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Templates

• A class template is a mechanism that allows us to create classes whose data fields have arbitrary type.
• We have already seen an example: the vector template.

  vector<int> v_i; 
  vector<double> v_d;
  vector<Employee> v_e;
  

• To define a template, denote the arbitrary type with a type parameter as show in syntax 17.3 (next slide), and add the line template<typename T> before the class definition.

  template<typename T>
  class Pair
  {
  public:
     Pair(T a, T b);
     T get_first() const;
     T get_second() const;
  private:
     T first;
     T second;
  };
  

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