PVS-Studio warning V547 for TPP

class basic_string
{
  ...
  size_type find(const _Elem *_Ptr, size_type _Off = 0) const
  ...
}

void
PipelineAnalysis::prepareFields(void) {
  ...
  if (peptideProphetOpts_.find(" PI ", 0)>=0) {
    fields_.push_back(Field("PpI_zscore"));
  }
  ...
}

This is what should have been written here: (peptideProphetOpts_.find(" PI ", 0) != string::npos).


This suspicious code was found in TPP project by PVS-Studio static code analyzer.
Warning message is:
V547 Expression 'peptideProphetOpts_.find(" PI ", 0) >= 0' is always true. Unsigned type value is always >= 0. pepXMLViewer pipelineanalysis.cxx 1590

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