Help/Streams-Patterns-Events/Patterns/Pprotect.html

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  24 <p class="p1"><span class="s1"><b>Pprotect<span class="Apple-tab-span"> </span></b></span><span class="Apple-tab-span"> </span><span class="Apple-tab-span">    </span><b>evaluate a function when an error occured in the thread</b></p>
  25 <p class="p2"><br></p>
  26 <p class="p1">superclass: FilterPattern</p>
  27 <p class="p2"><br></p>
  28 <p class="p2"><br></p>
  29 <p class="p1"><b>Pprotect(pattern func)</b></p>
  30 <p class="p2"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span></p>
  31 <p class="p1"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span><b>pattern<span class="Apple-tab-span">  </span><span class="Apple-tab-span">    </span></b>any pattern</p>
  32 <p class="p1"><b><span class="Apple-tab-span">  </span><span class="Apple-tab-span">    </span>func<span class="Apple-tab-span">        </span><span class="Apple-tab-span">    </span></b><span class="Apple-tab-span">        </span>the function to be evaluated when an error occurs.<span class="Apple-converted-space"> </span></p>
  33 <p class="p1"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span><span class="Apple-tab-span">    </span><span class="Apple-tab-span">    </span><span class="Apple-tab-span">    </span>The error and the thread are passed as arguments to the function.<span class="Apple-tab-span">   </span></p>
  34 <p class="p3"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span></p>
  35 <p class="p3"><br></p>
  36 <p class="p4">// example</p>
  37 <p class="p5"><br></p>
  38 <p class="p6">(</p>
  39 <p class="p6"><span class="s2">var</span> x;</p>
  40 <p class="p6"><span class="s2">var</span> func = { <span class="s3">"an error happened"</span>.postln };</p>
  41 <p class="p6">a = <span class="s2">Pprotect</span>(<span class="s2">Pseq</span>([1, 3, 3, <span class="s2">Pfuncn</span>({ <span class="s2">Error</span>.throw }), 2]), func);</p>
  42 <p class="p6">x = <span class="s2">Pbind</span>(<span class="s4">\degree</span>, a, <span class="s4">\dur</span>, 0.5).play;</p>
  43 <p class="p6">)</p>
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