Initial commit

2019-11-15 12:59:38 +01:00
parent 40a414d210
commit b880c3ccde
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+Fig01_23.cpp - Using Comparable templates - Employee class example
+	
+	#include <iostream.h>
+        #include "vector.h"
+        #include "mystring.h"
+
+        class Employee
+        {
+          public:
+            void setValue( const string & n, double s )
+              { name = n; salary = s; }
+
+            void print( ostream & out ) const
+              { out << name << " (" << salary << ")"; }
+            bool operator< ( const Employee & rhs ) const
+              { return salary < rhs.salary; }
+
+            // Other general accessors and mutators, not shown
+          private:
+            string name;
+            double salary;
+        };
+
+          // Define an output operator for Employee
+        ostream & operator<< ( ostream & out, const Employee & rhs )
+        {
+            rhs.print( out );
+            return out;
+        }
+
+        /**
+         * Return the maximum item in array a.
+         * Assumes a.size( ) > 0.
+         * Comparable objects must provide
+         *   copy constructor, operator<, operator=
+         */
+        template <class Comparable>
+        const Comparable & findMax( const vector<Comparable> & a )
+        {
+/* 1*/      int maxIndex = 0;
+
+/* 2*/      for( int i = 1; i < a.size( ); i++ )
+/* 3*/          if( a[ maxIndex ] < a[ i ] )
+/* 4*/              maxIndex = i;
+/* 5*/      return a[ maxIndex ];
+        }
+
+        int main( )
+        {
+            vector<Employee> v( 3 );
+
+            v[0].setValue( "Bill Clinton", 200000.00 );
+            v[1].setValue( "Bill Gates", 2000000000.00 );
+            v[2].setValue( "Billy the Marlin", 60000.00 );
+            cout << findMax( v ) << endl;
+
+            return 0;
+        }