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How inheritance, encapsulation and polymorphism work in C++

May 20, 2009, 12:03 (5 Talkback[s])
(Other stories by Alexander Sandler)

[ Thanks to Alexander Sandler for this link. ]

"How overloading works

"Another thing that we have to take care of in C++ is how to distinguish between some_function() and some_class::some_function(). Or between some_class::some_function( int ) and some_class::some_function() I.e. what's the difference between two methods with the same name that receive different number and type of arguments? What is the difference between method and function that has same name?

"Obviously, out of linker, compiler and preprocessor, linker is the one that should be aware of the above difference. This is because we may have some_function() in some distant object file. Linker is the component that should find this distant function and interconnect the call to the function and the actual function. Linker uses function name as a unique identifier of the function.

"To make things work, g++ and any other modern compiler, mangles the name of the method/function and makes sure that:

1. Mangled method name includes name of the class it belongs to (if it belongs to any class).
2. Mangled method name includes number and type of arguments method receives.
3. Mangled method name includes namespace it belongs to."

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