<html> <head> <!-- Generated by the Spirit (http://spirit.sf.net) QuickDoc --> <title>Efficiency</title> <link rel="stylesheet" href="theme/style.css" type="text/css"> <link rel="prev" href="lazy_construction.html"> <link rel="next" href="inside_phoenix.html"> </head> <body> <table width="100%" height="48" border="0" background="theme/bkd2.gif" cellspacing="2"> <tr> <td width="10"> </td> <td width="85%"> <font size="6" face="Verdana, Arial, Helvetica, sans-serif"><b>Efficiency</b></font> </td> <td width="112"><a href="http://spirit.sf.net"><img src="theme/spirit.gif" align="right" border="0"></a></td> </tr> </table> <br> <table border="0"> <tr> <td width="30"><a href="../index.html"><img src="theme/u_arr.gif" border="0"></a></td> <td width="30"><a href="lazy_construction.html"><img src="theme/l_arr.gif" border="0"></a></td> <td width="20"><a href="inside_phoenix.html"><img src="theme/r_arr.gif" border="0"></a></td> </tr> </table> <p> Now this is important. Operators that form expressions and statements, while truly expressive, should be used judiciously and sparingly. While aggressive compiler optimizations and inline code helps a lot to produce tighter and faster code, lazy operators and statements will always have more overhead compared to lazy- functions and bound simple functors especially when the logic gets to be quite complex. It is not only run-time code that hits a penalty, complex expressions involving lazy-operators and lazy- functions are also much more difficult to parse and compile by the host C++ compiler and results in much longer compile times.</p> <table width="80%" border="0" align="center"> <tr> <td class="note_box"> <img src="theme/bulb.gif"></img> <b>Lambda vs. Offline Functions</b><br><br>The best way to use the framework is to write generic off-line lazy functions (see functions) then call these functions lazily using straight-forward inline lazy-operators and lazy-statements. </td> </tr> </table> <p> While it is indeed satisfying to impress others with quite esoteric uses of operator overloading and generative programming as can be done by lazy-operators and lazy-statements, these tools are meant to be used for the right job. That said, caveat-emptor.</p> <table width="80%" border="0" align="center"> <tr> <td class="note_box"> <img src="theme/note.gif"></img> need benchmarks, benchmarks, and more benchmarks </td> </tr> </table> <table border="0"> <tr> <td width="30"><a href="../index.html"><img src="theme/u_arr.gif" border="0"></a></td> <td width="30"><a href="lazy_construction.html"><img src="theme/l_arr.gif" border="0"></a></td> <td width="20"><a href="inside_phoenix.html"><img src="theme/r_arr.gif" border="0"></a></td> </tr> </table> <br> <hr size="1"> <p class="copyright">Copyright © 2001-2002 Joel de Guzman<br> <br> <font size="2">Use, modification and distribution is subject to the Boost Software License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) </font> </p> </body> </html>