need help assigning variable to shared pointer

[Programmy]

I'm using a shared pointer but I'm having trouble using push_back assigning a value to a vector of shared pointers
how do you go about doing it?

void Window::Test1(std::vector<std::shared_ptr<Earth>>* proxy3)
{
   int *a ;
   int b = 10;

   int *a = &b;

   std::vector<std::shared_ptr<Earth>> proxy4;

   proxy3 = &proxy4;

}

[eXpl0it3r]

This is the SFML forum, general C++ questions are better asked on platforms like StackOverflow.

Probably something alone the line of: vec.push_back(std::make_shared<Earth>());