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  26 <div class="titlepage"><div><div><h4 class="title">
  27 <a name="boost_test.adv_scenarios.single_header_customizations.multiple_translation_units"></a><a class="link" href="multiple_translation_units.html" title="Header-only with multiple translation units">Header-only
  28         with multiple translation units</a>
  29 </h4></div></div></div>
  30 <p>
  31           It is possible to use the header-only variant of the <span class="emphasis"><em>Unit Test
  32           Framework</em></span> even if the test module has multiple translation units:
  33         </p>
  34 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
  35 <li class="listitem">
  36               one translation unit should define <a class="link" href="../../utf_reference/link_references/link_boost_test_module_macro.html" title="BOOST_TEST_MODULE"><code class="computeroutput"><span class="identifier">BOOST_TEST_MODULE</span></code></a> and include
  37               <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">test</span><span class="special">/</span><span class="identifier">included</span><span class="special">/</span><span class="identifier">unit_test</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code>
  38             </li>
  39 <li class="listitem">
  40               all the other translation units should include <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">test</span><span class="special">/</span><span class="identifier">unit_test</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code>
  41             </li>
  42 </ul></div>
  43 <p>
  44           An example might be the following:
  45         </p>
  46 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
  47 <li class="listitem">
  48 <p class="simpara">
  49               Translation unit 1, defines <a class="link" href="../../utf_reference/link_references/link_boost_test_module_macro.html" title="BOOST_TEST_MODULE"><code class="computeroutput"><span class="identifier">BOOST_TEST_MODULE</span></code></a>
  50             </p>
  51 <pre class="programlisting"><span class="preprocessor">#define</span> <span class="identifier">BOOST_TEST_MODULE</span> <span class="identifier">header</span><span class="special">-</span><span class="identifier">only</span> <span class="identifier">multiunit</span> <span class="identifier">test</span>
  52 <span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">test</span><span class="special">/</span><span class="identifier">included</span><span class="special">/</span><span class="identifier">unit_test</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
  53
  54 <span class="identifier">BOOST_AUTO_TEST_CASE</span><span class="special">(</span> <span class="identifier">test1</span> <span class="special">)</span>
  55 <span class="special">{</span>
  56     <span class="keyword">int</span> <span class="identifier">i</span> <span class="special">=</span> <span class="number">1</span><span class="special">;</span>
  57     <span class="identifier">BOOST_CHECK</span><span class="special">(</span> <span class="identifier">i</span><span class="special">*</span><span class="identifier">i</span> <span class="special">==</span> <span class="number">1</span> <span class="special">);</span>
  58 <span class="special">}</span>
  59 </pre>
  60 </li>
  61 <li class="listitem">
  62 <p class="simpara">
  63               Translation unit 2, includes <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">test</span><span class="special">/</span><span class="identifier">unit_test</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code>
  64               instead of <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">test</span><span class="special">/</span><span class="identifier">included</span><span class="special">/</span><span class="identifier">unit_test</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code>:
  65             </p>
  66 <pre class="programlisting"><span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">test</span><span class="special">/</span><span class="identifier">unit_test</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
  67
  68 <span class="identifier">BOOST_AUTO_TEST_CASE</span><span class="special">(</span> <span class="identifier">test2</span> <span class="special">)</span>
  69 <span class="special">{</span>
  70     <span class="keyword">int</span> <span class="identifier">i</span> <span class="special">=</span> <span class="number">1</span><span class="special">;</span>
  71     <span class="identifier">BOOST_CHECK</span><span class="special">(</span> <span class="identifier">i</span><span class="special">*</span><span class="identifier">i</span> <span class="special">==</span> <span class="number">1</span> <span class="special">);</span>
  72 <span class="special">}</span>
  73 </pre>
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