File: stl_namespace.m4

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# We check what namespace stl code like vector expects to be executed in

AC_DEFUN([AC_CXX_STL_NAMESPACE],
  [AC_CACHE_CHECK(
      what namespace STL code is in,
      ac_cv_cxx_stl_namespace,
      [AC_REQUIRE([AC_CXX_NAMESPACES])
      AC_LANG_SAVE
      AC_LANG_CPLUSPLUS
      AC_TRY_COMPILE([#include <vector>],
                     [vector<int> t; return 0;],
                     ac_cv_cxx_stl_namespace=none)
      AC_TRY_COMPILE([#include <vector>],
                     [std::vector<int> t; return 0;],
                     ac_cv_cxx_stl_namespace=std)
      AC_LANG_RESTORE])
   if test "$ac_cv_cxx_stl_namespace" = none; then
      AC_DEFINE(STL_NAMESPACE,,
                [the namespace where STL code like vector<> is defined])
   fi
   if test "$ac_cv_cxx_stl_namespace" = std; then
      AC_DEFINE(STL_NAMESPACE,std,
                [the namespace where STL code like vector<> is defined])
   fi
])