PrecisionWrapper.h

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// --------------------------------------------------------------------------
//                   OpenMS -- Open-Source Mass Spectrometry
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// Copyright The OpenMS Team -- Eberhard Karls University Tuebingen,
// ETH Zurich, and Freie Universitaet Berlin 2002-2020.
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// $Maintainer: Timo Sachsenberg $
// $Authors: Marc Sturm, Clemens Groepl $
// --------------------------------------------------------------------------
 
#pragma once
 
#include <OpenMS/config.h>
#include <OpenMS/CONCEPT/Types.h>
#include <OpenMS/DATASTRUCTURES/String.h>
#include <iostream>
 
namespace OpenMS
{
 
  template <typename FloatingPointType>
  struct PrecisionWrapper
  {
    explicit PrecisionWrapper(const FloatingPointType rhs) :
      ref_(rhs) {}
    PrecisionWrapper(const PrecisionWrapper & rhs) :
      ref_(rhs.ref_) {}
    FloatingPointType const ref_;
private:
    PrecisionWrapper();     // intentionally not implemented
  };
 
  template <typename FloatingPointType>
  inline const PrecisionWrapper<FloatingPointType> precisionWrapper(const FloatingPointType rhs)
  {
    return PrecisionWrapper<FloatingPointType>(rhs);
  }
 
  template <typename FloatingPointType>
  inline std::ostream & operator<<(std::ostream & os, const PrecisionWrapper<FloatingPointType> & rhs)
  {
    // manual conversion to String is much faster than ostreams internal conversion
    // (this calls the correct overload for extra precision)
    String s(rhs.ref_, true);
    os << s;
    return os;
  }
} // namespace OpenMS