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<div class="textblock"><code>#include &quot;<a class="el" href="AlignedMemoryResource_8h_source.html">pma/resources/AlignedMemoryResource.h</a>&quot;</code><br />
<code>#include &lt;cassert&gt;</code><br />
<code>#include &lt;cstddef&gt;</code><br />
<code>#include &lt;cstdint&gt;</code><br />
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Macros</h2></td></tr>
<tr class="memitem:acb861b2c4ec0c3344f25e69b667d9810"><td class="memItemLeft" align="right" valign="top">#define&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="AlignedMemoryResource_8cpp.html#acb861b2c4ec0c3344f25e69b667d9810">ALIGNED_ALLOC</a>(ptr, alignment, size)&#160;&#160;&#160;ptr = <a class="el" href="AlignedMemoryResource_8cpp.html#ab8a1c145d376a36ae8ca2e4213b6f852">alignedAlloc</a>(size, alignment)</td></tr>
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Functions</h2></td></tr>
<tr class="memitem:a1e2fd36ca37121582814c06f59e756e6"><td class="memItemLeft" align="right" valign="top">std::uintptr_t&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="AlignedMemoryResource_8cpp.html#a1e2fd36ca37121582814c06f59e756e6">alignAddress</a> (std::uintptr_t address, std::size_t alignment)</td></tr>
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<tr class="memitem:ab078fdf361932eac77e00095a9896676"><td class="memTemplParams" colspan="2">template&lt;typename T &gt; </td></tr>
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<tr class="memitem:ab8a1c145d376a36ae8ca2e4213b6f852"><td class="memItemLeft" align="right" valign="top">void *&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="AlignedMemoryResource_8cpp.html#ab8a1c145d376a36ae8ca2e4213b6f852">alignedAlloc</a> (std::size_t size, std::size_t alignment)</td></tr>
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<h2 class="memtitle"><span class="permalink"><a href="#acb861b2c4ec0c3344f25e69b667d9810">&#9670;&nbsp;</a></span>ALIGNED_ALLOC</h2>
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<td class="memname">#define ALIGNED_ALLOC</td>
<td>(</td>
<td class="paramtype">&#160;</td>
<td class="paramname">ptr, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">&#160;</td>
<td class="paramname">alignment, </td>
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<td></td>
<td class="paramtype">&#160;</td>
<td class="paramname">size&#160;</td>
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<td></td><td>&#160;&#160;&#160;ptr = <a class="el" href="AlignedMemoryResource_8cpp.html#ab8a1c145d376a36ae8ca2e4213b6f852">alignedAlloc</a>(size, alignment)</td>
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<h2 class="memtitle"><span class="permalink"><a href="#a2018dcdf31f7fd4efa685ecff3137b05">&#9670;&nbsp;</a></span>ALIGNED_FREE</h2>
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<td class="memname">#define ALIGNED_FREE</td>
<td>(</td>
<td class="paramtype">&#160;</td>
<td class="paramname">ptr</td><td>)</td>
<td>&#160;&#160;&#160;<a class="el" href="AlignedMemoryResource_8cpp.html#a2898a09481cbfcd24d6d1309021ac137">alignedFree</a>(ptr)</td>
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<h2 class="groupheader">Function Documentation</h2>
<a id="a1e2fd36ca37121582814c06f59e756e6" name="a1e2fd36ca37121582814c06f59e756e6"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a1e2fd36ca37121582814c06f59e756e6">&#9670;&nbsp;</a></span>alignAddress()</h2>
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<td class="memname">std::uintptr_t alignAddress </td>
<td>(</td>
<td class="paramtype">std::uintptr_t&#160;</td>
<td class="paramname"><em>address</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">std::size_t&#160;</td>
<td class="paramname"><em>alignment</em>&#160;</td>
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<div class="fragment"><div class="line"><span class="lineno"> 31</span> {</div>
<div class="line"><span class="lineno"> 32</span> <span class="keyword">const</span> std::size_t mask = alignment - 1ul;</div>
<div class="line"><span class="lineno"> 33</span> assert((alignment &amp; mask) == 0ul);</div>
