comparison DEPENDENCIES/generic/include/boost/spirit/home/qi/detail/assign_to.hpp @ 16:2665513ce2d3

Add boost headers

+/*=============================================================================
+    Copyright (c) 2001-2011 Joel de Guzman
+    Copyright (c) 2001-2011 Hartmut Kaiser
+    http://spirit.sourceforge.net/
+
+    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)
+=============================================================================*/
+#if !defined(BOOST_SPIRIT_ASSIGN_TO_APR_16_2006_0812PM)
+#define BOOST_SPIRIT_ASSIGN_TO_APR_16_2006_0812PM
+
+#if defined(_MSC_VER)
+#pragma once
+#endif
+
+#include <boost/spirit/home/qi/detail/construct.hpp>
+#include <boost/spirit/home/support/unused.hpp>
+#include <boost/spirit/home/qi/detail/attributes.hpp>
+#include <boost/spirit/home/support/container.hpp>
+#include <boost/fusion/include/copy.hpp>
+#include <boost/ref.hpp>
+#include <boost/range/iterator_range.hpp>
+
+namespace boost { namespace spirit { namespace traits
+{
+    ///////////////////////////////////////////////////////////////////////////
+    //  This file contains assignment utilities. The utilities provided also
+    //  accept spirit's unused_type; all no-ops. Compiler optimization will
+    //  easily strip these away.
+    ///////////////////////////////////////////////////////////////////////////
+    namespace detail
+    {
+        template <typename T>
+        struct is_iter_range : mpl::false_ {};
+
+        template <typename I>
+        struct is_iter_range<boost::iterator_range<I> > : mpl::true_ {};
+
+        template <typename C>
+        struct is_container_of_ranges
+          : is_iter_range<typename C::value_type> {};
+    }
+
+    template <typename Attribute, typename Iterator, typename Enable>
+    struct assign_to_attribute_from_iterators
+    {
+        // Common case
+        static void
+        call(Iterator const& first, Iterator const& last, Attribute& attr, mpl::false_)
+        {
+            if (traits::is_empty(attr))
+                attr = Attribute(first, last);
+            else {
+                for (Iterator i = first; i != last; ++i)
+                    push_back(attr, *i);
+            }
+        }
+
+        // If Attribute is a container with value_type==iterator_range<T> just push the
+        // iterator_range into it
+        static void
+        call(Iterator const& first, Iterator const& last, Attribute& attr, mpl::true_)
+        {
+            typename Attribute::value_type rng(first, last);
+            push_back(attr, rng);
+        }
+
+        static void
+        call(Iterator const& first, Iterator const& last, Attribute& attr)
+        {
+            call(first, last, attr, detail::is_container_of_ranges<Attribute>());
+        }
+    };
+
+    template <typename Attribute, typename Iterator>
+    struct assign_to_attribute_from_iterators<
+        reference_wrapper<Attribute>, Iterator>
+    {
+        static void
+        call(Iterator const& first, Iterator const& last
+          , reference_wrapper<Attribute> attr)
+        {
+            if (traits::is_empty(attr))
+                attr = Attribute(first, last);
+            else {
+                for (Iterator i = first; i != last; ++i)
+                    push_back(attr, *i);
+            }
+        }
+    };
+
+    template <typename Attribute, typename Iterator>
+    struct assign_to_attribute_from_iterators<
+        boost::optional<Attribute>, Iterator>
+    {
+        static void
+        call(Iterator const& first, Iterator const& last
+          , boost::optional<Attribute>& attr)
+        {
+            Attribute val;
+            assign_to(first, last, val);
+            attr = val;
+        }
+    };
+
+    template <typename Iterator>
+    struct assign_to_attribute_from_iterators<
+        iterator_range<Iterator>, Iterator>
+    {
+        static void
+        call(Iterator const& first, Iterator const& last
+          , iterator_range<Iterator>& attr)
+        {
+            attr = iterator_range<Iterator>(first, last);
+        }
+    };
+
+    template <typename Iterator, typename Attribute>
+    inline void
+    assign_to(Iterator const& first, Iterator const& last, Attribute& attr)
+    {
+        assign_to_attribute_from_iterators<Attribute, Iterator>::
+            call(first, last, attr);
+    }
+
+    template <typename Iterator>
+    inline void
+    assign_to(Iterator const&, Iterator const&, unused_type)
+    {
+    }
+
+    ///////////////////////////////////////////////////////////////////////////
+    template <typename T, typename Attribute>
+    void assign_to(T const& val, Attribute& attr);
+
+    template <typename Attribute, typename T, typename Enable>
+    struct assign_to_attribute_from_value
+    {
+        typedef typename traits::one_element_sequence<Attribute>::type
+            is_one_element_sequence;
+
+        typedef typename mpl::eval_if<
+            is_one_element_sequence
+          , fusion::result_of::at_c<Attribute, 0>
+          , mpl::identity<Attribute&>
+        >::type type;
+
+        template <typename T_>
+        static void
+        call(T_ const& val, Attribute& attr, mpl::false_)
+        {
+            attr = static_cast<Attribute>(val);
+        }
+
+        // This handles the case where the attribute is a single element fusion
+        // sequence. We silently assign to the only element and treat it as the
+        // attribute to parse the results into.
