Forward declaration in Managed C++

  • Thread starter Thread starter shree kame
  • Start date Start date
S

shree kame

I have a managed class A and inside A, I'm declaring an object of class
B. B has been forward declared.

Namespace X::Y::Z
{
__gc class B;

__gc class A
{
public:
A()
{
B *b = new B();
}

};

__gc class B
{
public:
B( )
{
}
};
}

The compiler complains
'X::Y::Z::A::B' : no appropriate default constructor available

Any clues??
Thanks
shree
 
shree,

I have a managed class A and inside A, I'm declaring an object of class
B. B has been forward declared.

Namespace X::Y::Z
{
__gc class B;

__gc class A
{
public:
A()
{
B *b = new B();
}

};

__gc class B
{
public:
B( )
{
}
};
}

The compiler complains
'X::Y::Z::A::B' : no appropriate default constructor available

Any clues??
Click to expand...


First of all, this is not the appropriate group for these questions.
Instead, try the microsoft.public.dotnet.languages.vc group (followups set
accordingly).

As for the answer: the compiler is right. The problem is that you're
defining A's constructor inline, so at the point you're using B::B(), it has
indeed not been defined yet. Remember that C++ does compilation pretty much
module by module.

Obviously, the easy answer is *not* to define A::A() inline....
 
Back
Top