61 lines
2.4 KiB
C++
61 lines
2.4 KiB
C++
#ifndef REFLECTIVE_RAPIDJSON_VERSIONING
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#define REFLECTIVE_RAPIDJSON_VERSIONING
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#include <c++utilities/misc/traits.h>
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namespace ReflectiveRapidJSON {
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#ifdef REFLECTIVE_RAPIDJSON_GENERATOR
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#define REFLECTIVE_RAPIDJSON_CAT_1(a, b) a##b
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#define REFLECTIVE_RAPIDJSON_CAT_2(a, b) REFLECTIVE_RAPIDJSON_CAT_1(a, b)
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#define REFLECTIVE_RAPIDJSON_AS_OF_VERSION(version) \
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static constexpr std::size_t REFLECTIVE_RAPIDJSON_CAT_2(rrjAsOfVersion, __COUNTER__) = version; \
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public
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#define REFLECTIVE_RAPIDJSON_UNTIL_VERSION(version) \
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static constexpr std::size_t REFLECTIVE_RAPIDJSON_CAT_2(rrjUntilVersion, __COUNTER__) = version; \
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public
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#else
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#define REFLECTIVE_RAPIDJSON_AS_OF_VERSION(version) public
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#define REFLECTIVE_RAPIDJSON_UNTIL_VERSION(version) public
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#endif
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#ifdef REFLECTIVE_RAPIDJSON_SHORT_MACROS
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#define as_of_version(version) REFLECTIVE_RAPIDJSON_AS_OF_VERSION(version)
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#define until_version(version) REFLECTIVE_RAPIDJSON_UNTIL_VERSION(version)
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#endif
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CPP_UTILITIES_TRAITS_DEFINE_TYPE_CHECK(IsVersioned, T::version);
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template <typename VersionType> struct VersionNotSupported {
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VersionType presentVersion = 0, maxVersion = 0;
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const char *record = nullptr;
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};
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template <typename Type, bool Condition = IsVersioned<Type>::value> struct Versioning {
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static constexpr auto enabled = false;
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};
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template <typename Type> struct Versioning<Type, true> {
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static constexpr auto enabled = Type::version != 0;
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static constexpr auto serializationDefault = Type::version;
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static constexpr auto maxSupported = Type::version;
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static constexpr auto applyDefault(decltype(serializationDefault) version)
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{
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return version ? version : serializationDefault;
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}
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static constexpr auto isSupported(decltype(maxSupported) version)
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{
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return version <= maxSupported;
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}
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static constexpr auto assertVersion(decltype(maxSupported) version, const char *record = nullptr)
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{
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if (!isSupported(version)) {
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throw typename Type::VersionNotSupported({ .presentVersion = version, .maxVersion = maxSupported, .record = record });
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}
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}
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};
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} // namespace ReflectiveRapidJSON
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#endif // REFLECTIVE_RAPIDJSON_TRAITS
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