+        template <typename T_>
+        static void
+        call(T_ const& val, Attribute& attr, mpl::true_)
+        {
+            typedef typename fusion::result_of::value_at_c<Attribute, 0>::type
+                element_type;
+            fusion::at_c<0>(attr) = static_cast<element_type>(val);
+        }
+
+        static void
+        call(T const& val, Attribute& attr)
+        {
+            call(val, attr, is_one_element_sequence());
+        }
+    };
+
+    template <typename Attribute>
+    struct assign_to_attribute_from_value<Attribute, Attribute>
+    {
+        static void
+        call(Attribute const& val, Attribute& attr)
+        {
+            attr = val;
+        }
+    };
+
+    template <typename Attribute, typename T>
+    struct assign_to_attribute_from_value<Attribute, reference_wrapper<T>
+      , typename disable_if<is_same<Attribute, reference_wrapper<T> > >::type>
+    {
+        static void
+        call(reference_wrapper<T> const& val, Attribute& attr)
+        {
+            assign_to(val.get(), attr);
+        }
+    };
+
+    template <typename Attribute, typename T>
+    struct assign_to_attribute_from_value<Attribute, boost::optional<T>
+      , typename disable_if<is_same<Attribute, boost::optional<T> > >::type>
+    {
+        static void
+        call(boost::optional<T> const& val, Attribute& attr)
+        {
+            assign_to(val.get(), attr);
+        }
+    };
+
+    namespace detail
+    {
+        template <typename A, typename B>
+        struct is_same_size_sequence
+          : mpl::bool_<fusion::result_of::size<A>::value
+                == fusion::result_of::size<B>::value>
+        {};
+    }
+
+    template <typename Attribute, typename T>
+    struct assign_to_attribute_from_value<Attribute, T,
+            mpl::and_<
+                fusion::traits::is_sequence<Attribute>,
+                fusion::traits::is_sequence<T>,
+                detail::is_same_size_sequence<Attribute, T>
+            >
+        >
+    {
+        static void
+        call(T const& val, Attribute& attr)
+        {
+            fusion::copy(val, attr);
+        }
+    };
+
+    ///////////////////////////////////////////////////////////////////////////
+    template <typename Attribute, typename T, typename Enable>
+    struct assign_to_container_from_value
+    {
+        // T is not a container and not a string
+        template <typename T_>
+        static void call(T_ const& val, Attribute& attr, mpl::false_, mpl::false_)
+        {
+            traits::push_back(attr, val);
+        }
+
+        // T is a container (but not a string), and T is convertible to the 
+        // value_type of the Attribute container
+        template <typename T_>
+        static void 
+        append_to_container_not_string(T_ const& val, Attribute& attr, mpl::true_)
+        {
+            traits::push_back(attr, val);
+        }
+
+        // T is a container (but not a string), generic overload
+        template <typename T_>
+        static void 
+        append_to_container_not_string(T_ const& val, Attribute& attr, mpl::false_)
+        {
+            typedef typename traits::container_iterator<T_ const>::type
+                iterator_type;
+
+            iterator_type end = traits::end(val);
+            for (iterator_type i = traits::begin(val); i != end; traits::next(i))
+                traits::push_back(attr, traits::deref(i));
+        }
+
+        // T is a container (but not a string)
+        template <typename T_>
+        static void call(T_ const& val, Attribute& attr,  mpl::true_, mpl::false_)
+        {
+            typedef typename container_value<Attribute>::type value_type;
+            typedef typename is_convertible<T, value_type>::type is_value_type;
+
+            append_to_container_not_string(val, attr, is_value_type());
+        }
+
+        ///////////////////////////////////////////////////////////////////////
