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              <font color=#0000ff>const</font> Integer&amp; right);
  <font color=#0000ff>friend</font> <font color=#0000ff>const</font> Integer
    <font color=#0000ff>operator</font>&lt;&lt;(<font color=#0000ff>const</font> Integer&amp; left,
               <font color=#0000ff>const</font> Integer&amp; right);
  <font color=#0000ff>friend</font> <font color=#0000ff>const</font> Integer
    <font color=#0000ff>operator</font>&gt;&gt;(<font color=#0000ff>const</font> Integer&amp; left,
               <font color=#0000ff>const</font> Integer&amp; right);
  <font color=#009900>// Assignments modify &amp; return lvalue:</font>
  <font color=#0000ff>friend</font> Integer&amp;
    <font color=#0000ff>operator</font>+=(Integer&amp; left,
               <font color=#0000ff>const</font> Integer&amp; right);
  <font color=#0000ff>friend</font> Integer&amp;
    <font color=#0000ff>operator</font>-=(Integer&amp; left,
               <font color=#0000ff>const</font> Integer&amp; right);
  <font color=#0000ff>friend</font> Integer&amp;
    <font color=#0000ff>operator</font>*=(Integer&amp; left,
               <font color=#0000ff>const</font> Integer&amp; right);
  <font color=#0000ff>friend</font> Integer&amp;
    <font color=#0000ff>operator</font>/=(Integer&amp; left,
               <font color=#0000ff>const</font> Integer&amp; right);
  <font color=#0000ff>friend</font> Integer&amp;
    <font color=#0000ff>operator</font>%=(Integer&amp; left,
               <font color=#0000ff>const</font> Integer&amp; right);
  <font color=#0000ff>friend</font> Integer&amp;
    <font color=#0000ff>operator</font>^=(Integer&amp; left,
               <font color=#0000ff>const</font> Integer&amp; right);
  <font color=#0000ff>friend</font> Integer&amp;
    <font color=#0000ff>operator</font>&amp;=(Integer&amp; left,
               <font color=#0000ff>const</font> Integer&amp; right);
  <font color=#0000ff>friend</font> Integer&amp;
    <font color=#0000ff>operator</font>|=(Integer&amp; left,
               <font color=#0000ff>const</font> Integer&amp; right);
  <font color=#0000ff>friend</font> Integer&amp;
    <font color=#0000ff>operator</font>&gt;&gt;=(Integer&amp; left,
                <font color=#0000ff>const</font> Integer&amp; right);
  <font color=#0000ff>friend</font> Integer&amp;
    <font color=#0000ff>operator</font>&lt;&lt;=(Integer&amp; left,
                <font color=#0000ff>const</font> Integer&amp; right);
  <font color=#009900>// Conditional operators return true/false:</font>
  <font color=#0000ff>friend</font> <font color=#0000ff>int</font>
    <font color=#0000ff>operator</font>==(<font color=#0000ff>const</font> Integer&amp; left,
               <font color=#0000ff>const</font> Integer&amp; right);
  <font color=#0000ff>friend</font> <font color=#0000ff>int</font>
    <font color=#0000ff>operator</font>!=(<font color=#0000ff>const</font> Integer&amp; left,
               <font color=#0000ff>const</font> Integer&amp; right);
  <font color=#0000ff>friend</font> <font color=#0000ff>int</font>
    <font color=#0000ff>operator</font>&lt;(<font color=#0000ff>const</font> Integer&amp; left,
              <font color=#0000ff>const</font> Integer&amp; right);
  <font color=#0000ff>friend</font> <font color=#0000ff>int</font>
    <font color=#0000ff>operator</font>&gt;(<font color=#0000ff>const</font> Integer&amp; left,
              <font color=#0000ff>const</font> Integer&amp; right);
  <font color=#0000ff>friend</font> <font color=#0000ff>int</font>
    <font color=#0000ff>operator</font>&lt;=(<font color=#0000ff>const</font> Integer&amp; left,
               <font color=#0000ff>const</font> Integer&amp; right);
  <font color=#0000ff>friend</font> <font color=#0000ff>int</font>
    <font color=#0000ff>operator</font>&gt;=(<font color=#0000ff>const</font> Integer&amp; left,
               <font color=#0000ff>const</font> Integer&amp; right);
  <font color=#0000ff>friend</font> <font color=#0000ff>int</font>
    <font color=#0000ff>operator</font>&amp;&amp;(<font color=#0000ff>const</font> Integer&amp; left,
               <font color=#0000ff>const</font> Integer&amp; right);
  <font color=#0000ff>friend</font> <font color=#0000ff>int</font>
    <font color=#0000ff>operator</font>||(<font color=#0000ff>const</font> Integer&amp; left,
               <font color=#0000ff>const</font> Integer&amp; right);
  <font color=#009900>// Write the contents to an ostream:</font>
