better example
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278
include/sp/protocol/MessageBase.h
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278
include/sp/protocol/MessageBase.h
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#pragma once
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#include <sp/protocol/Message.h>
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#include <sp/protocol/Templates.h>
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namespace sp {
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namespace option {
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// Provide static numeric ID, to facilitate implementation of GetIdImpl()
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template <std::intmax_t TId>
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struct StaticNumIdImpl {};
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// Facilitate implementation of DispatchImpl()
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template <typename TActual>
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struct DispatchImpl {};
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// Provide fields of the message, facilitate implementation of
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// ReadImpl(), WriteImpl(), ValidImpl(), etc...
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template <typename TFields>
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struct FieldsImpl {};
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} // namespace option
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template <typename... TOptions>
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class MessageImplParsedOptions;
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template <>
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struct MessageImplParsedOptions<> {
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static const bool HasStaticNumIdImpl = false;
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static const bool HasDispatchImpl = false;
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static const bool HasFieldsImpl = false;
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};
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template <std::intmax_t TId, typename... TOptions>
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struct MessageImplParsedOptions<option::StaticNumIdImpl<TId>, TOptions...> : public MessageImplParsedOptions<TOptions...> {
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static const bool HasStaticNumIdImpl = true;
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static const std::intmax_t MsgId = TId;
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};
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template <typename TActual, typename... TOptions>
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struct MessageImplParsedOptions<option::DispatchImpl<TActual>, TOptions...> : public MessageImplParsedOptions<TOptions...> {
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static const bool HasDispatchImpl = true;
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using ActualMessage = TActual;
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};
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template <typename TFields, typename... TOptions>
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struct MessageImplParsedOptions<option::FieldsImpl<TFields>, TOptions...> : public MessageImplParsedOptions<TOptions...> {
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static const bool HasFieldsImpl = true;
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using Fields = TFields;
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};
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// ID information chunk
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template <typename TBase, std::intmax_t TId>
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class MessageImplStaticNumIdBase : public TBase {
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public:
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// Reuse the message ID type defined in the interface
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using MsgIdType = typename TBase::MsgIdType;
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protected:
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virtual MsgIdType GetIdImpl() const override {
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return static_cast<MsgIdType>(TId);
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}
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};
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// Dispatch implementation chunk
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template <typename TBase, typename TActual>
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class MessageImplDispatchBase : public TBase {
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public:
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// Reuse the Handler type defined in the interface class
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using Handler = typename TBase::HandlerType;
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protected:
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virtual void DispatchImpl(Handler& handler) override {
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handler.Handle(static_cast<TActual&>(*this));
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}
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};
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template <typename TBase, typename TFields>
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class MessageImplFieldsBase : public TBase {
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public:
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using AllFields = TFields;
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AllFields& GetFields() {
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return m_Fields;
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}
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const AllFields& GetFields() const {
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return m_Fields;
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}
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template<std::size_t FIndex>
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auto& GetField() {
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return std::get<FIndex>(GetFields()).GetValue();
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}
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private:
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TFields m_Fields;
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};
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template <typename TBase>
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class MessageImplFieldsReadBase : public TBase {
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protected:
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void ReadImpl(DataBuffer& buffer) override {
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//TODO: add endianess
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auto& allFields = TBase::GetFields();
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tupleForEach(allFields, FieldReader{buffer});
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}
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};
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template <typename TBase>
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class MessageImplFieldsWriteBase : public TBase {
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protected:
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void WriteImpl(DataBuffer& buffer) override {
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//TODO: add endianess
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auto& allFields = TBase::GetFields();
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tupleForEach(allFields, FieldWriter{buffer});
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}
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};
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template <typename TBase>
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class MessageImplFieldsValidBase : public TBase {
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protected:
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bool ValidImpl() const override {
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// Access fields via interface provided in previous chunk
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// auto& allFields = TBase::GetFields();
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//... // validate all the fields
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}
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};
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// id impl
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template <typename TBase, typename ParsedImplOptions, bool TImplement>
