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来自「《Big C++ 》Third Edition电子书和代码全集-Part1」· HTML 代码 · 共 61 行

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<h2><font color="#009999">26.7 Case Study:  Putting Patterns to Work (cont.)
	</font></h2>
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<ul>
	<li>Make the strategy object available to <tt>Invoice::print</tt>:
		<blockquote>
<pre>
void Invoice::print(InvoiceFormatter&amp; formatter)
{
   print_header("I N V O I C E");
   print_string("Description", true);
   print_string("Unit Price", false);
   print_string("Qty", false);
   print_string("Total Price", false);

   double amount_due = 0;
   for (ItemIterator iter = inv.create_iterator();
      !iter.is_done(); iter.next())
   {
      Item* it = iter.get();
      print_string(it-&gt;get_description(), true);
      print_number(it-&gt;get_unit_price(), 2);
      print_number(it-&gt;get_quantity(), 0);
      print_number(it-&gt;get_total_price(), 2);
      amount_due = amount_due + it-&gt;get_total_price();
   }

   print_footer("AMOUNT DUE:", amount_due);
}</pre>
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	</li>
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