文件操作 - ax_cxx_complex_math_in_namespace_std.m4
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文件: /usr/share/aclocal/ax_cxx_complex_math_in_namespace_std.m4
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# ========================================================================================= # https://www.gnu.org/software/autoconf-archive/ax_cxx_complex_math_in_namespace_std.html # ========================================================================================= # # SYNOPSIS # # AX_CXX_COMPLEX_MATH_IN_NAMESPACE_STD # # DESCRIPTION # # If the C math functions are in the cmath header file and std:: # namespace, define HAVE_MATH_FN_IN_NAMESPACE_STD. # # 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 8 AU_ALIAS([AC_CXX_COMPLEX_MATH_IN_NAMESPACE_STD], [AX_CXX_COMPLEX_MATH_IN_NAMESPACE_STD]) AC_DEFUN([AX_CXX_COMPLEX_MATH_IN_NAMESPACE_STD], [dnl AC_CACHE_CHECK([whether complex math functions are in std::], ax_cv_cxx_complex_math_in_namespace_std, [AC_REQUIRE([AX_CXX_NAMESPACE_STD]) AS_IF([test "X$ax_cv_cxx_have_std_namespace" = Xyes], [dnl AC_LANG_PUSH([C++]) AC_COMPILE_IFELSE([dnl AC_LANG_PROGRAM([ #include <complex> namespace S { using namespace std; complex<float> pow(complex<float> x, complex<float> y) { return std::pow(x,y); } };], [dnl using namespace S; complex<float> x = 1.0, y = 1.0; S::pow(x,y); return 0; ])], ax_cv_cxx_complex_math_in_namespace_std=yes, ax_cv_cxx_complex_math_in_namespace_std=no) AC_LANG_POP([C++]) ], [ax_cv_cxx_complex_math_in_namespace_std=no]) ]) AS_IF([test "X$ax_cv_cxx_complex_math_in_namespace_std" = Xyes], [AC_DEFINE(HAVE_COMPLEX_MATH_IN_NAMESPACE_STD,,dnl [define if complex math functions are in std::])]) ])
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