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ax_cxx_template_qualified_return_type.m4
# ========================================================================================== # https://www.gnu.org/software/autoconf-archive/ax_cxx_template_qualified_return_type.html # ========================================================================================== # # SYNOPSIS # # AX_CXX_TEMPLATE_QUALIFIED_RETURN_TYPE # # DESCRIPTION # # If the compiler supports template-qualified return types, define # HAVE_TEMPLATE_QUALIFIED_RETURN_TYPE. # # 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_RETURN_TYPE], [AX_CXX_TEMPLATE_QUALIFIED_RETURN_TYPE]) AC_DEFUN([AX_CXX_TEMPLATE_QUALIFIED_RETURN_TYPE], [AC_CACHE_CHECK(whether the compiler supports template-qualified return types, ax_cv_cxx_template_qualified_return_type, [AC_REQUIRE([AX_CXX_TYPENAME]) AC_LANG_SAVE AC_LANG_CPLUSPLUS AC_TRY_COMPILE([ #ifndef HAVE_TYPENAME #define typename #endif template<class X, class Y> struct promote_trait { typedef X T; }; template<> struct promote_trait<int, float> { typedef float T; }; template<class T> class A { public : A () {} }; template<class X, class Y> A<typename promote_trait<X,Y>::T> operator+ (const A<X>&, const A<Y>&) { return A<typename promote_trait<X,Y>::T>(); } ],[A<int> x; A<float> y; A<float> z = x + y; return 0;], ax_cv_cxx_template_qualified_return_type=yes, ax_cv_cxx_template_qualified_return_type=no) AC_LANG_RESTORE ]) if test "$ax_cv_cxx_template_qualified_return_type" = yes; then AC_DEFINE(HAVE_TEMPLATE_QUALIFIED_RETURN_TYPE,, [define if the compiler supports template-qualified return types]) fi ])