Macro: ac_cxx_namespaces

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# ac_cxx_namespaces

## Synopsis

`AC_CXX_NAMESPACES`

## Version

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

## Author

Luc Maisonobe

## Description

If the compiler can prevent names clashes using namespaces, define HAVE_NAMESPACES.

## M4 Source Code

    AC_DEFUN([AC_CXX_NAMESPACES],
    [AC_CACHE_CHECK(whether the compiler implements namespaces,
    ac_cv_cxx_namespaces,
    [AC_LANG_SAVE
     AC_LANG_CPLUSPLUS
     AC_TRY_COMPILE([namespace Outer { namespace Inner { int i = 0; }}],
                    [using namespace Outer::Inner; return i;],
     ac_cv_cxx_namespaces=yes, ac_cv_cxx_namespaces=no)
     AC_LANG_RESTORE
    ])
    if test "$ac_cv_cxx_namespaces" = yes; then
      AC_DEFINE(HAVE_NAMESPACES,,[define if the compiler implements namespaces])
    fi
    ])