CODEWITHSUNDEEP
c++clinker
hatemelseidy
hatemelseidy

Reputation: 166

"Undefined struct" error when creating an object

I'm working on a C++ project which links to a C library. My C++ class is as follows:

extern "C" {
    struct __struct1__;
    struct __struct2__;
    struct __struct3__;
    struct __struct4__;
}

namespace mynamespace {
   class MyClass : public Parent {
     public:
          ....

     private:
          ....

          __struct1__* s1;
          __struct2__* s2;
          struct __struct3__ s3;
          struct __struct4__ s4;
   };
}

When creating pointers like s1 and s2, everything is OK. But objects don't work well. The following error is generated:

Error using undefined struct

How can I create objects like s3 and s4?

Upvotes: 0

Views: 521

Answers (1)

zoska
zoska

Reputation: 1723

Variable:

__struct1__ *s1

is just of type pointer (to your structure, but still just a pointer), so compiler knows exactly how much memory on stack this variable needs. But in case of:

__struct3__ s3

this variable is of type __struct3__, so without whole definition compiler does not know its size.

Upvotes: 2

Related Questions