When we write programs in C++, we create new functions and methods with (hopefully) descriptive names all the time. Names are important for us humans to understand code. But in the compiled machine code of our finished executables, they don’t play any role. The CPU doesn’t even know about them.

Whenever our program has loaded, all functions and methods are placed at specific memory addresses of the virtual address space assigned to the process of our running program. Whenever a function calls another function, it doesn’t call the name of the function but the address where the function is located in memory.

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