ACE/protocols/ace/INet/IOS_util.h

   1 /**
   2  * @file IOS_util.h
   3  *
   4  * @author Martin Corino <mcorino@remedy.nl>
   5  */
   6
   7 #ifndef ACE_IOS_UTIL_H
   8 #define ACE_IOS_UTIL_H
   9
  10 #include /**/ "ace/pre.h"
  11
  12 #include "ace/INet/INet_Export.h"
  13 #include <iostream>
  14
  15 // ace_ios_init
  16 //
  17 // There is reported to be a bug in the Dinkumware
  18 // implementation of iostreams where calling
  19 // basic_ios::init() multiple times for the same
  20 // basic_ios instance creates a memory leak as a result
  21 // of the ios' locale being allocated more than
  22 // once, each time overwriting the old pointer.
  23 //
  24 // This usually happens in multiple inheritance
  25 // schemes involving a derived IOS class and a
  26 // derived IO stream class (i, o or io).
  27 //
  28 // The fix for Dinkumware is to not call init() in the
  29 // derived IOS class but call init() only for each
  30 // stream object - in the istream, ostream or
  31 // iostream constructor.
  32 //
  33 // Other stream implementations, however, require that
  34 // init() is called in the derived IOS constructor.
  35 // So we replace each call to init() with the
  36 // ace_ios_init macro defined below.
  37
  38
  39 #if !defined(ACE_IOS_INIT_FIX)
  40   // Microsoft Visual Studio with Dinkumware STL (but not STLport)
  41 # if defined(_MSC_VER) && (!defined(_STLP_MSVC) || defined(_STLP_NO_OWN_IOSTREAMS))
  42 #   define ACE_IOS_INIT_FIX 1
  43     // QNX with Dinkumware but not GNU C++ Library
  44 # elif defined(__QNX__) && !defined(__GLIBCPP__)
  45 #   define ACE_IOS_INIT_FIX 1
  46 # endif
  47 #endif
  48
  49 #if defined(ACE_IOS_INIT_FIX)
  50 # define ace_ios_init(buf)
  51 #else
  52 # define ace_ios_init(buf) this->init(buf)
  53 #endif
  54
  55 ACE_BEGIN_VERSIONED_NAMESPACE_DECL
  56
  57 namespace ACE
  58   {
  59     namespace IOS
  60       {
  61         class ACE_INET_Export Null
  62           {
  63             public:
  64               static std::ostream out_stream_;
  65               static std::istream in_stream_;
  66           };
  67       }
  68   }
  69
  70 ACE_END_VERSIONED_NAMESPACE_DECL
  71
  72 #include /**/ "ace/post.h"
  73 #endif /* ACE_IOS_UTIL_H */