  <font color=#0000ff>void</font> print(std::ostream&amp; os) <font color=#0000ff>const</font> { os &lt;&lt; i; }
}; 
#endif <font color=#009900>// INTEGER_H ///:~</font></PRE></FONT></BLOCKQUOTE>


<BLOCKQUOTE><FONT SIZE = "+1"><PRE><font color=#009900>//: C12:Integer.cpp {O}</font>
<font color=#009900>// Implementation of overloaded operators</font>
#include <font color=#004488>"Integer.h"</font>
#include <font color=#004488>"../require.h"</font>

<font color=#0000ff>const</font> Integer
  <font color=#0000ff>operator</font>+(<font color=#0000ff>const</font> Integer&amp; left,
            <font color=#0000ff>const</font> Integer&amp; right) {
  <font color=#0000ff>return</font> Integer(left.i + right.i);
}
<font color=#0000ff>const</font> Integer
  <font color=#0000ff>operator</font>-(<font color=#0000ff>const</font> Integer&amp; left,
            <font color=#0000ff>const</font> Integer&amp; right) {
  <font color=#0000ff>return</font> Integer(left.i - right.i);
}
<font color=#0000ff>const</font> Integer
  <font color=#0000ff>operator</font>*(<font color=#0000ff>const</font> Integer&amp; left,
            <font color=#0000ff>const</font> Integer&amp; right) {
  <font color=#0000ff>return</font> Integer(left.i * right.i);
}
<font color=#0000ff>const</font> Integer
  <font color=#0000ff>operator</font>/(<font color=#0000ff>const</font> Integer&amp; left,
            <font color=#0000ff>const</font> Integer&amp; right) {
  require(right.i != 0, <font color=#004488>"divide by zero"</font>);
  <font color=#0000ff>return</font> Integer(left.i / right.i);
}
<font color=#0000ff>const</font> Integer
  <font color=#0000ff>operator</font>%(<font color=#0000ff>const</font> Integer&amp; left,
            <font color=#0000ff>const</font> Integer&amp; right) {
  require(right.i != 0, <font color=#004488>"modulo by zero"</font>);
  <font color=#0000ff>return</font> Integer(left.i % right.i);
}
<font color=#0000ff>const</font> Integer
  <font color=#0000ff>operator</font>^(<font color=#0000ff>const</font> Integer&amp; left,
            <font color=#0000ff>const</font> Integer&amp; right) {
  <font color=#0000ff>return</font> Integer(left.i ^ right.i);
}
<font color=#0000ff>const</font> Integer
  <font color=#0000ff>operator</font>&amp;(<font color=#0000ff>const</font> Integer&amp; left,
            <font color=#0000ff>const</font> Integer&amp; right) {
  <font color=#0000ff>return</font> Integer(left.i &amp; right.i);
}
<font color=#0000ff>const</font> Integer
  <font color=#0000ff>operator</font>|(<font color=#0000ff>const</font> Integer&amp; left,
            <font color=#0000ff>const</font> Integer&amp; right) {
  <font color=#0000ff>return</font> Integer(left.i | right.i);
}
<font color=#0000ff>const</font> Integer
  <font color=#0000ff>operator</font>&lt;&lt;(<font color=#0000ff>const</font> Integer&amp; left,
             <font color=#0000ff>const</font> Integer&amp; right) {
  <font color=#0000ff>return</font> Integer(left.i &lt;&lt; right.i);
}
<font color=#0000ff>const</font> Integer
  <font color=#0000ff>operator</font>&gt;&gt;(<font color=#0000ff>const</font> Integer&amp; left,
             <font color=#0000ff>const</font> Integer&amp; right) {
  <font color=#0000ff>return</font> Integer(left.i &gt;&gt; right.i);
}
<font color=#009900>// Assignments modify &amp; return lvalue:</font>
Integer&amp; <font color=#0000ff>operator</font>+=(Integer&amp; left,
                    <font color=#0000ff>const</font> Integer&amp; right) {
   <font color=#0000ff>if</font>(&amp;left == &amp;right) {<font color=#009900>/* self-assignment */</font>}
   left.i += right.i;
   <font color=#0000ff>return</font> left;
}
Integer&amp; <font color=#0000ff>operator</font>-=(Integer&amp; left,
                    <font color=#0000ff>const</font> Integer&amp; right) {
   <font color=#0000ff>if</font>(&amp;left == &amp;right) {<font color=#009900>/* self-assignment */</font>}
   left.i -= right.i;
   <font color=#0000ff>return</font> left;
}
Integer&amp; <font color=#0000ff>operator</font>*=(Integer&amp; left,
                    <font color=#0000ff>const</font> Integer&amp; right) {
   <font color=#0000ff>if</font>(&amp;left == &amp;right) {<font color=#009900>/* self-assignment */</font>}
   left.i *= right.i;
   <font color=#0000ff>return</font> left;
}
Integer&amp; <font color=#0000ff>operator</font>/=(Integer&amp; left,
                    <font color=#0000ff>const</font> Integer&amp; right) {
