[英]How to make classes using each other
class A;
class B;
class A
{
public:
A(B * b) : b(b)
{
b->foo(this);
}
private:
B * b;
};
class B
{
public:
void foo(A *)
{}
};
Compiling this code gives me 编译这段代码给了我
incomplete-type.hpp: In constructor ‘A::A(B*)’:
incomplete-type.hpp:9:4: error: invalid use of incomplete type ‘class B’
b->foo(this);
^~
But I really need the classes to use each other via pointers. 但是我确实需要这些类通过指针相互使用。 How can I do this?
我怎样才能做到这一点?
Move the function definitions that actually use the other type to below, where both types are complete. 将实际使用其他类型的函数定义移到下面,这两种类型均已完成。
class A;
class B;
class A
{
public:
A(B * b);
private:
B * b;
};
class B
{
public:
void foo(A *)
{}
};
inline A::A(B * b) : b(b)
{
b->foo(this);
}
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