ACE/ace/Numeric_Limits.h

   1 // -*- C++ -*-
   2
   3 //=============================================================================
   4 /**
   5  * @file    Numeric_Limits.h
   6  *
   7  * Traits containing basic integer limits.  Useful for template-based
   8  * code on platforms that lack @c std::numeric_limits<>.
   9  *
  10  * @note These traits are not meant to be a replacement for
  11  *       @c std::numeric_limits<>.  Rather they are a crutch until all
  12  *       ACE-supported platforms also support
  13  *       @c std::numeric_limits<>.
  14  *
  15  * @internal   Only meant for internal use by ACE.
  16  * @deprecated This header will be removed once all platforms
  17  *             supported by ACE support @c std::numeric_limits<>.
  18  *
  19  * @author  Ossama Othman <ossama_othman at symantec dot com>
  20  */
  21 //=============================================================================
  22
  23 #ifndef ACE_NUMERIC_LIMITS_H
  24 #define ACE_NUMERIC_LIMITS_H
  25
  26 #include /**/ "ace/pre.h"
  27
  28 #include /**/ "ace/ACE_export.h"
  29
  30 #if !defined (ACE_LACKS_PRAGMA_ONCE)
  31 #  pragma once
  32 #endif /* ACE_LACKS_PRAGMA_ONCE */
  33
  34 #if defined __MINGW32__
  35 // Windows defines min/max macros that interfere with the
  36 // numeric_limits::min/max() traits.  Undefine those macros before
  37 // including <limits>.
  38 //
  39 // Ideally, we could prevent those macros from being defined by
  40 // defining the Windows-specific NOMINMAX symbol before any Windows
  41 // headers are included, preferably on the command line.  However,
  42 // that would probably break some applications.
  43 //
  44 // @@ Why isn't this a problem with MSVC++ and Borland builds?
  45 # undef min
  46 # undef max
  47 #endif  /* __MINGW32__ */
  48
  49 #include <limits>
  50
  51 // Address global namespace pollution potentially incurred by some
  52 // platforms.
  53 #undef min
  54 #undef max
  55
  56 ACE_BEGIN_VERSIONED_NAMESPACE_DECL
  57
  58 // std::numeric_limits<> has all of the necessary specializations.
  59 // Just wrap it.
  60 template <typename T>
  61 struct ACE_Numeric_Limits
  62 {
  63   static const T min () { return std::numeric_limits<T>::min (); }
  64   static const T max () { return std::numeric_limits<T>::max (); }
  65 };
  66
  67 ACE_END_VERSIONED_NAMESPACE_DECL
  68
  69 #include /**/ "ace/post.h"
  70
  71 #endif  /* ACE_NUMERIC_LIMITS_H */