   require(right.i != 0, <font color=#004488>"divide by zero"</font>);
   <font color=#0000ff>if</font>(&amp;left == &amp;right) {<font color=#009900>/* self-assignment */</font>}
   left.i /= right.i;
   <font color=#0000ff>return</font> left;
}
Integer&amp; <font color=#0000ff>operator</font>%=(Integer&amp; left,
                    <font color=#0000ff>const</font> Integer&amp; right) {
   require(right.i != 0, <font color=#004488>"modulo by zero"</font>);
   <font color=#0000ff>if</font>(&amp;left == &amp;right) {<font color=#009900>/* self-assignment */</font>}
   left.i %= right.i;
   <font color=#0000ff>return</font> left;
}
Integer&amp; <font color=#0000ff>operator</font>^=(Integer&amp; left,
                    <font color=#0000ff>const</font> Integer&amp; right) {
   <font color=#0000ff>if</font>(&amp;left == &amp;right) {<font color=#009900>/* self-assignment */</font>}
   left.i ^= right.i;
   <font color=#0000ff>return</font> left;
}
Integer&amp; <font color=#0000ff>operator</font>&amp;=(Integer&amp; left,
                    <font color=#0000ff>const</font> Integer&amp; right) {
   <font color=#0000ff>if</font>(&amp;left == &amp;right) {<font color=#009900>/* self-assignment */</font>}
   left.i &amp;= right.i;
   <font color=#0000ff>return</font> left;
}
Integer&amp; <font color=#0000ff>operator</font>|=(Integer&amp; left,
                    <font color=#0000ff>const</font> Integer&amp; right) {
   <font color=#0000ff>if</font>(&amp;left == &amp;right) {<font color=#009900>/* self-assignment */</font>}
   left.i |= right.i;
   <font color=#0000ff>return</font> left;
}
Integer&amp; <font color=#0000ff>operator</font>&gt;&gt;=(Integer&amp; left,
                     <font color=#0000ff>const</font> Integer&amp; right) {
   <font color=#0000ff>if</font>(&amp;left == &amp;right) {<font color=#009900>/* self-assignment */</font>}
   left.i &gt;&gt;= right.i;
   <font color=#0000ff>return</font> left;
}
Integer&amp; <font color=#0000ff>operator</font>&lt;&lt;=(Integer&amp; left,
                     <font color=#0000ff>const</font> Integer&amp; right) {
   <font color=#0000ff>if</font>(&amp;left == &amp;right) {<font color=#009900>/* self-assignment */</font>}
   left.i &lt;&lt;= right.i;
   <font color=#0000ff>return</font> left;
}
<font color=#009900>// Conditional operators return true/false:</font>
<font color=#0000ff>int</font> <font color=#0000ff>operator</font>==(<font color=#0000ff>const</font> Integer&amp; left,
               <font color=#0000ff>const</font> Integer&amp; right) {
    <font color=#0000ff>return</font> left.i == right.i;
}
<font color=#0000ff>int</font> <font color=#0000ff>operator</font>!=(<font color=#0000ff>const</font> Integer&amp; left,
               <font color=#0000ff>const</font> Integer&amp; right) {
    <font color=#0000ff>return</font> left.i != right.i;
}
<font color=#0000ff>int</font> <font color=#0000ff>operator</font>&lt;(<font color=#0000ff>const</font> Integer&amp; left,
              <font color=#0000ff>const</font> Integer&amp; right) {
    <font color=#0000ff>return</font> left.i &lt; right.i;
}
<font color=#0000ff>int</font> <font color=#0000ff>operator</font>&gt;(<font color=#0000ff>const</font> Integer&amp; left,
              <font color=#0000ff>const</font> Integer&amp; right) {
    <font color=#0000ff>return</font> left.i &gt; right.i;
}
<font color=#0000ff>int</font> <font color=#0000ff>operator</font>&lt;=(<font color=#0000ff>const</font> Integer&amp; left,
               <font color=#0000ff>const</font> Integer&amp; right) {
    <font color=#0000ff>return</font> left.i &lt;= right.i;
}
<font color=#0000ff>int</font> <font color=#0000ff>operator</font>&gt;=(<font color=#0000ff>const</font> Integer&amp; left,
               <font color=#0000ff>const</font> Integer&amp; right) {
    <font color=#0000ff>return</font> left.i &gt;= right.i;
}
<font color=#0000ff>int</font> <font color=#0000ff>operator</font>&amp;&amp;(<font color=#0000ff>const</font> Integer&amp; left,
               <font color=#0000ff>const</font> Integer&amp; right) {
    <font color=#0000ff>return</font> left.i &amp;&amp; right.i;
}
<font color=#0000ff>int</font> <font color=#0000ff>operator</font>||(<font color=#0000ff>const</font> Integer&amp; left,
               <font color=#0000ff>const</font> Integer&amp; right) {
    <font color=#0000ff>return</font> left.i || right.i;
} <font color=#009900>///:~</font></PRE></FONT></BLOCKQUOTE>
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