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struct MessageImplProcessStaticNumId;
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template <typename TBase, typename ParsedImplOptions>
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struct MessageImplProcessStaticNumId<TBase, ParsedImplOptions, true> {
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using Type = MessageImplStaticNumIdBase<TBase, ParsedImplOptions::MsgId>;
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};
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template <typename TBase, typename ParsedImplOptions>
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struct MessageImplProcessStaticNumId<TBase, ParsedImplOptions, false> {
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using Type = TBase;
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};
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// dispatch impl
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template <typename TBase, typename ParsedImplOptions, bool TImplement>
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struct MessageImplProcessDispatch;
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template <typename TBase, typename ParsedImplOptions>
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struct MessageImplProcessDispatch<TBase, ParsedImplOptions, true> {
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using Type = MessageImplDispatchBase<TBase, typename ParsedImplOptions::ActualMessage>;
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};
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template <typename TBase, typename ParsedImplOptions>
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struct MessageImplProcessDispatch<TBase, ParsedImplOptions, false> {
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using Type = TBase;
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};
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// fields impl
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template <typename TBase, typename ParsedImplOptions, bool TImplement>
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struct MessageImplProcessFields;
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template <typename TBase, typename ParsedImplOptions>
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struct MessageImplProcessFields<TBase, ParsedImplOptions, true> {
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using Type = MessageImplFieldsBase<TBase, typename ParsedImplOptions::Fields>;
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};
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template <typename TBase, typename ParsedImplOptions>
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struct MessageImplProcessFields<TBase, ParsedImplOptions, false> {
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using Type = TBase;
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};
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// read impl
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template <typename TBase, bool TImplement>
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struct MessageImplProcessReadFields;
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template <typename TBase>
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struct MessageImplProcessReadFields<TBase, true> {
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using Type = MessageImplFieldsReadBase<TBase>;
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};
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template <typename TBase>
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struct MessageImplProcessReadFields<TBase, false> {
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using Type = TBase;
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};
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// write impl
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template <typename TBase, bool TImplement>
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struct MessageImplProcessWriteFields;
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template <typename TBase>
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struct MessageImplProcessWriteFields<TBase, true> {
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using Type = MessageImplFieldsWriteBase<TBase>;
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};
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template <typename TBase>
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struct MessageImplProcessWriteFields<TBase, false> {
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using Type = TBase;
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};
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// valid impl
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template <typename TBase, bool TImplement>
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struct MessageImplProcessValidFields;
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template <typename TBase>
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struct MessageImplProcessValidFields<TBase, true> {
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using Type = MessageImplFieldsValidBase<TBase>;
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};
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template <typename TBase>
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struct MessageImplProcessValidFields<TBase, false> {
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using Type = TBase;
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};
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// TBase is interface class
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// TOptions... are the implementation options
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template <typename TBase, typename... TOptions>
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struct MessageImplBuilder {
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// ParsedOptions class is supposed to be defined in comms::Message class
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using InterfaceOptions = typename TBase::ParsedOptions;
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// Parse implementation options
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using ImplOptions = MessageImplParsedOptions<TOptions...>;
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// Provide GetIdImpl() if possible
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static const bool HasStaticNumIdImpl = InterfaceOptions::HasMsgIdType && ImplOptions::HasStaticNumIdImpl;
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using Base1 = typename MessageImplProcessStaticNumId<TBase, ImplOptions, HasStaticNumIdImpl>::Type;
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// Provide DispatchImpl() if possible
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static const bool HasDispatchImpl = InterfaceOptions::HasHandler && ImplOptions::HasDispatchImpl;
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using Base2 = typename MessageImplProcessDispatch<Base1, ImplOptions, HasDispatchImpl>::Type;
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// Provide access to fields if possible
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using Base3 = typename MessageImplProcessFields<Base2, ImplOptions, ImplOptions::HasFieldsImpl>::Type;
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// Provide ReadImpl() if possible
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static const bool HasReadImpl = InterfaceOptions::HasReadOperations && ImplOptions::HasFieldsImpl;
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using Base4 = typename MessageImplProcessReadFields<Base3, HasReadImpl>::Type;
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// Provide WriteImpl() if possible
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static const bool HasWriteImpl = InterfaceOptions::HasWriteOperations && ImplOptions::HasFieldsImpl;
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using Base5 = typename MessageImplProcessWriteFields<Base4, HasWriteImpl>::Type;
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// Provide ValidImpl() if possible
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static const bool HasValidImpl = InterfaceOptions::HasValid && ImplOptions::HasFieldsImpl;
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using Base6 = typename MessageImplProcessValidFields<Base5, HasValidImpl>::Type;
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// The last BaseN must be taken as final type.
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using Type = Base6;
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};
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template <typename TBase, typename... TOptions>
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class MessageBase : public MessageImplBuilder<TBase, TOptions...>::Type {};
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} // namespace sp
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