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// -*- C++ -*-
//=============================================================================
/**
* @file Truncate.h
*
* $Id$
*
* @author Steve Huston <shuston@riverace.com>
*/
//=============================================================================
#ifndef ACE_TRUNCATE_H
#define ACE_TRUNCATE_H
#include /**/ "ace/pre.h"
#include "ace/config-all.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */
#include "ace/Global_Macros.h"
#if !defined(ACE_LACKS_NUMERIC_LIMITS)
// some platforms pollute the namespace by defining max() and min() macros
# ifdef max
# undef max
# endif
# ifdef min
# undef min
# endif
# include <limits>
#else
# include "ace/os_include/os_limits.h"
#endif /* ACE_LACKS_NUMERIC_LIMITS */
ACE_BEGIN_VERSIONED_NAMESPACE_DECL
namespace ACE_Utils
{
/**
* @class Truncate
*
* @brief Helper function to truncate an integral value to an int.
*
* Very useful since ACE methods return int very often and the value's
* source is often a different-size integral type, such as size_t.
* This function hides the truncation logic and resolves compiler
* diagnostics.
*
* @internal Internal use only.
*/
template<typename X>
inline int Truncate (const X& val)
{
#if !defined (ACE_LACKS_NUMERIC_LIMITS)
if (val > static_cast<X> (std::numeric_limits<int>::max ()))
return std::numeric_limits<int>::max ();
#else
if (val > static_cast<X> (INT_MAX))
return INT_MAX;
#endif /* ACE_LACKS_NUMERIC_LIMITS */
return static_cast<int> (val);
}
// Specialize one for size_t to alleviate the explicit instantiation pain.
template<>
inline int Truncate<size_t> (const size_t& val)
{
#if !defined (ACE_LACKS_NUMERIC_LIMITS)
if (val > static_cast<size_t> (std::numeric_limits<int>::max ()))
return std::numeric_limits<int>::max ();
#else
if (val > static_cast<size_t> (INT_MAX))
return INT_MAX;
#endif /* ACE_LACKS_NUMERIC_LIMITS */
return static_cast<int> (val);
}
} // namespace ACE_Utils
ACE_END_VERSIONED_NAMESPACE_DECL
#include /**/ "ace/post.h"
#endif /* ACE_TRUNCATE_H*/
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