Using a template function as a template param in another function-CodePudding

I was wondering, how I can do the following in C ?

template <typename T>
T doSomething(T x, T y) {
  T result = /*do something*/;

  return result;
}

template <typename T , typename V> 
T doMore(**input doSomething as template**, V v){
  T result = doSomething<V>(v,0); 
  return result;
}

I am basically trying to use a template function with its template valuetype in another function as such, is there any way to do that?

CodePudding user response：

You cannot pass (the set of) function template as argument (you can pass specific instantiation though).

You might pass functor to solve your issue:

template <typename T>
T doSomething(T x, T y) {
  T result = /*do something*/;

  return result;
}

template <typename F, typename V> 
T doMore(F f, V v){
  T result = f(v, V{0}); 
  return result;
}

And then

doMore([](auto x, auto y){ return doSomething(x, y); }, 42);