TAILIEUCHUNG - Thinking in C plus plus (P8)

Tham khảo tài liệu 'thinking in c plus plus (p8)', công nghệ thông tin, kỹ thuật lập trình phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | class X void f the function f inside the scope of class X does not clash with the global version of f . The compiler performs this scoping by manufacturing different internal names for the global version of f and X f In Chapter 4 it was suggested that the names are simply the class name decorated together with the function name so the internal names the compiler uses might be _f and _X_f However it turns out that function name decoration involves more than the class name. Here s why. Suppose you want to overload two function names void print char void print float It doesn t matter whether they are both inside a class or at the global scope. The compiler can t generate unique internal identifiers if it uses only the scope of the function names. You d end up with _print in both cases. The idea of an overloaded function is that you use the same function name but different argument lists. Thus for overloading to work the compiler must decorate the function name with the names of the argument types. The functions above defined at global scope produce internal names that might look something like _print_charand _print_float It s worth noting there is no standard for the way names must be decorated by the compiler so you will see very different results from one compiler to another. You can see what it looks like by telling the compiler to generate assembly-language output. This of course causes problems if you want to buy compiled libraries for a particular compiler and linker - but even if name decoration were standardized there would be other roadblocks because of the way different compilers generate code. That s really all there is to function overloading you can use the same function name for different functions as long as the argument lists are different. The compiler decorates the name the scope and 330 Thinking in C www. BruceEckel .com the argument lists to produce internal names for it and the linker to use. Overloading on return values It s common to wonder Why

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