文件操作 - ax_cxx_explicit_template_function_qualification.m4
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文件: /usr/share/aclocal/ax_cxx_explicit_template_function_qualification.m4
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# ==================================================================================================== # https://www.gnu.org/software/autoconf-archive/ax_cxx_explicit_template_function_qualification.html # ==================================================================================================== # # SYNOPSIS # # AX_CXX_EXPLICIT_TEMPLATE_FUNCTION_QUALIFICATION # # DESCRIPTION # # If the compiler supports explicit template function qualification, # define HAVE_EXPLICIT_TEMPLATE_FUNCTION_QUALIFICATION. # # 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_EXPLICIT_TEMPLATE_FUNCTION_QUALIFICATION], [AX_CXX_EXPLICIT_TEMPLATE_FUNCTION_QUALIFICATION]) AC_DEFUN([AX_CXX_EXPLICIT_TEMPLATE_FUNCTION_QUALIFICATION], [AC_CACHE_CHECK(whether the compiler supports explicit template function qualification, ax_cv_cxx_explicit_template_function_qualification, [AC_LANG_SAVE AC_LANG_CPLUSPLUS AC_TRY_COMPILE([ template<class Z> class A { public : A() {} }; template<class X, class Y> A<X> to (const A<Y>&) { return A<X>(); } ],[A<float> x; A<double> y = to<double>(x); return 0;], ax_cv_cxx_explicit_template_function_qualification=yes, ax_cv_cxx_explicit_template_function_qualification=no) AC_LANG_RESTORE ]) if test "$ax_cv_cxx_explicit_template_function_qualification" = yes; then AC_DEFINE(HAVE_EXPLICIT_TEMPLATE_FUNCTION_QUALIFICATION,, [define if the compiler supports explicit template function qualification]) fi ])
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