AC_CXX_HAVE_FREEZE_SSTREAM
, 

2002年09月04日

Alain BARBET <alian@cpan.org>

GPLWithACException
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cryp.to ac-archive's C++ Support (released)

Check if the compiler has (need) freeze method call in stringstream/ strstream. Seems that Win32 and STLPort have it, libstdc++ not ...

Eg:

 #include <sstream>
 #ifdef HAVE_NAMESPACES
 using namespace std;
 #endif
 #ifdef HAVE_SSTREAM
 stringstream message;
 #else
 strstream message;
 #endif
 message << "Hello";
 #ifdef HAVE_FREEZE_SSTREAM
 message.freeze(0);
 #endif

AC_DEFUN([AC_CXX_HAVE_FREEZE_SSTREAM],
[AC_CACHE_CHECK(whether the compiler has freeze in stringstream,
ac_cv_cxx_have_freeze_sstream,
[AC_REQUIRE([AC_CXX_NAMESPACES])
 AC_REQUIRE([AC_CXX_HAVE_SSTREAM])
 AC_LANG_SAVE
 AC_LANG_CPLUSPLUS
 AC_TRY_COMPILE([#include <sstream>
#ifdef HAVE_NAMESPACES
using namespace std;
#endif],
[#ifdef HAVE_SSTREAM
stringstream message;
#else
strstream message;
#endif
message << "Hello"; message.freeze(0); return 0;],
 ac_cv_cxx_have_freeze_sstream=yes, ac_cv_cxx_have_freeze_sstream=no)
 AC_LANG_RESTORE
])
if test "$ac_cv_cxx_have_freeze_sstream" = yes; then
 AC_DEFINE(HAVE_FREEZE_SSTREAM,,[define if the compiler has freeze in
stringstream])
fi
])