ceph/src/boost/libs/phoenix/doc/html/phoenix/lazy_list/tutorial_with_examples/arithmetic_functions.html

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  26 <div class="titlepage"><div><div><h4 class="title">
  27 <a name="phoenix.lazy_list.tutorial_with_examples.arithmetic_functions"></a><a class="link" href="arithmetic_functions.html" title="Arithmetic functions">Arithmetic
  28         functions</a>
  29 </h4></div></div></div>
  30 <p>
  31           Assume the values
  32         </p>
  33 <pre class="programlisting"><span class="keyword">int</span> <span class="identifier">a</span> <span class="special">=</span> <span class="number">123</span><span class="special">;</span>
  34 <span class="keyword">int</span> <span class="identifier">b</span> <span class="special">=</span> <span class="number">256</span><span class="special">;</span>
  35 </pre>
  36 <p>
  37           The following are all valid expressions returning a+b
  38         </p>
  39 <pre class="programlisting"><span class="identifier">plus</span><span class="special">(</span><span class="identifier">arg1</span><span class="special">,</span> <span class="identifier">arg2</span><span class="special">)(</span><span class="identifier">a</span><span class="special">,</span> <span class="identifier">b</span><span class="special">)</span>
  40 <span class="identifier">plus</span><span class="special">(</span><span class="identifier">arg1</span><span class="special">,</span> <span class="identifier">b</span><span class="special">)(</span><span class="identifier">a</span><span class="special">)</span>
  41 <span class="identifier">plus</span><span class="special">(</span><span class="identifier">a</span><span class="special">,</span> <span class="identifier">arg2</span><span class="special">)(</span><span class="identifier">a</span><span class="special">,</span><span class="identifier">b</span><span class="special">)</span>
  42 <span class="identifier">plus</span><span class="special">(</span><span class="identifier">a</span><span class="special">,</span> <span class="identifier">arg1</span><span class="special">)(</span><span class="identifier">b</span><span class="special">)</span>
  43 <span class="identifier">plus</span><span class="special">(</span><span class="identifier">a</span><span class="special">,</span> <span class="identifier">b</span><span class="special">)()</span>
  44 </pre>
  45 <p>
  46           The expressions can be combined like this
  47         </p>
  48 <pre class="programlisting"><span class="identifier">plus</span><span class="special">(</span><span class="identifier">minus</span><span class="special">(</span><span class="identifier">a</span><span class="special">,</span> <span class="identifier">b</span><span class="special">),</span><span class="identifier">b</span><span class="special">)()</span>
  49 <span class="identifier">plus</span><span class="special">(</span><span class="identifier">minus</span><span class="special">(</span><span class="identifier">arg1</span><span class="special">,</span> <span class="identifier">b</span><span class="special">),</span><span class="identifier">b</span><span class="special">)(</span><span class="identifier">a</span><span class="special">)</span>
  50 <span class="identifier">plus</span><span class="special">(</span><span class="identifier">minus</span><span class="special">(</span><span class="identifier">arg1</span><span class="special">,</span> <span class="identifier">arg2</span><span class="special">),</span><span class="identifier">b</span><span class="special">)(</span><span class="identifier">a</span><span class="special">,</span><span class="identifier">b</span><span class="special">)</span>
  51 <span class="identifier">plus</span><span class="special">(</span><span class="identifier">minus</span><span class="special">(</span><span class="identifier">arg1</span><span class="special">,</span> <span class="identifier">arg2</span><span class="special">),</span><span class="identifier">arg2</span><span class="special">)(</span><span class="identifier">a</span><span class="special">,</span><span class="identifier">b</span><span class="special">)</span>
  52 </pre>
  53 <p>
  54           Other numerical operators can be used like this
  55         </p>
  56 <pre class="programlisting"><span class="identifier">multiplies</span><span class="special">(</span><span class="identifier">arg1</span><span class="special">,</span><span class="identifier">arg2</span><span class="special">)(</span><span class="number">3</span><span class="special">,</span><span class="number">6</span><span class="special">)</span>
  57 <span class="identifier">divides</span><span class="special">(</span><span class="identifier">arg2</span><span class="special">,</span><span class="identifier">arg1</span><span class="special">)(</span><span class="number">3</span><span class="special">,</span><span class="number">6</span><span class="special">)</span>
  58 <span class="identifier">modulus</span><span class="special">(</span><span class="identifier">arg2</span><span class="special">,</span><span class="identifier">arg1</span><span class="special">)(</span><span class="number">4</span><span class="special">,</span><span class="number">6</span><span class="special">)</span>
  59 <span class="identifier">min</span><span class="special">(</span><span class="identifier">arg1</span><span class="special">,</span><span class="identifier">arg2</span><span class="special">)(</span><span class="number">4</span><span class="special">,</span><span class="number">6</span><span class="special">)</span>
  60 <span class="identifier">max</span><span class="special">(</span><span class="identifier">arg1</span><span class="special">,</span><span class="identifier">arg2</span><span class="special">)(</span><span class="number">4</span><span class="special">,</span><span class="number">6</span><span class="special">)</span>
  61 <span class="identifier">inc</span><span class="special">(</span><span class="identifier">arg1</span><span class="special">)(</span><span class="identifier">a</span><span class="special">)</span>
  62 <span class="identifier">dec</span><span class="special">(</span><span class="identifier">arg1</span><span class="special">)(</span><span class="identifier">a</span><span class="special">)</span>
  63 <span class="identifier">negate</span><span class="special">(</span><span class="identifier">arg1</span><span class="special">)(</span><span class="identifier">a</span><span class="special">)</span>
  64 </pre>
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  68 <td align="right"><div class="copyright-footer">Copyright &#169; 2002-2005, 2010, 2014, 2015 Joel de Guzman, Dan Marsden, Thomas
  69       Heller, John Fletcher<p>
  70         Distributed under the Boost Software License, Version 1.0. (See accompanying
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