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ax_cxx_template_qualified_base_class.m4
# ========================================================================================= # https://www.gnu.org/software/autoconf-archive/ax_cxx_template_qualified_base_class.html # ========================================================================================= # # SYNOPSIS # # AX_CXX_TEMPLATE_QUALIFIED_BASE_CLASS # # DESCRIPTION # # If the compiler supports template-qualified base class specifiers, # define HAVE_TEMPLATE_QUALIFIED_BASE_CLASS. # # LICENSE # # Copyright (c) 2008 Todd Veldhuizen # Copyright (c) 2008 Luc Maisonobe <luc@spaceroots.org> # # Copying and distribution of this file, with or without modification, are # permitted in any medium without royalty provided the copyright notice # and this notice are preserved. This file is offered as-is, without any # warranty. #serial 7 AU_ALIAS([AC_CXX_TEMPLATE_QUALIFIED_BASE_CLASS], [AX_CXX_TEMPLATE_QUALIFIED_BASE_CLASS]) AC_DEFUN([AX_CXX_TEMPLATE_QUALIFIED_BASE_CLASS], [AC_CACHE_CHECK(whether the compiler supports template-qualified base class specifiers, ax_cv_cxx_template_qualified_base_class, [AC_REQUIRE([AX_CXX_TYPENAME]) AC_REQUIRE([AX_CXX_FULL_SPECIALIZATION_SYNTAX]) AC_LANG_SAVE AC_LANG_CPLUSPLUS AC_TRY_COMPILE([ #ifndef HAVE_TYPENAME #define typename #endif class Base1 { public : int f () const { return 1; } }; class Base2 { public : int f () const { return 0; } }; template<class X> struct base_trait { typedef Base1 base; }; #ifdef HAVE_FULL_SPECIALIZATION_SYNTAX template<> struct base_trait<float> { typedef Base2 base; }; #else struct base_trait<float> { typedef Base2 base; }; #endif template<class T> class Weird : public base_trait<T>::base { public : typedef typename base_trait<T>::base base; int g () const { return base::f (); } };],[ Weird<float> z; return z.g ();], ax_cv_cxx_template_qualified_base_class=yes, ax_cv_cxx_template_qualified_base_class=no) AC_LANG_RESTORE ]) if test "$ax_cv_cxx_template_qualified_base_class" = yes; then AC_DEFINE(HAVE_TEMPLATE_QUALIFIED_BASE_CLASS,, [define if the compiler supports template-qualified base class specifiers]) fi ])