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<div class="title">fallback_allocator< Default, Fallback > Class Template Reference<div class="ingroups"><a class="el" href="group__adapter.html">Adapters and Wrappers</a></div></div> </div>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><h3>template<class Default, class Fallback><br />
class foonathan::memory::fallback_allocator< Default, Fallback ></h3>
<p>A <a href="md_doc_concepts.html#raw_allocator">RawAllocator</a> with a fallback. </p>
<p>Allocation first tries <code>Default</code>, if it fails, it uses <code>Fallback</code>. </p><dl class="section user"><dt>Requires:</dt><dd><code>Default</code> must be a composable <a href="md_doc_concepts.html#concept_rawallocator">RawAllocator</a>, <code>Fallback</code> must be a <a href="md_doc_concepts.html#concept_rawallocator">RawAllocator</a>. </dd></dl>
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Typedefs</h2></td></tr>
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using </td><td class="memItemRight" valign="bottom"><b>default_allocator_type</b> = typename <a class="el" href="classfoonathan_1_1memory_1_1allocator__traits.html">allocator_traits</a>< Default >::allocator_type</td></tr>
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using </td><td class="memItemRight" valign="bottom"><b>fallback_allocator_type</b> = typename <a class="el" href="classfoonathan_1_1memory_1_1allocator__traits.html">allocator_traits</a>< Fallback >::allocator_type</td></tr>
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using </td><td class="memItemRight" valign="bottom"><b>is_stateful</b> = std::integral_constant< bool, default_traits::is_stateful::value||fallback_traits::is_stateful::value ></td></tr>
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Member Functions</h2></td></tr>
<tr class="memitem:a88528086e5a835fc042f64ad292c69d5"><td class="memTemplParams" colspan="2">template<typename Dummy = std::true_type, FOONATHAN_REQUIRES(Dummy::value &&(!is_stateful::value)) > </td></tr>
<tr class="memitem:a88528086e5a835fc042f64ad292c69d5"><td class="memTemplItemLeft" align="right" valign="top"> </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="classfoonathan_1_1memory_1_1fallback__allocator.html#a88528086e5a835fc042f64ad292c69d5">fallback_allocator</a> ()</td></tr>
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<tr class="memitem:a6bb388024bdf79597713857a8fce014c"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classfoonathan_1_1memory_1_1fallback__allocator.html#a6bb388024bdf79597713857a8fce014c">fallback_allocator</a> (default_allocator_type &&default_alloc, fallback_allocator_type &&fallback_alloc={})</td></tr>
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<tr class="memitem:aa0774f4f3278b78aab48272657c8da07"><td class="memItemLeft" align="right" valign="top">void * </td><td class="memItemRight" valign="bottom"><a class="el" href="classfoonathan_1_1memory_1_1fallback__allocator.html#aa0774f4f3278b78aab48272657c8da07">allocate_node</a> (std::size_t size, std::size_t alignment)</td></tr>
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<tr class="memitem:a715b1b18b6b22f38918a3b9c9a9fae0b"><td class="memItemLeft" align="right" valign="top">void * </td><td class="memItemRight" valign="bottom"><a class="el" href="classfoonathan_1_1memory_1_1fallback__allocator.html#a715b1b18b6b22f38918a3b9c9a9fae0b">allocate_array</a> (std::size_t count, std::size_t size, std::size_t alignment)</td></tr>
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<tr class="memitem:af39c4c8201ed3a86738d5571239e19db"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classfoonathan_1_1memory_1_1fallback__allocator.html#af39c4c8201ed3a86738d5571239e19db">deallocate_node</a> (void *ptr, std::size_t size, std::size_t alignment) noexcept</td></tr>
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<tr class="memitem:a7f89da0a2dbd6ad5089178c828bb95df"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classfoonathan_1_1memory_1_1fallback__allocator.html#a7f89da0a2dbd6ad5089178c828bb95df">deallocate_array</a> (void *ptr, std::size_t count, std::size_t size, std::size_t alignment) noexcept</td></tr>
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<tr class="memitem:a592316c791828db1554c8152dbb512e0"><td class="memTemplParams" colspan="2">template<typename Dummy = std::true_type, FOONATHAN_REQUIRES(Dummy::value &&(fallback_composable::value)) > </td></tr>
<tr class="memitem:a592316c791828db1554c8152dbb512e0"><td class="memTemplItemLeft" align="right" valign="top">void * </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="classfoonathan_1_1memory_1_1fallback__allocator.html#a592316c791828db1554c8152dbb512e0">try_allocate_node</a> (std::size_t size, std::size_t alignment) noexcept</td></tr>
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<tr class="memitem:a5b5eef0eba765360e15659b3e44efb32"><td class="memTemplParams" colspan="2">template<typename Dummy = std::true_type, FOONATHAN_REQUIRES(Dummy::value &&(fallback_composable::value)) > </td></tr>
