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