C++ template function default value

Question

Is it possible to define the default value for variables of a template function in C++?

Something like below:

template T sum(T a, T b,         


        

Answer 1

Yes you can define a default value.

template  
T constructThird()
{
    return T(1);
}

template  
T test(T a, 
       T b, 
       T c = constructThird())
{
    return a + b + c;
}

Unfortunately constructThird cannot take a and b as arguments.