// A.h file
class A
{
B * b;
b->fun();
public:
//stuff
}
// B.h
class B
{
A * a;
public:
a->fun();
//stuff
}
forwarding declaration
Author
A* a;a->fun();The above requires the definition of A to be available. What is usually done is only keep the A* a; part in the header file, and move the second line to a source file. This way, you can use a forward declaration to make the header self-sustaining, and include all definitions in the source file to make it compile.
The compiler does not need the full class declaration to make a pointer to it.
Therefore, you can solve your cyclical dependency like so:
Therefore, you can solve your cyclical dependency like so:
// In ClassA.h:// Use a forward declaration to tell the compiler B is a typeclass B;class A { B* b;};// In ClassA.cpp:#include "ClassA.h"#include "ClassB.h"// somewhere later on...b->fun();This topic is closed to new replies.
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