<div class="line"><span class="lineno"> 34</span> <span class="keywordflow">return</span> (address + mask) &amp; ~mask;</div>
<div class="line"><span class="lineno"> 35</span> }</div>
</div><!-- fragment -->
<p class="reference">Referenced by <a class="el" href="AlignedMemoryResource_8cpp.html#ab078fdf361932eac77e00095a9896676">alignPointer()</a>.</p>
</div>
</div>
<a id="ab8a1c145d376a36ae8ca2e4213b6f852" name="ab8a1c145d376a36ae8ca2e4213b6f852"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ab8a1c145d376a36ae8ca2e4213b6f852">&#9670;&nbsp;</a></span>alignedAlloc()</h2>
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<td class="memname">void * alignedAlloc </td>
<td>(</td>
<td class="paramtype">std::size_t&#160;</td>
<td class="paramname"><em>size</em>, </td>
</tr>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">std::size_t&#160;</td>
<td class="paramname"><em>alignment</em>&#160;</td>
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<td></td>
<td>)</td>
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<div class="fragment"><div class="line"><span class="lineno"> 44</span> {</div>
<div class="line"><span class="lineno"> 45</span> <span class="keyword">const</span> std::size_t actualSize = size + alignment;</div>
<div class="line"><span class="lineno"> 46</span> <span class="keywordtype">char</span>* pUnalignedChunk = <span class="keyword">new</span> <span class="keywordtype">char</span>[actualSize];</div>
<div class="line"><span class="lineno"> 47</span> <span class="keywordtype">char</span>* pAlignedChunk = <a class="code hl_function" href="AlignedMemoryResource_8cpp.html#ab078fdf361932eac77e00095a9896676">alignPointer</a>(pUnalignedChunk, alignment);</div>
<div class="line"><span class="lineno"> 48</span> <span class="keywordflow">if</span> (pAlignedChunk == pUnalignedChunk) {</div>
<div class="line"><span class="lineno"> 49</span> <span class="comment">// There was no need for additional alignment, so an artifical gap</span></div>
<div class="line"><span class="lineno"> 50</span> <span class="comment">// must be added to make room for the shift value</span></div>
<div class="line"><span class="lineno"> 51</span> pAlignedChunk += alignment;</div>
<div class="line"><span class="lineno"> 52</span> }</div>
<div class="line"><span class="lineno"> 53</span> <span class="comment">// Compute and write the shift value into the buffer (it is needed during</span></div>
<div class="line"><span class="lineno"> 54</span> <span class="comment">// deallocation to reconstruct by which amount was the given pointer</span></div>
<div class="line"><span class="lineno"> 55</span> <span class="comment">// offset to meet the alignment requirement)</span></div>
<div class="line"><span class="lineno"> 56</span> std::ptrdiff_t shift = pAlignedChunk - pUnalignedChunk;</div>
<div class="line"><span class="lineno"> 57</span> <span class="comment">// The guaranteed storage size for the shift value is only one byte</span></div>
<div class="line"><span class="lineno"> 58</span> assert(shift &gt; 0 &amp;&amp; shift &lt;= 256);</div>
<div class="line"><span class="lineno"> 59</span> pAlignedChunk[-1] = <span class="keyword">static_cast&lt;</span><span class="keywordtype">char</span><span class="keyword">&gt;</span>(shift &amp; 0xFF);</div>
<div class="line"><span class="lineno"> 60</span> <span class="keywordflow">return</span> <span class="keyword">static_cast&lt;</span><span class="keywordtype">void</span>*<span class="keyword">&gt;</span>(pAlignedChunk);</div>
<div class="line"><span class="lineno"> 61</span> }</div>
<div class="ttc" id="aAlignedMemoryResource_8cpp_html_ab078fdf361932eac77e00095a9896676"><div class="ttname"><a href="AlignedMemoryResource_8cpp.html#ab078fdf361932eac77e00095a9896676">alignPointer</a></div><div class="ttdeci">T * alignPointer(T *ptr, std::size_t alignment)</div><div class="ttdef"><b>Definition:</b> AlignedMemoryResource.cpp:38</div></div>
</div><!-- fragment -->
<p class="reference">References <a class="el" href="AlignedMemoryResource_8cpp.html#ab078fdf361932eac77e00095a9896676">alignPointer()</a>.</p>