+        // T is a string
+        template <typename Iterator>
+        static void append_to_string(Attribute& attr, Iterator begin, Iterator end)
+        {
+            for (Iterator i = begin; i != end; ++i)
+                traits::push_back(attr, *i);
+        }
+
+        // T is string, but not convertible to value_type of container
+        template <typename T_>
+        static void append_to_container(T_ const& val, Attribute& attr, mpl::false_)
+        {
+            typedef typename char_type_of<T_>::type char_type;
+
+            append_to_string(attr, traits::get_begin<char_type>(val)
+              , traits::get_end<char_type>(val));
+        }
+
+        // T is string, and convertible to value_type of container
+        template <typename T_>
+        static void append_to_container(T_ const& val, Attribute& attr, mpl::true_)
+        {
+            traits::push_back(attr, val);
+        }
+
+        template <typename T_, typename Pred>
+        static void call(T_ const& val, Attribute& attr, Pred, mpl::true_)
+        {
+            typedef typename container_value<Attribute>::type value_type;
+            typedef typename is_convertible<T, value_type>::type is_value_type;
+
+            append_to_container(val, attr, is_value_type());
+        }
+
+        ///////////////////////////////////////////////////////////////////////
+        static void call(T const& val, Attribute& attr)
+        {
+            typedef typename traits::is_container<T>::type is_container;
+            typedef typename traits::is_string<T>::type is_string;
+
+            call(val, attr, is_container(), is_string());
+        }
+    };
+
+    template <typename Attribute>
+    struct assign_to_container_from_value<Attribute, Attribute>
+    {
+        static void
+        call(Attribute const& val, Attribute& attr)
+        {
+            attr = val;
+        }
+    };
+
+    template <typename Attribute, typename T>
+    struct assign_to_container_from_value<Attribute, boost::optional<T>
+      , typename disable_if<is_same<Attribute, boost::optional<T> > >::type>
+    {
+        static void
+        call(boost::optional<T> const& val, Attribute& attr)
+        {
+            assign_to(val.get(), attr);
+        }
+    };
+
+    template <typename Attribute, typename T>
+    struct assign_to_container_from_value<Attribute, reference_wrapper<T>
+      , typename disable_if<is_same<Attribute, reference_wrapper<T> > >::type>
+    {
+        static void
+        call(reference_wrapper<T> const& val, Attribute& attr)
+        {
+            assign_to(val.get(), attr);
+        }
+    };
+
+    ///////////////////////////////////////////////////////////////////////////
+    namespace detail
+    {
+        // overload for non-container attributes
+        template <typename T, typename Attribute>
+        inline void
+        assign_to(T const& val, Attribute& attr, mpl::false_)
+        {
+            assign_to_attribute_from_value<Attribute, T>::call(val, attr);
+        }
+
+        // overload for containers (but not for variants or optionals
+        // holding containers)
+        template <typename T, typename Attribute>
+        inline void
+        assign_to(T const& val, Attribute& attr, mpl::true_)
+        {
+            assign_to_container_from_value<Attribute, T>::call(val, attr);
+        }
+    }
+
+    template <typename T, typename Attribute>
+    inline void
+    assign_to(T const& val, Attribute& attr)
+    {
+        typedef typename mpl::and_<
+            traits::is_container<Attribute>
+          , traits::not_is_variant<Attribute>
+          , traits::not_is_optional<Attribute>
+        >::type is_not_wrapped_container;
+
+        detail::assign_to(val, attr, is_not_wrapped_container());
+    }
+
+    template <typename T>
+    inline void
+    assign_to(T const&, unused_type)
+    {
+    }
+}}}
+
+#endif