Identity.h

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// -*- C++ -*-

#if !defined(__ads_Identity_h__)
#define __ads_Identity_h__

#include "../defs.h"

#include <functional>

BEGIN_NAMESPACE_ADS

//-----------------------------------------------------------------------------
// @{

template<typename T>
struct Identity : 
  public std::unary_function<T,T> {
  T&
  operator()(T& x) const { 
    return x; 
  }

  const T&
  operator()(const T& x) const { 
    return x; 
  }
};

template<typename T>
inline
Identity<T>
identity() {
  return Identity<T>();
}

// @}

END_NAMESPACE_ADS

#endif

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