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<p class="MsoNormal" style="text-align:left;direction:ltr;unicode-bidi:embed"><o:p> </o:p></p>
<p class="MsoNormal" style="text-align:left;direction:ltr;unicode-bidi:embed"><span style="color:#1F497D">I am now testing blocks usage in OpenCL.<o:p></o:p></span></p>
<p class="MsoNormal" style="text-align:left;direction:ltr;unicode-bidi:embed"><span style="color:#1F497D">I noticed that Clang forbids using an arrays within blocks (Clang forbid array capturing)<o:p></o:p></span></p>
<p class="MsoNormal" style="text-align:left;direction:ltr;unicode-bidi:embed"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-align:left;direction:ltr;unicode-bidi:embed"><span style="color:#1F497D">For Example, the following code will fail to compile because there is a reference to an array within a block.<o:p></o:p></span></p>
<p class="MsoNormal" style="text-align:left;direction:ltr;unicode-bidi:embed"><span style="color:#1F497D">But if the line referring to block will comment out and the line with reference to integer pointer ('j') will comment in, the code will pass.<o:p></o:p></span></p>
<p class="MsoNormal" style="text-align:left;direction:ltr;unicode-bidi:embed"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:1.0in;text-align:left;text-autospace:none;direction:ltr;unicode-bidi:embed">
<span style="font-size:9.5pt;font-family:Consolas;color:blue">void</span><span style="font-size:9.5pt;font-family:Consolas"> block_arr()<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:1.0in;text-align:left;text-autospace:none;direction:ltr;unicode-bidi:embed">
<span style="font-size:9.5pt;font-family:Consolas">{<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:1.0in;text-align:left;text-autospace:none;direction:ltr;unicode-bidi:embed">
<span style="font-size:9.5pt;font-family:Consolas"> <span style="color:blue">int</span> res = 0;<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:1.0in;text-align:left;text-autospace:none;direction:ltr;unicode-bidi:embed">
<span style="font-size:9.5pt;font-family:Consolas"> <span style="color:blue">int</span> i[4] = { 3, 4, 4, 1 };<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:1.0in;text-align:left;text-autospace:none;direction:ltr;unicode-bidi:embed">
<span style="font-size:9.5pt;font-family:Consolas"> <span style="color:blue">int</span>* j = i;<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:1.0in;text-align:left;text-autospace:none;direction:ltr;unicode-bidi:embed">
<span style="font-size:9.5pt;font-family:Consolas"> <o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:1.0in;text-align:left;text-autospace:none;direction:ltr;unicode-bidi:embed">
<span style="font-size:9.5pt;font-family:Consolas"> <span style="color:blue">int</span> (^test_block )(<span style="color:blue">int</span>) = ^(<span style="color:blue">int</span> num)<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:1.0in;text-align:left;text-autospace:none;direction:ltr;unicode-bidi:embed">
<span style="font-size:9.5pt;font-family:Consolas"> {<o:p></o:p></span></p>
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<span style="font-size:9.5pt;font-family:Consolas"> <span style="color:blue">
return</span> num + i[1]; <span style="color:green">// This is an error: "error: cannot refer to declaration with an array type inside block"</span><o:p></o:p></span></p>
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<span style="font-size:9.5pt;font-family:Consolas;color:green">// return num + j[1]; // This would work</span><span style="font-size:9.5pt;font-family:Consolas"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:1.0in;text-align:left;text-autospace:none;direction:ltr;unicode-bidi:embed">
<span style="font-size:9.5pt;font-family:Consolas"> };<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:1.0in;text-align:left;text-autospace:none;direction:ltr;unicode-bidi:embed">
<span style="font-size:9.5pt;font-family:Consolas"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:1.0in;text-align:left;text-autospace:none;direction:ltr;unicode-bidi:embed">
<span style="font-size:9.5pt;font-family:Consolas"> res = test_block(7);<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:1.0in;text-align:left;text-autospace:none;direction:ltr;unicode-bidi:embed">
<span style="font-size:9.5pt;font-family:Consolas">}<o:p></o:p></span></p>
<p class="MsoNormal" style="text-align:left;direction:ltr;unicode-bidi:embed"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-align:left;direction:ltr;unicode-bidi:embed"><o:p> </o:p></p>
<p class="MsoNormal" style="text-align:left;direction:ltr;unicode-bidi:embed"><span style="color:#1F497D">Do you know what is the reason behind this limitation?<o:p></o:p></span></p>
<p class="MsoNormal" style="text-align:left;direction:ltr;unicode-bidi:embed"><span style="color:#1F497D">And why it is possible to use a regular pointers but arrays are forbidden?<o:p></o:p></span></p>
<p class="MsoNormal" style="text-align:left;direction:ltr;unicode-bidi:embed"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-align:left;direction:ltr;unicode-bidi:embed"><span style="color:#1F497D">Thanks,<o:p></o:p></span></p>
<p class="MsoNormal" style="text-align:left;direction:ltr;unicode-bidi:embed"><span style="color:#1F497D">Arik<o:p></o:p></span></p>
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