Macro: ac_cxx_complex_math_in_namespace_std

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# ac_cxx_complex_math_in_namespace_std

## Synopsis

`AC_CXX_COMPLEX_MATH_IN_NAMESPACE_STD`

## Version

1.1.1.1 (2001/07/26) C++_Support @ ac-archive-0.5.32

## Author

Luc Maisonobe

## Description

If the C math functions are in the cmath header file and std:: namespace, define HAVE_MATH_FN_IN_NAMESPACE_STD.

## M4 Source Code

    AC_DEFUN([AC_CXX_COMPLEX_MATH_IN_NAMESPACE_STD],
    [AC_CACHE_CHECK(whether complex math functions are in std::,
    ac_cv_cxx_complex_math_in_namespace_std,
    [AC_REQUIRE([AC_CXX_NAMESPACES])
     AC_LANG_SAVE
     AC_LANG_CPLUSPLUS
     AC_TRY_COMPILE([#include <complex>
    namespace S { using namespace std;
                  complex<float> pow(complex<float> x, complex<float> y)
                  { return std::pow(x,y); }
                };
    ],[using namespace S; complex<float> x = 1.0, y = 1.0; S::pow(x,y); return 0;],
     ac_cv_cxx_complex_math_in_namespace_std=yes, ac_cv_cxx_complex_math_in_namespace_std=no)
     AC_LANG_RESTORE
    ])
    if test "$ac_cv_cxx_complex_math_in_namespace_std" = yes; then
      AC_DEFINE(HAVE_COMPLEX_MATH_IN_NAMESPACE_STD,,
                [define if complex math functions are in std::])
    fi
    ])