#include <cassert>
#include <string>

//Returns the extension of a filename
//Assumes that the filename has an extension
//From http://www.richelbilderbeek.nl/CppGetExtension.htm
const std::string GetExtension(const std::string& filename)
{
  const size_t i = filename.rfind('.');
  assert(i != std::string::npos && "Filename must contain a dot");
  assert(i != filename.size() - 1 && "Filename must not end with a dot");
  assert(filename[i+1] != '\\' && "Filename must have an extension");
  assert(filename[i+1] != '/' && "Filename must have an extension");
  return filename.substr(i+1,filename.size());
}