gtkradiant/libs/generic/callbackfwd.h

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#if !defined(INCLUDED_CALLBACKFWD_H)
#define INCLUDED_CALLBACKFWD_H
template<typename Return>
class Callback0;
typedef Callback0<void> Callback;
template<typename FirstArgument, typename Result = void>
class Callback1;
template<typename FirstArgument, typename SecondArgument, typename Result = void>
class Callback2;
template<typename FirstArgument, typename SecondArgument, typename ThirdArgument, typename Result = void>
class Callback3;
#endif