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Diffstat (limited to 'examples/Export/dll.h')
-rw-r--r-- | examples/Export/dll.h | 69 |
1 files changed, 0 insertions, 69 deletions
diff --git a/examples/Export/dll.h b/examples/Export/dll.h deleted file mode 100644 index b07d3fe1cd8..00000000000 --- a/examples/Export/dll.h +++ /dev/null @@ -1,69 +0,0 @@ -// $Id$ - -// To use the export macros with a DLL, a file will need to be -// created (see ACE_wrapper/bin/generate_export_file.pl) and -// included. This file defines Test_Export (and the -// TEST_SINGLETON_* macros). -#include "test_export.h" - -#include "ace/Singleton.h" -#include "ace/Null_Mutex.h" - -#define RETVAL 42 - -// To expose a function outside of a DLL, use the *_Export -// at the beginning of the function declaration. - -Test_Export int test_function (); - -// To expose data, put use the *Export at the beginning -// of the variable declaration. The extern is required when -// building static libraries. - -extern Test_Export int test_variable; - -// To expose a class, put the *_Export between "class" -// and the class name. - -class Test_Export test_class -{ -public: - int method (); -}; - -// ACE_Singleton and its relatives are special cases. The problem is -// that ACE_Singleton is a template. If the singleton is used in both -// the DLL and the executable linking the DLL, then two instances of -// the singleton will be used (which defeats the purpose of a Singleton). -// -// This occurs because the ACE_Singleton template is expanded in both -// places because Visual C++ and Borland C++ do this automatically by -// including the template source. This in turn creates two copies of -// the static member variable. -// -// So to get around this problem, the *_SINGLETON_DECLARE macro is -// used to instruct the compiler to not create the second copy in the -// program. This macro solution does not work for Borland C++, so for -// this compiler you must explicitly disable the template instantiation -// using a #pragma (or use the other workaround below). -// -// Another workaround for this is to not to expose the Singleton itself -// to the outside world, but to instead supply a function or static -// member function that returns the singleton to the executable -// (like get_dll_singleton () does below). - -#if defined (__BORLANDC__) -# if !defined (TEST_BUILD_DLL) -# pragma option push -Jgx -# endif -#endif -TEST_SINGLETON_DECLARE (ACE_Singleton, test_class, ACE_Null_Mutex) -#if defined (__BORLANDC__) -# if !defined (TEST_BUILD_DLL) -# pragma option pop -# endif -#endif - -typedef ACE_Singleton<test_class, ACE_Null_Mutex> TEST_SINGLETON; - -Test_Export test_class *get_dll_singleton (); |