Selecting an optimal operator for a template parameter

Imagine that we are working with classes from different vendors that implement different numbers of arithmetic operations and have constructors from integers. We do want to make a function that increments by any one class that is passed to it. Also, we want this function to be effective! Take a look at the following code:

template <class T> 
void inc(T& value) { 
    // TODO:
    // call ++value 
    // or call value ++ 
    // or value += T(1); 
    // or value = value + T(1); 
}

Getting ready

Some basic knowledge of the C++ templates, and the Boost.TypeTrait or standard library type traits is required.

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