Re: simple class

From:

Victor Bazarov <v.bazarov@comcast.invalid>

Newsgroups:

comp.lang.c++

Date:

Fri, 09 May 2014 10:30:43 -0400

Message-ID:

<lkioqk$den$1@dont-email.me>

On 5/9/2014 10:02 AM, nvangogh wrote:

On 09/05/14 14:53, nvangogh wrote:

Hi,
I am reading c++ primer.

Exercise 7.4:
Write a class named person that represents the name and address of a
person. Use a string to hold each of these elements. Subsequent
exercises will incrementally add features to this class.

Exercise 7.5:
Provide operations in your person class to return the name and address.
Should these functions be const? Explain your choice.

So I have completed exercise 7.5 in this way:

// a class named person with operations

#include <string>

class Person
{
   std::string name() const { return first_name;}
   std::string addr() const { return address;}

  // data members
   std::string first_name;
   std::string address;
};

Is this correct?

Also what would the constructors for this class look like?

Consider "Subsequent exercises will incrementally add features...", and
you might find out [later] how the class is to be used, which will
suggest the interface for constructing objects of that class.

The common approach is to provide a constructor that takes two
arguments, each a ref to a const std::string, from which the respective
data member shall be constructed.

*Similar* to a point in two dimensions:

    class Point {
       ...
       Point(double x, double y) : mem_x(x), mem_y(y) {}
       ...
    };

(note that the Point c-tor's args are passed by value).

V
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