slide076.html
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.)
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<ul>
<li>Make the strategy object available to <tt>Invoice::print</tt>:
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<pre>
void Invoice::print(InvoiceFormatter& 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->get_description(), true);
print_number(it->get_unit_price(), 2);
print_number(it->get_quantity(), 0);
print_number(it->get_total_price(), 2);
amount_due = amount_due + it->get_total_price();
}
print_footer("AMOUNT DUE:", amount_due);
}</pre>
</blockquote>
</li>
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