<tr class="memitem:a5b5eef0eba765360e15659b3e44efb32"><td class="memTemplItemLeft" align="right" valign="top">void * </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="classfoonathan_1_1memory_1_1fallback__allocator.html#a5b5eef0eba765360e15659b3e44efb32">allocate_array</a> (std::size_t count, std::size_t size, std::size_t alignment) noexcept</td></tr>
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<tr class="memitem:ae6c9e0f5870c99a1accc9f3584b5204e"><td class="memTemplParams" colspan="2">template<typename Dummy = std::true_type, FOONATHAN_REQUIRES(Dummy::value &&(fallback_composable::value)) > </td></tr>
<tr class="memitem:ae6c9e0f5870c99a1accc9f3584b5204e"><td class="memTemplItemLeft" align="right" valign="top">bool </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="classfoonathan_1_1memory_1_1fallback__allocator.html#ae6c9e0f5870c99a1accc9f3584b5204e">try_deallocate_node</a> (void *ptr, std::size_t size, std::size_t alignment) noexcept</td></tr>
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<tr class="memitem:a351b4f545a9cd775cee55a641ed41487"><td class="memTemplParams" colspan="2">template<typename Dummy = std::true_type, FOONATHAN_REQUIRES(Dummy::value &&(fallback_composable::value)) > </td></tr>
<tr class="memitem:a351b4f545a9cd775cee55a641ed41487"><td class="memTemplItemLeft" align="right" valign="top">bool </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="classfoonathan_1_1memory_1_1fallback__allocator.html#a351b4f545a9cd775cee55a641ed41487">try_deallocate_array</a> (void *ptr, std::size_t count, std::size_t size, std::size_t alignment) noexcept</td></tr>
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<tr class="memitem:a64caa0912affaefd4778635a8a76294c"><td class="memItemLeft" align="right" valign="top">std::size_t </td><td class="memItemRight" valign="bottom"><a class="el" href="classfoonathan_1_1memory_1_1fallback__allocator.html#a64caa0912affaefd4778635a8a76294c">max_node_size</a> () const</td></tr>
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<tr class="memitem:a62f877acb00d33a3725a41c767152a5c"><td class="memItemLeft" align="right" valign="top">std::size_t </td><td class="memItemRight" valign="bottom"><a class="el" href="classfoonathan_1_1memory_1_1fallback__allocator.html#a62f877acb00d33a3725a41c767152a5c">max_array_size</a> () const</td></tr>
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<tr class="memitem:a43e724b99fe1eb9b9a986a993da27b3b"><td class="memItemLeft" align="right" valign="top">std::size_t </td><td class="memItemRight" valign="bottom"><a class="el" href="classfoonathan_1_1memory_1_1fallback__allocator.html#a43e724b99fe1eb9b9a986a993da27b3b">max_alignment</a> () const</td></tr>
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<tr class="memitem:aa1afa202c5946ddb874414b91c221d84"><td class="memItemLeft" align="right" valign="top">default_allocator_type & </td><td class="memItemRight" valign="bottom"><a class="el" href="classfoonathan_1_1memory_1_1fallback__allocator.html#aa1afa202c5946ddb874414b91c221d84">get_default_allocator</a> () noexcept</td></tr>
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<tr class="memitem:a810c0107d673dabbff8215aee03c624e"><td class="memItemLeft" align="right" valign="top">const default_allocator_type & </td><td class="memItemRight" valign="bottom"><a class="el" href="classfoonathan_1_1memory_1_1fallback__allocator.html#a810c0107d673dabbff8215aee03c624e">get_default_allocator</a> () const noexcept</td></tr>
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<tr class="memitem:a534db886b34ee9d86b6b9c0c2a520e49"><td class="memItemLeft" align="right" valign="top">fallback_allocator_type & </td><td class="memItemRight" valign="bottom"><a class="el" href="classfoonathan_1_1memory_1_1fallback__allocator.html#a534db886b34ee9d86b6b9c0c2a520e49">get_fallback_allocator</a> () noexcept</td></tr>
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<tr class="memitem:abe5d80d5656165acb6f2eec7cbbbd24b"><td class="memItemLeft" align="right" valign="top">const fallback_allocator_type & </td><td class="memItemRight" valign="bottom"><a class="el" href="classfoonathan_1_1memory_1_1fallback__allocator.html#abe5d80d5656165acb6f2eec7cbbbd24b">get_fallback_allocator</a> () const noexcept</td></tr>
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<h2 class="groupheader">Constructors</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#a88528086e5a835fc042f64ad292c69d5">◆ </a></span>fallback_allocator() <span class="overload">[1/2]</span></h2>
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<td class="memname"><a class="el" href="classfoonathan_1_1memory_1_1fallback__allocator.html">fallback_allocator</a> </td>
<td>(</td>
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<dl class="section user"><dt>Effects:</dt><dd>Default constructs both allocators. </dd></dl>
<dl class="section user"><dt>Notes:</dt><dd>This function only participates in overload resolution, if both allocators are not stateful. </dd></dl>
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<td>(</td>
<td class="paramtype">default_allocator_type && </td>
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<td class="paramtype">fallback_allocator_type && </td>
<td class="paramname"><em>fallback_alloc</em> = <code>{}</code> </td>
