2006-04-24 01:14:18 +02:00
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#include <string>
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#include <list>
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#include <map>
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#include "SharedMemory.h"
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namespace AtlasMessage
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{
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struct Command
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{
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virtual ~Command() {}
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virtual void Do() = 0;
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virtual void Undo() = 0;
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virtual void Redo() = 0;
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virtual void Merge(Command* prev) = 0;
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virtual const char* GetType() const = 0;
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};
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class CommandProc
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{
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public:
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CommandProc();
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~CommandProc();
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// Should be called before shutting down, so it can free
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// references to entities/etc that are stored in commands
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void Destroy();
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void Submit(Command* cmd);
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void Undo();
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void Redo();
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void Merge();
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private:
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std::list<Command*> m_Commands;
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typedef std::list<Command*>::iterator cmdIt;
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cmdIt m_CurrentCommand;
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};
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typedef Command* (*cmdHandler)(const void*);
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typedef std::map<std::string, cmdHandler> cmdHandlers;
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extern cmdHandlers& GetCmdHandlers();
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CommandProc& GetCommandProc();
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struct DataCommand : public Command // so commands can optionally override (De|Con)struct
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{
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void Destruct() {};
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void Construct() {};
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// MergeWithSelf should be overriden by commands, and implemented
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// to update 'prev' to include the effects of 'this'
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void MergeWithSelf(void*) { debug_warn("MergeWithSelf unimplemented in some command"); }
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};
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#define BEGIN_COMMAND(t) \
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class c##t : public DataCommand \
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{ \
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d##t* d; \
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public: \
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c##t(d##t* data) : d(data) { Construct(); } \
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~c##t() { Destruct(); AtlasMessage::ShareableDelete(d); /* d was allocated by mDoCommand() */ } \
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static Command* Create(const void* data) { return new c##t ((d##t*)data); } \
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virtual void Merge(Command* prev) { MergeWithSelf((c##t*)prev); } \
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virtual const char* GetType() const { return #t; }
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#define END_COMMAND(t) \
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}; \
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namespace register_command_##t { \
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struct init { init() { \
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bool notAlreadyRegisted = GetCmdHandlers().insert(std::pair<std::string, cmdHandler>("c"#t, &c##t ::Create)).second; \
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debug_assert(notAlreadyRegisted); \
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} } init; \
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};
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}
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