文件操作 - ax_cxx_use_numtrait.m4
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文件: /usr/share/aclocal/ax_cxx_use_numtrait.m4
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# =========================================================================== # https://www.gnu.org/software/autoconf-archive/ax_cxx_use_numtrait.html # =========================================================================== # # SYNOPSIS # # AX_CXX_USE_NUMTRAIT # # DESCRIPTION # # If the compiler supports numeric traits promotions, define # HAVE_USE_NUMTRAIT. # # 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_USE_NUMTRAIT], [AX_CXX_USE_NUMTRAIT]) AC_DEFUN([AX_CXX_USE_NUMTRAIT], [AC_CACHE_CHECK(whether the compiler supports numeric traits promotions, ax_cv_cxx_use_numtrait, [AC_REQUIRE([AX_CXX_TYPENAME]) AC_LANG_SAVE AC_LANG_CPLUSPLUS AC_TRY_COMPILE([ #ifndef HAVE_TYPENAME #define typename #endif template<class T_numtype> class SumType { public : typedef T_numtype T_sumtype; }; template<> class SumType<char> { public : typedef int T_sumtype; }; template<class T> class A {}; template<class T> A<typename SumType<T>::T_sumtype> sum(A<T>) { return A<typename SumType<T>::T_sumtype>(); } ],[A<float> x; sum(x); return 0;], ax_cv_cxx_use_numtrait=yes, ax_cv_cxx_use_numtrait=no) AC_LANG_RESTORE ]) if test "$ax_cv_cxx_use_numtrait" = yes; then AC_DEFINE(HAVE_USE_NUMTRAIT,,[define if the compiler supports numeric traits promotions]) fi ])
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