AC_DEFUN([AC_CXX_USING_OPERATOR], | |
[AC_CACHE_CHECK( | |
whether compiler supports using ::operator<<, | |
ac_cv_cxx_using_operator, | |
[AC_LANG_SAVE | |
AC_LANG_CPLUSPLUS | |
AC_TRY_COMPILE([#include <iostream> | |
std::ostream& operator<<(std::ostream&, struct s);], | |
[using ::operator<<; return 0;], | |
ac_cv_cxx_using_operator=1, | |
ac_cv_cxx_using_operator=0) | |
AC_LANG_RESTORE]) | |
if test "$ac_cv_cxx_using_operator" = 1; then | |
AC_DEFINE(HAVE_USING_OPERATOR, 1, [define if the compiler supports using expression for operator]) | |
fi]) |