Added boost header

test/external/boost/iterator/transform_iterator.hpp

@@ -0,0 +1,172 @@
+// (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)
+#ifndef BOOST_TRANSFORM_ITERATOR_23022003THW_HPP
+#define BOOST_TRANSFORM_ITERATOR_23022003THW_HPP
+
+#include <boost/iterator.hpp>
+#include <boost/iterator/detail/enable_if.hpp>
+#include <boost/iterator/iterator_adaptor.hpp>
+#include <boost/iterator/iterator_categories.hpp>
+#include <boost/mpl/not.hpp>
+#include <boost/mpl/bool.hpp>
+#include <boost/type_traits/function_traits.hpp>
+#include <boost/type_traits/is_const.hpp>
+#include <boost/type_traits/is_class.hpp>
+#include <boost/type_traits/is_function.hpp>
+#include <boost/type_traits/is_reference.hpp>
+#include <boost/type_traits/remove_const.hpp>
+#include <boost/type_traits/remove_reference.hpp>
+#include <boost/utility/result_of.hpp>
+
+
+#if BOOST_WORKAROUND(BOOST_MSVC, BOOST_TESTED_AT(1310))
+# include <boost/type_traits/is_base_and_derived.hpp>
+
+#endif 
+#include <boost/iterator/detail/config_def.hpp>
+
+
+namespace boost
+{
+  template <class UnaryFunction, class Iterator, class Reference = use_default, class Value = use_default>
+  class transform_iterator;
+
+  namespace detail 
+  {
+    // Compute the iterator_adaptor instantiation to be used for transform_iterator
+    template <class UnaryFunc, class Iterator, class Reference, class Value>
+    struct transform_iterator_base
+    {
+     private:
+        // By default, dereferencing the iterator yields the same as
+        // the function.
+        typedef typename ia_dflt_help<
+            Reference
+          , result_of<UnaryFunc(typename std::iterator_traits<Iterator>::reference)>
+        >::type reference;
+
+        // To get the default for Value: remove any reference on the
+        // result type, but retain any constness to signal
+        // non-writability.  Note that if we adopt Thomas' suggestion
+        // to key non-writability *only* on the Reference argument,
+        // we'd need to strip constness here as well.
+        typedef typename ia_dflt_help<
+            Value
+          , remove_reference<reference>
+        >::type cv_value_type;
+
+     public:
+        typedef iterator_adaptor<
+            transform_iterator<UnaryFunc, Iterator, Reference, Value>
+          , Iterator
+          , cv_value_type
+          , use_default    // Leave the traversal category alone
+          , reference
+        > type;
+    };
+  }
+
+  template <class UnaryFunc, class Iterator, class Reference, class Value>
+  class transform_iterator
+    : public boost::detail::transform_iterator_base<UnaryFunc, Iterator, Reference, Value>::type
+  {
+    typedef typename
+    boost::detail::transform_iterator_base<UnaryFunc, Iterator, Reference, Value>::type
+    super_t;
+
+    friend class iterator_core_access;
+
+  public:
+    transform_iterator() { }
+
+    transform_iterator(Iterator const& x, UnaryFunc f)
+      : super_t(x), m_f(f) { }
+
+    explicit transform_iterator(Iterator const& x)
+      : super_t(x)
+    {
+        // Pro8 is a little too aggressive about instantiating the
+        // body of this function.
+#if !BOOST_WORKAROUND(__MWERKS__, BOOST_TESTED_AT(0x3003))
+        // don't provide this constructor if UnaryFunc is a
+        // function pointer type, since it will be 0.  Too dangerous.
+        BOOST_STATIC_ASSERT(is_class<UnaryFunc>::value);
+#endif 
+    }
+
+    template <
+        class OtherUnaryFunction
+      , class OtherIterator
+      , class OtherReference
+      , class OtherValue>
+    transform_iterator(
+         transform_iterator<OtherUnaryFunction, OtherIterator, OtherReference, OtherValue> const& t
+       , typename enable_if_convertible<OtherIterator, Iterator>::type* = 0
+#if !BOOST_WORKAROUND(BOOST_MSVC, == 1310)
+       , typename enable_if_convertible<OtherUnaryFunction, UnaryFunc>::type* = 0
+#endif 
+    )
+      : super_t(t.base()), m_f(t.functor())
+   {}
+
+    UnaryFunc functor() const
+      { return m_f; }
+
+  private:
+    typename super_t::reference dereference() const
+    { return m_f(*this->base()); }
+
+    // Probably should be the initial base class so it can be
+    // optimized away via EBO if it is an empty class.
+    UnaryFunc m_f;
+  };
+
+  template <class UnaryFunc, class Iterator>
+  transform_iterator<UnaryFunc, Iterator>
+  make_transform_iterator(Iterator it, UnaryFunc fun)
+  {
+      return transform_iterator<UnaryFunc, Iterator>(it, fun);
+  }
+
+  // Version which allows explicit specification of the UnaryFunc
+  // type.
+  //
+  // This generator is not provided if UnaryFunc is a function
+  // pointer type, because it's too dangerous: the default-constructed
+  // function pointer in the iterator be 0, leading to a runtime
+  // crash.
+  template <class UnaryFunc, class Iterator>
+#if BOOST_WORKAROUND(BOOST_MSVC, <= 1300)
+  typename mpl::if_<
+#else 
+  typename iterators::enable_if<
+#endif 
+      is_class<UnaryFunc>   // We should probably find a cheaper test than is_class<>
+    , transform_iterator<UnaryFunc, Iterator>
+#if BOOST_WORKAROUND(BOOST_MSVC, <= 1300)
+    , int[3]
+#endif 
+  >::type
+  make_transform_iterator(Iterator it)
+  {
+      return transform_iterator<UnaryFunc, Iterator>(it, UnaryFunc());
+  }
+
+#if defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION ) && !defined(BOOST_NO_FUNCTION_TEMPLATE_ORDERING)
+  template <class Return, class Argument, class Iterator>
+  transform_iterator< Return (*)(Argument), Iterator, Return>
+  make_transform_iterator(Iterator it, Return (*fun)(Argument))
+  {
+    return transform_iterator<Return (*)(Argument), Iterator, Return>(it, fun);
+  }
+#endif
+
+} // namespace boost
+
+#include <boost/iterator/detail/config_undef.hpp>
+
+#endif // BOOST_TRANSFORM_ITERATOR_23022003THW_HPP