DataModel::NodeType::leafDataModelList,
                                                 int>::type = 0>
                static constexpr std::true_type isLeafHelper(int);
                template<typename C, typename... Args>
                static constexpr std::false_type isLeafHelper(Args &&...);
 
            public:
                using Type = decltype(isLeafHelper<T>(0));
            };
 
            template<typename T, typename = void>
            struct IsOptional : std::false_type
            {};
 
            template<typename T>
            struct IsOptional<T, Void<decltype(std::declval<T>().hasValue())>> : std::true_type
            {};
 
            template<typename T, typename = void>
            struct HasValidRange : std::false_type
            {};
 
            template<typename T>
            struct HasValidRange<T, Void<decltype(std::declval<typename std::decay<T>::type>().validRange())>>
                : std::true_type
            {};
 
            template<typename T, typename = void>
            struct HasValidValues : std::false_type
            {};
 
            template<typename T>
            struct HasValidValues<T, Void<decltype(std::declval<typename std::decay<T>::type>().validValues())>>
                : std::true_type
            {};
 
            template<typename T, typename = void>
            struct HasValidSize : std::false_type
            {};
 
            template<typename T>
            struct HasValidSize<T, Void<decltype(std::declval<typename std::decay<T>::type>().validSize())>>
                : std::true_type
            {};
        } // namespace Detail
#endif
 
        template<typename T>
        using IsDataModelType = typename Detail::IsDataModelType<T>::type;
 
        template<typename T>
        using IsDataModelLeaf = typename Detail::IsDataModelLeaf<T>::Type;
 
        template<typename T>
        struct IsOptional : Detail::IsOptional<T>
        {
            static_assert(IsDataModelLeaf<T>::value,
                          "The template parameter to IsOptional must be a data model leaf type");
        };
 
        template<typename T>
        struct HasValidRange : Detail::HasValidRange<T>
        {
            static_assert(IsDataModelLeaf<T>::value,
                          "The template parameter to HasValidRange must be a data model leaf type");
        };
 
        template<typename T>
        struct HasValidValues : Detail::HasValidValues<T>
        {
            static_assert(IsDataModelLeaf<T>::value,
                          "The template parameter to HasValidValues must be a data model leaf type");
        };
 
        template<typename T>
        struct HasValidSize : Detail::HasValidSize<T>
        {
            static_assert(IsDataModelLeaf<T>::value,
                          "The template parameter to HasValidSize must be a data model leaf type");
        };
 
    } // namespace DataModel
} // namespace Zivid