Function Overloading

C++ permits various functions of the similar name to be outlined, as long as these functions have various sets of parametric quantity (at least as far as their forms are had to do with). This capacity is referred as function overloading. When an overloaded function is referred as the C++ compiling program choose the proper function by canvassing the order,  number and forms of arguments in call. Function overloading is commonly employed to bring forth various functions of the same name that execute similar tasks but on various data forms

A function is overloaded when same name is given to various function. All the same, the two functions with the same name would vary at least in one of the following.

a) The number of parametric quantity

b) The data type of parametric quantity

c) The order of appearance

Function overloading or method overloading is a characteristic found in various programming languages such as C++, Ada,  D,   C#,Visual Basic .NET and Java, that permits producing various methods with the similar name which vary from each other in the type of the input and the outcome of the function. It is merely outlined as the power of one function to execute various tasks.

For illustration,  doTask(object O) and doTask()  are the  overloaded methods. To call the second one, an object must be passed as  parametric quantity, while on the contrary the erstwhile does not call for a parametric quantity, and is referred as with an vacate parametric quantity field. A common error would be to allot a default value to the object in the second method, which would outcome in an equivocal call error, as the compiling program would not acknowledge which of the two methods to employ.

Conventions in function overloading

ñ  The similar function name is employed for various instances of function call.

ñ  The overloaded function must vary either by the  data forms

It is a categorization of static polymorphism in which a function call is adjudicated employing the 'best match technique ', i.e., the function is adjudicated based upon the argument list. Method overloading is by and large linked with typed programming languages in a static manner which impose type checking in function calls. When overloading a method, programmer are make a number of various methods that encounter to have the similar name. It is adjudicated at compile time which of these methods are employed. Method overloading shall not be mixed up with forms of polymorphism where the castigate method is preferred at execute time, for illustration via virtual functions, rather than in a static manner.

Most of the time functions are overloaded when :

1.    Return type of the functions is the similar.

2.    Functions vary in function signature.

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