cctbx/eltbx/wavelengths.h

#ifndef CCTBX_ELTBX_WAVELENGTHS_H
#define CCTBX_ELTBX_WAVELENGTHS_H

#include <scitbx/constants.h>
#include <string>

namespace cctbx { namespace eltbx { namespace wavelengths {

  namespace detail
  {
    struct raw
    {
      const char* label;
      float       value;
    };
  }

  class characteristic
  {
    public:
      characteristic() : raw_(0) {}


      characteristic(std::string const& label);


      bool
      is_valid() const { return raw_->value != 0; }


      const char*
      label() const
      {
        return raw_->label;
      }


      float
      as_angstrom() const
      {
        return raw_->value;
      }


      float
      as_kev() const
      {
        if (raw_->value == 0.) return 0.;
        return scitbx::constants::factor_kev_angstrom / raw_->value;
      }


      float
      as_ev() const { return as_kev() * 1000; }

    private:
      const detail::raw* raw_;
      friend class characteristic_iterator;
  };

  class characteristic_iterator
  {
    public:
      characteristic_iterator();


      characteristic
      next();

    private:
      characteristic current_;
  };

}}} // cctbx::eltbx::wavelengths

#endif // CCTBX_ELTBX_WAVELENGTHS_H

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