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Edit File: ax_cxx_complex_math_in_namespace_std.m4

# =========================================================================================
#  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::])])
])