I am attempting to create a poptart vending machine program and am getting an error in relation to what i think is a pointer. When the code is on the screen, i am not getting an issue however, when i attempt to build the code i get an error saying 'Syntax error: missing ';' before '*''
Code:
class State: public Transition
{
protected:
StateContext* currentContext;
public:
State(StateContext* Context);
};
Any suggestions would be appreciated. Cheers
(Occasionally the C++ compile error messages can be a little cryptic).
You need to forward declare the class StateContext. Before your class declaration, include the line
class StateContext;
Then in the implementation of State, make sure that the class declaration of StateContext is included.
You need to include definition of StateContext or forward declare the class StateContext and add header in implementation file:
#include "StateContext.h"
class State: public Transition
{
protected:
StateContext* currentContext;
public:
State(StateContext* Context);
};
or:
class StateContext;
class State: public Transition
{
protected:
StateContext* currentContext;
public:
State(StateContext* Context);
};
Forward declaration allows you to use a pointers or references to class being forwarded without including a header for this class as long as you don't call any method (or use its data) on such a pointer or reference.
StateContext?