Template Return Type

[Gobi Sakthivel]

class xxx
{
    public:
    template<class T>
     T void func(int a)
     {
        /* Here depending upon some-cases, i ll return                                       
         * either int, float, std::string, etc...
         * How to do it, i am getting undefined refernce  
         * to func
         */
    }
};

[weaknessforcats]

Firstly, this code:

T void func(int a)...

shows a function with two return types. This won't work.

Also, assume you have two func() functions generated from your template and one returns an int and the other returns a float. Then you code:

func(32);

So does the compiler call func() that returns an int or func() that returns a float?

The compiler won't guess. Instead it crashes the build with "indetermin ate behavior" and lets you figure out exactly what to do.

Because of this scenario, function overloading in C++ does not apply to the return type only.