Amending nrps() function to use stl library

radixio/spectrum.cc

+#include <algorithm>
 #include <cmath>
 
 #include "radixio/spectrum.hh"
@@ -10,14 +11,12 @@ short Spectrum::nrps() const
   // Used by PCF file to allocate space in binary file structure
 
   // Go through each SpectrumData object and find the maximum number of channels
-  int maxChannels = 0;
-  for (size_t i = 0; i < mSpectrumData.size(); ++i)
-  {
-    if (mSpectrumData[i].numberOfChannels > maxChannels)
-    {
-      maxChannels = mSpectrumData[i].numberOfChannels;
-    }
-  }
+  auto comparator = [](const SpectrumData &a, const SpectrumData &b) {
+    return a.numberOfChannels < b.numberOfChannels;
+  };
+  int maxChannels = (*std::max_element(mSpectrumData.begin(),
+                                       mSpectrumData.end(), comparator))
+                        .numberOfChannels;
 
   short nrps = short(std::ceil((float(maxChannels) / 64.f) + 1.f));