forked from 0ad/0ad
59 lines
1.3 KiB
C++
59 lines
1.3 KiB
C++
#include <list>
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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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};
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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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void Submit(Command* cmd);
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void Undo();
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void Redo();
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private:
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std::list<Command*> m_Commands;
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std::list<Command*>::iterator 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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class 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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};
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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(); delete d; } \
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static Command* Create(const void* data) { return new c##t((d##t*)data); }
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#define END_COMMAND(t) \
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}; \
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namespace CAT2(hndlr_, __LINE__) { 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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assert(notAlreadyRegisted); \
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} } init; };
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} |