Amending ceil to std::ceil in Spectrum.cc

radixio/spectrum.cc

@@ -19,7 +19,7 @@ short Spectrum::nrps() const
     }
   }
 
-  short nrps = short(ceil((float(maxChannels) / 64.0) + 1.0));
+  short nrps = short(std::ceil((float(maxChannels) / 64.f) + 1.f));
 
   return nrps;
 }