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In some programming languages, function overloading or method overloading is the ability to create multiple functions of the same name with different implementations. Calls to an overloaded function will run a specific implementation of that function appropriate to the context of the call, allowing one function call to perform different tasks ...
When T has the nested type foobar defined, the instantiation of the first test works and the null pointer constant is successfully passed. (And the resulting type of the expression is yes.) If it does not work, the only available function is the second test, and the resulting type of the expression is no. An ellipsis is used not only because it ...
This is because the definition of function overloading only accounts for the function name, parameter type list and the enclosing namespace (if any). It does not account for the return type. [4] However, these functions can still be called by explicitly indicating the signature to the compiler, as demonstrated by the following program.
The problem is that, while virtual functions are dispatched dynamically in C++, function overloading is done statically. The problem described above can be resolved by simulating double dispatch, for example by using a visitor pattern. Suppose the existing code is extended so that both SpaceShip and ApolloSpacecraft are given the function
C++ uses function overloading with various signatures. The practice of multiple inheritance requires consideration of the function signatures to avoid unpredictable results. Computer science theory, and the concept of polymorphism in particular, make much use of the concept of function signature.
32-bit compilers emit, respectively: _f _g@4 @h@4 In the stdcall and fastcall mangling schemes, the function is encoded as _name@X and @name@X respectively, where X is the number of bytes, in decimal, of the argument(s) in the parameter list (including those passed in registers, for fastcall).
Here is an example of overloading in C++, two functions Area that accept different types: // returns the area of a rectangle defined by height and width double Area ( double h , double w ) { return h * w ; } // returns the area of a circle defined by radius double Area ( double r ) { return r * r * 3.14 ; } int main () { double rectangle_area ...
The act of creating such alternative functions for compile time selection is usually referred to as overloading a function. In programming languages that defer data type identification until run time (i.e., late binding), selection among alternative functions must occur then, based on the dynamically determined types of function arguments.