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<a id="a2898a09481cbfcd24d6d1309021ac137" name="a2898a09481cbfcd24d6d1309021ac137"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a2898a09481cbfcd24d6d1309021ac137">&#9670;&nbsp;</a></span>alignedFree()</h2>
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<td class="memname">void alignedFree </td>
<td>(</td>
<td class="paramtype">void *&#160;</td>
<td class="paramname"><em>ptr</em></td><td>)</td>
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<div class="fragment"><div class="line"><span class="lineno"> 63</span> {</div>
<div class="line"><span class="lineno"> 64</span> <span class="keywordflow">if</span> (ptr) {</div>
<div class="line"><span class="lineno"> 65</span> <span class="keyword">auto</span> pAlignedChunk = <span class="keyword">reinterpret_cast&lt;</span><span class="keywordtype">char</span>*<span class="keyword">&gt;</span>(ptr);</div>
<div class="line"><span class="lineno"> 66</span> std::ptrdiff_t shift = pAlignedChunk[-1];</div>
<div class="line"><span class="lineno"> 67</span> <span class="comment">// There is no 0 alignment, so the value is reused to actually denote alignment by 256</span></div>
<div class="line"><span class="lineno"> 68</span> <span class="keywordflow">if</span> (shift == 0) {</div>
<div class="line"><span class="lineno"> 69</span> shift = 256;</div>
<div class="line"><span class="lineno"> 70</span> }</div>
<div class="line"><span class="lineno"> 71</span> <span class="comment">// Compute the actual start address of the chunk, prior to aligning it&#39;s address</span></div>
<div class="line"><span class="lineno"> 72</span> <span class="keyword">auto</span> pUnalignedChunk = pAlignedChunk - shift;</div>
<div class="line"><span class="lineno"> 73</span> <span class="keyword">delete</span>[] pUnalignedChunk;</div>
<div class="line"><span class="lineno"> 74</span> }</div>
<div class="line"><span class="lineno"> 75</span> }</div>
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<h2 class="memtitle"><span class="permalink"><a href="#ab078fdf361932eac77e00095a9896676">&#9670;&nbsp;</a></span>alignPointer()</h2>
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template&lt;typename T &gt; </div>
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<td class="memname">T * alignPointer </td>
<td>(</td>
<td class="paramtype">T *&#160;</td>
<td class="paramname"><em>ptr</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">std::size_t&#160;</td>
<td class="paramname"><em>alignment</em>&#160;</td>
</tr>
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<td></td>
<td>)</td>
<td></td><td></td>
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<div class="fragment"><div class="line"><span class="lineno"> 38</span> {</div>
<div class="line"><span class="lineno"> 39</span> <span class="keyword">const</span> std::uintptr_t address = <span class="keyword">reinterpret_cast&lt;</span>std::uintptr_t<span class="keyword">&gt;</span>(ptr);</div>
<div class="line"><span class="lineno"> 40</span> <span class="keyword">const</span> std::uintptr_t aligned = <a class="code hl_function" href="AlignedMemoryResource_8cpp.html#a1e2fd36ca37121582814c06f59e756e6">alignAddress</a>(address, alignment);</div>
<div class="line"><span class="lineno"> 41</span> <span class="keywordflow">return</span> <span class="keyword">reinterpret_cast&lt;</span>T*<span class="keyword">&gt;</span>(aligned);</div>
<div class="line"><span class="lineno"> 42</span> }</div>
<div class="ttc" id="aAlignedMemoryResource_8cpp_html_a1e2fd36ca37121582814c06f59e756e6"><div class="ttname"><a href="AlignedMemoryResource_8cpp.html#a1e2fd36ca37121582814c06f59e756e6">alignAddress</a></div><div class="ttdeci">std::uintptr_t alignAddress(std::uintptr_t address, std::size_t alignment)</div><div class="ttdef"><b>Definition:</b> AlignedMemoryResource.cpp:31</div></div>
</div><!-- fragment -->
<p class="reference">References <a class="el" href="AlignedMemoryResource_8cpp.html#a1e2fd36ca37121582814c06f59e756e6">alignAddress()</a>.</p>
<p class="reference">Referenced by <a class="el" href="AlignedMemoryResource_8cpp.html#ab8a1c145d376a36ae8ca2e4213b6f852">alignedAlloc()</a>.</p>
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