// (C) Copyright David Abrahams 2002.

// (C) Copyright Jeremy Siek    2002.

// (C) Copyright Thomas Witt    2002.

// Distributed under the Boost Software License, Version 1.0. (See

// accompanying file LICENSE_1_0.txt or copy at

// http://www.boost.org/LICENSE_1_0.txt)

// no include guard multiple inclusion intended

//

// This is a temporary workaround until the bulk of this is

// available in boost config.

// 23/02/03 thw

//

#include <boost/config.hpp> // for prior

#include <boost/detail/workaround.hpp>

#ifdef BOOST_ITERATOR_CONFIG_DEF

# error you have nested config_def #inclusion.

#else 

# define BOOST_ITERATOR_CONFIG_DEF

#endif 

// We enable this always now.  Otherwise, the simple case in

// libs/iterator/test/constant_iterator_arrow.cpp fails to compile

// because the operator-> return is improperly deduced as a non-const

// pointer.

#if 1 || defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)           \

    || BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x531))

// Recall that in general, compilers without partial specialization

// can't strip constness.  Consider counting_iterator, which normally

// passes a const Value to iterator_facade.  As a result, any code

// which makes a std::vector of the iterator's value_type will fail

// when its allocator declares functions overloaded on reference and

// const_reference (the same type).

//

// Furthermore, Borland 5.5.1 drops constness in enough ways that we

// end up using a proxy for operator[] when we otherwise shouldn't.

// Using reference constness gives it an extra hint that it can

// return the value_type from operator[] directly, but is not

// strictly necessary.  Not sure how best to resolve this one.

# define BOOST_ITERATOR_REF_CONSTNESS_KILLS_WRITABILITY 1

#endif

#if BOOST_WORKAROUND(BOOST_MSVC, <= 1300)                                       \

    || BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x531))                   \

    || (BOOST_WORKAROUND(BOOST_INTEL_CXX_VERSION, <= 700) && defined(_MSC_VER)) \

    || BOOST_WORKAROUND(__DECCXX_VER, BOOST_TESTED_AT(60590042))

# define BOOST_NO_LVALUE_RETURN_DETECTION

# if 0 // test code

  struct v  {};

  typedef  char (&no)[3];

  template <class T>

  no foo(T const&, ...);

  template <class T>

  char foo(T&, int);

  struct value_iterator

  {

      v operator*() const;

  };

  template <class T>

  struct lvalue_deref_helper

  {

      static T& x;

      enum { value = (sizeof(foo(*x,0)) == 1) };

  };

  int z2[(lvalue_deref_helper<v*>::value == 1) ? 1 : -1];

  int z[(lvalue_deref_helper<value_iterator>::value) == 1 ? -1 : 1 ];

# endif 

#endif

#if BOOST_WORKAROUND(__MWERKS__, <=0x2407)

#  define BOOST_NO_IS_CONVERTIBLE // "is_convertible doesn't work for simple types"

#endif

#if BOOST_WORKAROUND(__GNUC__, == 2)                                                                            \

    || BOOST_WORKAROUND(__GNUC__, == 3) && BOOST_WORKAROUND(__GNUC_MINOR__, < 4) && !defined(__EDG_VERSION__)   \

    || BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x551))

#  define BOOST_NO_IS_CONVERTIBLE_TEMPLATE // The following program fails to compile:

#  if 0 // test code

    #include <boost/type_traits/is_convertible.hpp>

    template <class T>

    struct foo

    {

        foo(T);

        template <class U>

        foo(foo<U> const& other) : p(other.p) { }

        T p;

    };

    bool x = boost::is_convertible<foo<int const*>, foo<int*> >::value;

#  endif

#endif

#if !defined(BOOST_MSVC) && (defined(BOOST_NO_SFINAE) || defined(BOOST_NO_IS_CONVERTIBLE) || defined(BOOST_NO_IS_CONVERTIBLE_TEMPLATE))

# define BOOST_NO_STRICT_ITERATOR_INTEROPERABILITY

#endif 

# if !BOOST_WORKAROUND(BOOST_MSVC, <= 1300)

#  define BOOST_ARG_DEPENDENT_TYPENAME typename

# else

#  define BOOST_ARG_DEPENDENT_TYPENAME

# endif

# if BOOST_WORKAROUND(__GNUC__, == 2) && BOOST_WORKAROUND(__GNUC_MINOR__, BOOST_TESTED_AT(95)) \

    || BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x564))

// GCC-2.95 eagerly instantiates templated constructors and conversion

// operators in convertibility checks, causing premature errors.

//

// Borland's problems are harder to diagnose due to lack of an

// instantiation stack backtrace.  They may be due in part to the fact

// that it drops cv-qualification willy-nilly in templates.

#  define BOOST_NO_ONE_WAY_ITERATOR_INTEROP

# endif 

// no include guard; multiple inclusion intended