C++ Read and write multiple objects of same class

Question

airport air(1,2,3); //an airport constructor
ofstream myfile;
myfile.open("rishab",ios::app||ios::binary);
myfile.write((char*)air,sizeof(airport);
myfile.close();

Such commands are called multiple times in my program to get info of many airports. Basically the binary file is full of airports. I need to read all these airports into an array later on. How do I read the file so that I get the array of airports.

Apologies if this question is too basic. I am in high school learning about pointers and shortest path graphs.

Answer 1

Well, if you're sure that your file is valid, then you can simply use read() until you reach EOF. Each read() - of sizeof(airport)- will give you a valid airport object.

Note that storing the binary "value" of and object will result in an invalid object when loading it if it contains pointers - or references.

EDIT: myfile.write((char*)&air,sizeof(airport); will write the content of the air object the file. By doing this, you're actually writing the object, not the pointer.