How to initialize a static field?

Question

OOP

Good afternoon.
There is a class agents, it has a static field
static graph general_graph;
Where graph is another class. This class has a fill() method - it reads a graph from a file.
Problem: I can't initialize a static variable with a graph object with the fill() method already executed without creating a global object.
outside the main function I write the following code:
graph agents::general_graph = *(new graph());
the code compiles without error, but how do you call the fill() method on initialization?

Answer 1

This class has a fill() method - it reads a graph from a file.

After all, your method is called somehow like this: ?.fill(<file_name>)?
A good option is to have an overloaded graph(<filename>) constructor that does the same as fill().