std::type_info::operator==,std::type_info::operator!= (3) - Linux Manuals

std::type_info::operator==,std::type_info::operator!=: std::type_info::operator==,std::type_info::operator!=

NAME

std::type_info::operator==,std::type_info::operator!= - std::type_info::operator==,std::type_info::operator!=

Synopsis

bool operator==( const type_info& rhs ) const;
bool operator!=( const type_info& rhs ) const;

Checks if the objects refer to the same types.

Parameters

rhs - another type information object to compare to

Return value

true if the comparison operation holds true, false otherwise

Example

// Run this code

  #include <iostream>
  #include <typeinfo>
  #include <string>
  #include <utility>

  class person
  {
    public:

     person(std::string&& n) : _name(n) {}
     virtual const std::string& name() const{ return _name; }

    private:

      std::string _name;
  };

  class employee : public person
  {
     public:

       employee(std::string&& n, std::string&& p) :
           person(std::move(n)), _profession(std::move(p)) {}

       const std::string& profession() const { return _profession; }

     private:

       std::string _profession;
  };

  void somefunc(const person& p)
  {
     if(typeid(employee) == typeid(p))
     {
        std::cout << p.name() << " is an employee ";
        auto& emp = dynamic_cast<const employee&>(p);
        std::cout << "who works in " << emp.profession() << '\n';
     }
  }

  int main()
  {
     employee paul("Paul","Economics");
     somefunc(paul);
  }

Output:

  Paul is an employee who works in Economics