| Austin Schuh | 906616c | 2019-01-21 20:25:11 -0800 | [diff] [blame^] | 1 | AC_DEFUN([AC_CXX_USING_OPERATOR], |
| 2 | [AC_CACHE_CHECK( |
| 3 | whether compiler supports using ::operator<<, |
| 4 | ac_cv_cxx_using_operator, |
| 5 | [AC_LANG_SAVE |
| 6 | AC_LANG_CPLUSPLUS |
| 7 | AC_TRY_COMPILE([#include <iostream> |
| 8 | std::ostream& operator<<(std::ostream&, struct s);], |
| 9 | [using ::operator<<; return 0;], |
| 10 | ac_cv_cxx_using_operator=1, |
| 11 | ac_cv_cxx_using_operator=0) |
| 12 | AC_LANG_RESTORE]) |
| 13 | if test "$ac_cv_cxx_using_operator" = 1; then |
| 14 | AC_DEFINE(HAVE_USING_OPERATOR, 1, [define if the compiler supports using expression for operator]) |
| 15 | fi]) |