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<div class="titlepage"><div><div><h4 class="title">
<a name="boost_test.utf_reference.rt_param_reference.save_pattern"></a><a class="link" href="save_pattern.html" title="save_pattern"><code class="computeroutput"><span class="identifier">save_pattern</span></code></a>
</h4></div></div></div>
<p>
          Option <span class="emphasis"><em>save_pattern</em></span> facilitates switching mode of
          operation for testing output streams. See <a class="link" href="../../testing_tools/output_stream_testing.html" title="Output streams testing tool">output
          test stream</a> section for details on these tests.
        </p>
<p>
          This parameter serves no particular purpose within the framework itself.
          It can be used by test modules relying on <code class="computeroutput"><a class="link" href="../../../boost/test_tools/output_test_stream.html" title="Class output_test_stream">boost::test_tools::output_test_stream</a></code>
          to implement testing logic. It has two modes of operation:
        </p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
              save the pattern file (true).
            </li>
<li class="listitem">
              and match against a previously stored pattern file (false).
            </li>
</ul></div>
<p>
          Default mode is 'match' (false).
        </p>
<p>
          You can use this parameter to switch between these modes, by passing the
          parameter value to the <code class="computeroutput"><span class="identifier">output_test_stream</span></code>
          constructor. The value of the command line parameter is available using
          call like this:
        </p>
<pre class="programlisting"><span class="keyword">bool</span> <span class="identifier">is_save_pattern_flag_set</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">unit_test</span><span class="special">::</span><span class="identifier">runtime_config</span><span class="special">::</span><span class="identifier">save_pattern</span><span class="special">();</span>
</pre>
<h5>
<a name="boost_test.utf_reference.rt_param_reference.save_pattern.h0"></a>
          <span class="phrase"><a name="boost_test.utf_reference.rt_param_reference.save_pattern.acceptable_values"></a></span><a class="link" href="save_pattern.html#boost_test.utf_reference.rt_param_reference.save_pattern.acceptable_values">Acceptable
          values</a>
        </h5>
<p>
          <a class="link" href="../rt_param_reference.html#boolean_param_value">Boolean</a> with default value
          <span class="bold"><strong>no</strong></span>.
        </p>
<h5>
<a name="boost_test.utf_reference.rt_param_reference.save_pattern.h1"></a>
          <span class="phrase"><a name="boost_test.utf_reference.rt_param_reference.save_pattern.command_line_syntax"></a></span><a class="link" href="save_pattern.html#boost_test.utf_reference.rt_param_reference.save_pattern.command_line_syntax">Command
          line syntax</a>
        </h5>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">
              <code class="computeroutput"><span class="special">--</span><span class="identifier">save_pattern</span><span class="special">[=&lt;</span><span class="identifier">boolean</span>
              <span class="identifier">value</span><span class="special">&gt;]</span></code>
            </li></ul></div>
<h5>
<a name="boost_test.utf_reference.rt_param_reference.save_pattern.h2"></a>
          <span class="phrase"><a name="boost_test.utf_reference.rt_param_reference.save_pattern.environment_variable"></a></span><a class="link" href="save_pattern.html#boost_test.utf_reference.rt_param_reference.save_pattern.environment_variable">Environment
          variable</a>
        </h5>
<pre class="programlisting"><span class="identifier">BOOST_TEST_SAVE_PATTERN</span>
</pre>
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