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<dl class="section user"><dt>Effects:</dt><dd>Constructs the allocator by passing in the two allocators it has. </dd></dl>
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<h2 class="groupheader">Member Functions</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#aa0774f4f3278b78aab48272657c8da07">◆ </a></span>allocate_node()</h2>
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<td class="memname">void* allocate_node </td>
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<dl class="section user"><dt>Effects:</dt><dd>First calls the compositioning (de)allocation function on the <code>default_allocator_type</code>. If that fails, uses the non-compositioning function of the <code>fallback_allocator_type</code>. </dd></dl>
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<dl class="section user"><dt>Effects:</dt><dd>First calls the compositioning (de)allocation function on the <code>default_allocator_type</code>. If that fails, uses the non-compositioning function of the <code>fallback_allocator_type</code>. </dd></dl>
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<td class="memname">void deallocate_node </td>
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<dl class="section user"><dt>Effects:</dt><dd>First calls the compositioning (de)allocation function on the <code>default_allocator_type</code>. If that fails, uses the non-compositioning function of the <code>fallback_allocator_type</code>. </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#a7f89da0a2dbd6ad5089178c828bb95df">◆ </a></span>deallocate_array()</h2>
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<td class="memname">void deallocate_array </td>
<td>(</td>
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<td class="paramtype">std::size_t </td>
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<dl class="section user"><dt>Effects:</dt><dd>First calls the compositioning (de)allocation function on the <code>default_allocator_type</code>. If that fails, uses the non-compositioning function of the <code>fallback_allocator_type</code>. </dd></dl>
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<a id="a592316c791828db1554c8152dbb512e0"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a592316c791828db1554c8152dbb512e0">◆ </a></span>try_allocate_node()</h2>
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<td class="memname">void* try_allocate_node </td>
<td>(</td>
<td class="paramtype">std::size_t </td>
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<td class="paramkey"></td>
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<td class="paramtype">std::size_t </td>
<td class="paramname"><em>alignment</em> </td>
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<dl class="section user"><dt>Effects:</dt><dd>First calls the compositioning (de)allocation function on the <code>default_allocator_type</code>. If that fails, uses the compositioning function of the <code>fallback_allocator_type</code>. </dd></dl>
<dl class="section user"><dt>Requires:</dt><dd>The <code>fallback_allocator_type</code> msut be composable. </dd></dl>
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<a id="a5b5eef0eba765360e15659b3e44efb32"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a5b5eef0eba765360e15659b3e44efb32">◆ </a></span>allocate_array() <span class="overload">[2/2]</span></h2>
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<td class="memname">void* allocate_array </td>
<td>(</td>
<td class="paramtype">std::size_t </td>
<td class="paramname"><em>count</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">std::size_t </td>
<td class="paramname"><em>size</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">std::size_t </td>
<td class="paramname"><em>alignment</em> </td>
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<td>)</td>
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<dl class="section user"><dt>Effects:</dt><dd>First calls the compositioning (de)allocation function on the <code>default_allocator_type</code>. If that fails, uses the compositioning function of the <code>fallback_allocator_type</code>. </dd></dl>
<dl class="section user"><dt>Requires:</dt><dd>The <code>fallback_allocator_type</code> msut be composable. </dd></dl>
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<a id="ae6c9e0f5870c99a1accc9f3584b5204e"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ae6c9e0f5870c99a1accc9f3584b5204e">◆ </a></span>try_deallocate_node()</h2>
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<td class="memname">bool try_deallocate_node </td>
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<td class="paramtype">void * </td>
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<td class="paramkey"></td>
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<td class="paramtype">std::size_t </td>
<td class="paramname"><em>size</em>, </td>
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<td class="paramkey"></td>
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<td class="paramtype">std::size_t </td>
<td class="paramname"><em>alignment</em> </td>
