1 files changed, 155 insertions, 0 deletions
diff --git a/boost/spirit/home/x3/auxiliary/any_parser.hpp b/boost/spirit/home/x3/auxiliary/any_parser.hpp
new file mode 100644
index 0000000000..0e257c04b1
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+++ b/boost/spirit/home/x3/auxiliary/any_parser.hpp
@@ -0,0 +1,155 @@
+/*=============================================================================
+    Copyright (c) 2001-2014 Joel de Guzman
+    Copyright (c) 2013-2014 Agustin Berge
+
+    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_X3_AUXILIARY_ANY_PARSER_APR_09_2014_1145PM)
+#define BOOST_SPIRIT_X3_AUXILIARY_ANY_PARSER_APR_09_2014_1145PM
+
+#if defined(_MSC_VER)
+#pragma once
+#endif
+
+#include <boost/spirit/home/x3/core/parser.hpp>
+#include <boost/spirit/home/x3/support/context.hpp>
+#include <boost/spirit/home/x3/support/subcontext.hpp>
+#include <boost/spirit/home/x3/support/unused.hpp>
+#include <boost/spirit/home/x3/support/traits/container_traits.hpp>
+#include <boost/spirit/home/x3/support/traits/has_attribute.hpp>
+#include <boost/spirit/home/x3/support/traits/move_to.hpp>
+#include <boost/spirit/home/x3/support/traits/is_parser.hpp>
+#include <memory>
+#include <string>
+
+namespace boost { namespace spirit { namespace x3
+{
+    template <
+        typename Iterator
+      , typename Attribute = unused_type
+      , typename Context = subcontext<>>
+    struct any_parser : parser<any_parser<Iterator, Attribute, Context>>
+    {
+        typedef Attribute attribute_type;
+
+        static bool const has_attribute =
+            !is_same<unused_type, attribute_type>::value;
+        static bool const handles_container =
+            traits::is_container<Attribute>::value;
+
+    public:
+        any_parser()
+          : _content(nullptr) {}
+
+        template <typename Expr,
+            typename Enable = typename enable_if<traits::is_parser<Expr>>::type>
+        any_parser(Expr const& expr)
+          : _content(new holder<Expr>(expr)) {}
+
+        any_parser(any_parser const& other)
+          : _content(other._content ? other._content->clone() : nullptr) {}
+
+        any_parser(any_parser&& other) = default;
+
+        any_parser& operator=(any_parser const& other)
+        {
+            _content.reset(other._content ? other._content->clone() : nullptr);
+            return *this;
+        }
+
+        any_parser& operator=(any_parser&& other) = default;
+
+        template <typename Iterator_, typename Context_>
+        bool parse(Iterator_& first, Iterator_ const& last
+          , Context_ const& context, unused_type, Attribute& attr) const
+        {
+            BOOST_STATIC_ASSERT_MSG(
+                (is_same<Iterator, Iterator_>::value)
+              , "Incompatible iterator used"
+            );
+
+            BOOST_ASSERT_MSG(
+                (_content != nullptr)
+              , "Invalid use of uninitialized any_parser"
+            );
+
+            return _content->parse(first, last, context, attr);
+        }
+
+        template <typename Iterator_, typename Context_, typename Attribute_>
+        bool parse(Iterator_& first, Iterator_ const& last
+          , Context_ const& context, unused_type, Attribute_& attr_) const
+        {
+            Attribute attr;
+            if (parse(first, last, context, unused, attr))
+            {
+                traits::move_to(attr, attr_);
+                return true;
+            }
+            return false;
+        }
+
+        std::string get_info() const
+        {
+            return _content ? _content->get_info() : "";
+        }
+
+    private:
+
+        struct placeholder
+        {
+            virtual placeholder* clone() const = 0;
+
+            virtual bool parse(Iterator& first, Iterator const& last
+              , Context const& context, Attribute& attr) const = 0;
+
+            virtual std::string get_info() const = 0;
+
+            virtual ~placeholder() {}
+        };
+
+        template <typename Expr>
+        struct holder : placeholder
+        {
+            typedef typename extension::as_parser<Expr>::value_type parser_type;
+
+            explicit holder(Expr const& p)
+              : _parser(as_parser(p)) {}
+
+            holder* clone() const override
+            {
+                return new holder(*this);
+            }
+
+            bool parse(Iterator& first, Iterator const& last
+              , Context const& context, Attribute& attr) const override
+            {
+                return _parser.parse(first, last, context, unused, attr);
+            }
+
+            std::string get_info() const override
+            {
+                return x3::what(_parser);
+            }
+
+            parser_type _parser;
+        };
+
+    private:
+        std::unique_ptr<placeholder> _content;
+    };
+
+    template <typename Iterator, typename Attribute, typename Context>
+    struct get_info<any_parser<Iterator, Attribute, Context>>
+    {
+        typedef std::string result_type;
+        std::string operator()(
+            any_parser<Iterator, Attribute, Context> const& p) const
+        {
+            return p.get_info();
+        }
+    };
+}}}
+
+#endif