CODEWITHSUNDEEP
c++classpointersvector
Pedro Machin
Pedro Machin

Reputation: 51

Populating a vector of class pointers within constructor

I've seen other posts regarding vectors to an pointer of class objects. However, is it possible to populate this vector inside the same class' constructor with the "this" pointer? I'm getting a linker error. Am I way off base?:

// Object.h
class Object
{
....
static vector<Object*> gObjects;
}

// Object.cpp
Object::Object()
{
  gObjects.push_back(this);
}

// Main.cpp
Object::gObjects.size()

Upvotes: 1

Views: 107

Answers (1)

Jonathan Wakely
Jonathan Wakely

Reputation: 171263

is it possible to populate this vector inside the same class' constructor with the "this" pointer?

Yes, it's possible.

The linker error has nothing to do with pointers or putting this in the vector, it's simply because you haven't defined the static member.

As explained at https://gcc.gnu.org/wiki/VerboseDiagnostics#missing_static_const_definition you need to declare and define static members.

To fix it just add this to Main.cpp:

std::vector<Object*> Object::gObjects;

Upvotes: 1

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