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<span class="mlabels"><span class="mlabel">noexcept</span></span> </td>
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<dl class="section user"><dt>Effects:</dt><dd>First calls the compositioning (de)allocation function on the <code>default_allocator_type</code>. If that fails, uses the compositioning function of the <code>fallback_allocator_type</code>. </dd></dl>
<dl class="section user"><dt>Requires:</dt><dd>The <code>fallback_allocator_type</code> msut be composable. </dd></dl>
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<a id="a351b4f545a9cd775cee55a641ed41487"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a351b4f545a9cd775cee55a641ed41487">◆ </a></span>try_deallocate_array()</h2>
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<td class="memname">bool try_deallocate_array </td>
<td>(</td>
<td class="paramtype">void * </td>
<td class="paramname"><em>ptr</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">std::size_t </td>
<td class="paramname"><em>count</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">std::size_t </td>
<td class="paramname"><em>size</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">std::size_t </td>
<td class="paramname"><em>alignment</em> </td>
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<dl class="section user"><dt>Effects:</dt><dd>First calls the compositioning (de)allocation function on the <code>default_allocator_type</code>. If that fails, uses the compositioning function of the <code>fallback_allocator_type</code>. </dd></dl>
<dl class="section user"><dt>Requires:</dt><dd>The <code>fallback_allocator_type</code> msut be composable. </dd></dl>
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<a id="a64caa0912affaefd4778635a8a76294c"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a64caa0912affaefd4778635a8a76294c">◆ </a></span>max_node_size()</h2>
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<td class="memname">std::size_t max_node_size </td>
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<td> const</td>
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<dl class="section user"><dt>Returns:</dt><dd>The maximum of the two values from both allocators. </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#a62f877acb00d33a3725a41c767152a5c">◆ </a></span>max_array_size()</h2>
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<td class="memname">std::size_t max_array_size </td>
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<dl class="section user"><dt>Returns:</dt><dd>The maximum of the two values from both allocators. </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#a43e724b99fe1eb9b9a986a993da27b3b">◆ </a></span>max_alignment()</h2>
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<td class="memname">std::size_t max_alignment </td>
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<dl class="section user"><dt>Returns:</dt><dd>The maximum of the two values from both allocators. </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#aa1afa202c5946ddb874414b91c221d84">◆ </a></span>get_default_allocator() <span class="overload">[1/2]</span></h2>
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<td class="memname">default_allocator_type& get_default_allocator </td>
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<dl class="section user"><dt>Returns:</dt><dd>A (<code>const</code>) reference to the default allocator. </dd></dl>
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<a id="a810c0107d673dabbff8215aee03c624e"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a810c0107d673dabbff8215aee03c624e">◆ </a></span>get_default_allocator() <span class="overload">[2/2]</span></h2>
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<td class="memname">const default_allocator_type& get_default_allocator </td>
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<td> const</td>
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<dl class="section user"><dt>Returns:</dt><dd>A (<code>const</code>) reference to the default allocator. </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#a534db886b34ee9d86b6b9c0c2a520e49">◆ </a></span>get_fallback_allocator() <span class="overload">[1/2]</span></h2>
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<td class="memname">fallback_allocator_type& get_fallback_allocator </td>
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<dl class="section user"><dt>Returns:</dt><dd>A (<code>const</code>) reference to the fallback allocator. </dd></dl>
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<a id="abe5d80d5656165acb6f2eec7cbbbd24b"></a>
<h2 class="memtitle"><span class="permalink"><a href="#abe5d80d5656165acb6f2eec7cbbbd24b">◆ </a></span>get_fallback_allocator() <span class="overload">[2/2]</span></h2>
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<td class="memname">const fallback_allocator_type& get_fallback_allocator </td>
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<dl class="section user"><dt>Returns:</dt><dd>A (<code>const</code>) reference to the fallback allocator. </dd></dl>
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