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<div class="title">rttr_cast vs. dynamic_cast </div> </div>
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<div class="textblock"><p>The <a class="el" href="namespacerttr.html#ab3dd8b62e5ddca4c1d57cc572ba6bb81">rttr_cast</a> function behaves similarly to the standard C++ <code>dynamic_cast</code>. However, it has some advantages, it doesn't require RTTI support, it works across dynamic library boundaries and it performs faster. Run the <code>benchmark</code> target to perform this test on your local machine.</p>
<h2><a class="el" href="namespacerttr.html#ab3dd8b62e5ddca4c1d57cc572ba6bb81" title="Casts the given object of type Source_Type to an object of type Target_Type.">rttr::rttr_cast<T>()</a> </h2>
<p>The function <a class="el" href="namespacerttr.html#ab3dd8b62e5ddca4c1d57cc572ba6bb81">rttr_cast</a> allows the client to cast between class hierarchies up and down, cross casts between unrelated classes and even class hierarchies with virtual inheritance. The target type <code>T</code> can be also in the middle of the hierarchy.</p>
<div class="fragment"><div class="line"><span class="keyword">struct </span>A { <a class="code" href="rttr__enable_8h.html#a848bcae21d3a54e07ca6450689820a59">RTTR_ENABLE</a>() };</div><div class="line"><span class="keyword">struct </span>B : A { <a class="code" href="rttr__enable_8h.html#a848bcae21d3a54e07ca6450689820a59">RTTR_ENABLE</a>(A) };</div><div class="line"><span class="keyword">struct </span>C : B { <a class="code" href="rttr__enable_8h.html#a848bcae21d3a54e07ca6450689820a59">RTTR_ENABLE</a>(B) };</div><div class="line">C c;</div><div class="line">A* a = &c;</div><div class="line">B* b = rttr_cast<B*>(a); <span class="comment">// successful</span></div></div><!-- fragment --><p>Cross casts are also possible:</p>
<div class="fragment"><div class="line"><span class="keyword">struct </span>A { <a class="code" href="rttr__enable_8h.html#a848bcae21d3a54e07ca6450689820a59">RTTR_ENABLE</a>() };</div><div class="line"><span class="keyword">struct </span>B { <a class="code" href="rttr__enable_8h.html#a848bcae21d3a54e07ca6450689820a59">RTTR_ENABLE</a>() };</div><div class="line"><span class="keyword">struct </span>C : A , B { <a class="code" href="rttr__enable_8h.html#a848bcae21d3a54e07ca6450689820a59">RTTR_ENABLE</a>(A, B) };</div><div class="line">C c;</div><div class="line">A* a = &c;</div><div class="line">B* b = rttr_cast<B*>(a); <span class="comment">// successful; remark that class A and B are unrelated from each other</span></div></div><!-- fragment --><p>A <a class="el" href="classrttr_1_1type.html">type</a> object knows from which parent class it is derived. Assumed this information is given via <a class="el" href="rttr__enable_8h.html#a848bcae21d3a54e07ca6450689820a59">RTTR_ENABLE</a>.</p>
<dl class="section remark"><dt>Remarks</dt><dd>Because exception are not supported the target type <code>T</code> can only be a pointer type.</dd></dl>
<h2>Summary </h2>
<ul>
<li>when it's necessary to perform down casts or cross casts with a given instance, then use <code>rttr_cast</code></li>
</ul>
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