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Two operators = and & are already overloaded by default in C++. For example, to copy objects of the same class, we can directly use the = operator. We do not need to create an operator function. Operator overloading cannot change the precedence and associativity of operators.
Polymorphism: Polymorphism (or operator overloading) is a manner in which OO systems allow the same operator name or symbol to be used for multiple operations. That is, it allows the operator symbol or name to be bound to more than one implementation of the operator. A simple example of this is the “+” sign.
An overloaded operator is called an operator function. You declare an operator function with the keyword operator preceding the operator. Overloaded operators are distinct from overloaded functions, but like overloaded functions, they are distinguished by the number and types of operands used with the operator.
This means C++ has the ability to provide the operators with a special meaning for a data type, this ability is known as operator overloading. For example, we can overload an operator '+' in a class like String so that we can concatenate two strings by just using +.
C does not support operator overloading (beyond what it built into the language).
There is no operator overloading in C.
You need a time machine to take you back to 1985, so that you may use the program CFront. It appears that 'C' use to support operator overloading; to the sophisticated enough it still can. See Inside the C++ Object Model by Stanley B. Lippman. OMG, C++ was C! Such a thing still exists.
This answer confirms the others. 'C' by itself does not directly support overloading. However, the important point is a programmer can write code that understands code. You need a tool that transforms source to implement this. In this case, such tools already exist.
A paper, Meta-Compilation for C++, 2001 by Edward D. Willink has interesting examples of design functionality, where extending a language is useful. The combination of *nix shell script and make rules often allow such transformation. Other examples are Qt MOC, the tools Lex and Yacc, halide etc. So while 'C' itself doesn't accommodate this directly, it does if you build host tools.
In this particular example the overloading may not make sense. However, it could make a lot of sense for a program needing arbitrary precision math.
You cannot overload these operators in C.
C does not support operator overloading at all.
You can only implement operations as functions:
Colour colour_add(Colour c1, Colour c2);
Colour colour_substract(Colour c1, Colour c2);
...
You could also switch to C++, but it may be overkill to do it just for the overloading.
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