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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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