extension.hpp

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#ifndef MLPACK_CORE_DATA_EXTENSION_HPP
#define MLPACK_CORE_DATA_EXTENSION_HPP

#include <mlpack/prereqs.hpp>

namespace mlpack {
namespace data {

inline std::string Extension(const std::string& filename)
{
  const size_t ext = filename.rfind('.');
  std::string extension;
  if (ext == std::string::npos)
    return extension;

  extension = filename.substr(ext + 1);
  std::transform(extension.begin(), extension.end(), extension.begin(),
      ::tolower);

  return extension;
}

} // namespace data
} // namespace mlpack

#endif