C++ allows you to perform operator overloading. This is when you specify the exact behaviour of a operator when used on or between specific data types. For example, you may create a string object class String, and overload the addition (
+) operator so that when used on two string types like so
str1 + str2, it concatenates the strings together to produce a new string.
Operator overloading allows you to express statements in a more compact and readable form. Continuing with the above example, if operator overloading was not available, we would have to create a function called
String::Append(String & string2) and to perform the same action as above we would have to write
str1.Append(str), which is slightly more convoluted.
What Operators Can I Overload?
C++ allows you to overload most operators. In fact, because you can overload so many, it’s easier just to list the ones you can’t.
Operators you CAN’T overload:
.(member selection operator, note you can still override
.*(member selection with pointer to member operator)
?:(tenary conditional operator)
sizeof()(object size operator)
typeid()(object type info operator)
::(scope resolution operator)
Suitability For Embedded Systems
In my opinion, operator overloading is a perfectly O.K. technique to use on low-power microcontrollers. As long as you overload operators so that they make intuitive sense, and you are aware of the actual function calls taking place, I don’t see any reason why you should not embrace this powerful feature in an embedded context.
My String-Cpp library (which is designed for use on low-power microcontrollers) makes use of operator overloading so that you can add and compare strings with one another.
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