Lecture11AM: C++ Warming Up and RGB class.

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C++ operator overloading.

Overload +, += operators on RGB class. The + operator adds two RGB objects componentwise.

The signature of the first two methods are

   RGB& operator+=(RGB const& rhs);      // Changes this object, so it is non-const method, and return reference to this object which is the result.
   RGB operator+(RGB const& rhs) const;  // No changes to this object, so it is a const method, and return an (temparary) object which is the result.

When you implement the second method, you should use the first one.

C++ exception handling.

Change the two index operators of RGB class to deal with color component overflow(>1.0). When you detect an overflow, throw an error message. In your main function, use try & catch blocks to try access the color component, and catch any error occured.

Having done above, you can go one step further-- This time dealing with index overflow, i.e., the given row or col value is not in the appropriate range.

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