Thread: Is there a way to restrict template arguments ?

i.e... In this case.. can I restrict the template arguments to function pointers/objects ?

Code:

    template<typename F1,typename F2>
    void compare(F1 fp1,F2 fp2)
    {
        double t1,t2;
        clock_t ini = clock();
        fp1();
        clock_t fin = clock();
        t1 = double((fin - ini))/CLOCKS_PER_SEC;
        ini = clock();
        fp2();
        fin = clock();
        t2 = double((fin - ini))/CLOCKS_PER_SEC;        
        std::cout<<"First one took: "<<t1<<" seconds\n";
        std::cout<<"Second one took: "<<t2<<" seconds\n";
    }

You don't want to allow function objects?

Anyway, you are effectively restricting it to things that appear to be callable. If you want more than that, you need the concepts thing.

Originally Posted by manasij7479

Anyway.. what are "Concepts thing"s ?

A feature that was supposed to be included in the current version of C++, but then got ditched because the standard committee felt that it should be improved first. The Boost Concept Check Library is related to this.

Originally Posted by manasij7479

i.e... In this case.. can I restrict the template arguments to function pointers/objects ?

Since the code uses the arguments as if they were callable, if you pass something that isn't callable the thing won't compile, so I'm not sure what you are trying to prevent.