31 lines
1.2 KiB
Plaintext
31 lines
1.2 KiB
Plaintext
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dnl Available from the GNU Autoconf Macro Archive at:
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dnl http://www.gnu.org/software/ac-archive/htmldoc/ac_cxx_template_qualified_base_class.html
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dnl
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AC_DEFUN([AC_CXX_TEMPLATE_QUALIFIED_BASE_CLASS],
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[AC_CACHE_CHECK(whether the compiler supports template-qualified base class specifiers,
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ac_cv_cxx_template_qualified_base_class,
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[AC_REQUIRE([AC_CXX_TYPENAME])
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AC_LANG_SAVE
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AC_LANG_CPLUSPLUS
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AC_TRY_COMPILE([
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#ifndef HAVE_TYPENAME
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#define typename
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#endif
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class Base1 { public : int f () const { return 1; } };
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class Base2 { public : int f () const { return 0; } };
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template<class X> struct base_trait { typedef Base1 base; };
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struct base_trait<float> { typedef Base2 base; };
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template<class T> class Weird : public base_trait<T>::base
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{ public :
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typedef typename base_trait<T>::base base;
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int g () const { return f (); }
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};],[ Weird<float> z; return z.g ();],
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ac_cv_cxx_template_qualified_base_class=yes, ac_cv_cxx_template_qualified_base_class=no)
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AC_LANG_RESTORE
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])
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if test "$ac_cv_cxx_template_qualified_base_class" = yes; then
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AC_DEFINE(HAVE_TEMPLATE_QUALIFIED_BASE_CLASS,,
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[define if the compiler supports template-qualified base class specifiers])
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fi
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])
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