Macro: ac_cxx_have_complex

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# ac_cxx_have_complex

## Synopsis

`AC_CXX_HAVE_COMPLEX`

## Version

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

## Author

Luc Maisonobe

## Description

If the compiler has complex<T>, define HAVE_COMPLEX.

## M4 Source Code

    AC_DEFUN([AC_CXX_HAVE_COMPLEX],
    [AC_CACHE_CHECK(whether the compiler has complex<T>,
    ac_cv_cxx_have_complex,
    [AC_REQUIRE([AC_CXX_NAMESPACES])
     AC_LANG_SAVE
     AC_LANG_CPLUSPLUS
     AC_TRY_COMPILE([#include <complex>
    #ifdef HAVE_NAMESPACES
    using namespace std;
    #endif],[complex<float> a; complex<double> b; return 0;],
     ac_cv_cxx_have_complex=yes, ac_cv_cxx_have_complex=no)
     AC_LANG_RESTORE
    ])
    if test "$ac_cv_cxx_have_complex" = yes; then
      AC_DEFINE(HAVE_COMPLEX,,[define if the compiler has complex<T>])
    fi
    ])