📄 tele.cpp.html

📁 《Big C++ 》Third Edition电子书和代码全集-Part1
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<pre>  1  #include &lt;string&gt;
  2  #include &lt;iostream&gt;
  3  #include &lt;map&gt;
  4  
  5  using namespace std;
  6  
  <font color="#0000cc">7  /**
  8     TelephoneDirectory maintains a map of name/number pairs.
  9  */</font>
 10  class TelephoneDirectory 
 11  {
 12  public:
 <font color="#0000cc">13     /**
 14        Add a new name/number pair to database.
 15        @param name the new name
 16        @param number the new number
 17     */</font>
 18     void add_entry(string name, int number);
 19  
 <font color="#0000cc">20     /**
 21        Find the number associated with a name.
 22        @param name the name being searched
 23        @return the associated number, or zero 
 24        if not found in database
 25     */</font>
 26     int find_entry(string name) const;
 27  
 <font color="#0000cc">28     /**
 29        Print all entries on given output stream
 30        in name : number format ordered by name.
 31        @param out the output stream
 32     */</font>
 33     void print_all(ostream&amp; out) const;
 34  
 <font color="#0000cc">35     /**
 36        Print all entries on given output stream
 37        in number : name format ordered by number.
 38        @param out the output stream
 39     */</font>
 40     void print_by_number(ostream&amp; out) const;
 41  private:
 42     map&lt;string, int&gt; database;
 43     typedef map&lt;string, int&gt;::const_iterator iterator;
 44  };
 45  
 46  void TelephoneDirectory::add_entry(string name, int number)
 47  {
 48     database[name] = number;
 49  }
 50  
 51  int TelephoneDirectory::find_entry(string name) const
 52  {
 53     iterator p = database.find( name );
 54     if (p != database.end())
 55        return p-&gt;second;
 56     return 0; <font color="#000099">// not found</font>
 57  }
 58  
 59  void TelephoneDirectory::print_all(ostream&amp; out) const
 60  {
 61     iterator current = database.begin();
 62     iterator stop = database.end();
 63     while (current != stop)
 64     {
 65        out &lt;&lt; current-&gt;first &lt;&lt; " : " &lt;&lt; current-&gt;second &lt;&lt; "\n";
 66        ++current;
 67     }
 68  }
 69  
 70  void TelephoneDirectory::print_by_number(ostream&amp; out) const
 71  {
 72     multimap&lt;int, string&gt; inverse_database;
 73     typedef multimap&lt;int, string&gt;::iterator miterator;
 74     iterator current = database.begin();
 75     iterator stop = database.end();
 76     while (current != stop)
 77     {
 78        inverse_database.insert(
 79           multimap&lt;int, string&gt;::value_type(current-&gt;second, current-&gt;first));
 80        ++current;
 81     }
 82     miterator icurrent = inverse_database.begin();
 83     miterator istop = inverse_database.end();
 84     while (icurrent != istop)
 85     {
 86        cout &lt;&lt; icurrent-&gt;first &lt;&lt; " : " &lt;&lt; icurrent-&gt;second &lt;&lt; "\n";
 87        ++icurrent;
 88     }
 89  }
 90  
 91  int main()
 92  {
 93     TelephoneDirectory data;
 94     data.add_entry("Fred", 7235591);
 95     data.add_entry("Mary", 3841212);
 96     data.add_entry("Sarah", 3841212);
 97     cout &lt;&lt; "Number for Fred " &lt;&lt; data.find_entry("Fred") &lt;&lt; "\n";
 98     cout &lt;&lt; "Printing by name \n";
 99     data.print_all(cout);
100     cout &lt;&lt; "Printing by number \n";
101     data.print_by_number(cout);
102     return 0;
103  }</pre>
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