How to write function template in c++ ?

Question

Please provide some example for each .

Answer 1

Function templates means family of functions which can be used based on the data type -

Syntax
template < parameters > declaration

Sample Code

#include <iostream>

template<typename T>
void f(T s)
{
    std::cout << s;
}

int main()
{
    f<double>(1); // calls f<double>(double)
    f<>('a'); // calls f<char>(char)
    f(7); // calls f<int>(int)
    void (*ptr)(std::string) = f; // calls f<string>(string)
}