comparison DEPENDENCIES/generic/include/boost/spirit/home/karma/directive/buffer.hpp @ 16:2665513ce2d3

Add boost headers

+//  Copyright (c) 2001-2011 Hartmut Kaiser
+//
+//  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(SPIRIT_KARMA_BUFFER_AUG_03_2009_0949AM)
+#define SPIRIT_KARMA_BUFFER_AUG_03_2009_0949AM
+
+#if defined(_MSC_VER)
+#pragma once
+#endif
+
+#include <boost/spirit/home/karma/meta_compiler.hpp>
+#include <boost/spirit/home/karma/generator.hpp>
+#include <boost/spirit/home/karma/domain.hpp>
+#include <boost/spirit/home/karma/detail/output_iterator.hpp>
+#include <boost/spirit/home/support/unused.hpp>
+#include <boost/spirit/home/support/info.hpp>
+#include <boost/spirit/home/support/common_terminals.hpp>
+#include <boost/spirit/home/support/has_semantic_action.hpp>
+#include <boost/spirit/home/support/handles_container.hpp>
+#include <boost/spirit/home/karma/detail/attributes.hpp>
+
+namespace boost { namespace spirit
+{
+    ///////////////////////////////////////////////////////////////////////////
+    // Enablers
+    ///////////////////////////////////////////////////////////////////////////
+    template <>
+    struct use_directive<karma::domain, tag::buffer> // enables buffer
+      : mpl::true_ {};
+
+}}
+
+namespace boost { namespace spirit { namespace karma
+{
+#ifndef BOOST_SPIRIT_NO_PREDEFINED_TERMINALS
+    using spirit::buffer;
+#endif
+    using spirit::buffer_type;
+
+    ///////////////////////////////////////////////////////////////////////////
+    // buffer_directive buffers all generated output of the embedded generator
+    // and flushes it only if the whole embedded generator succeeds
+    ///////////////////////////////////////////////////////////////////////////
+    template <typename Subject>
+    struct buffer_directive : unary_generator<buffer_directive<Subject> >
+    {
+        typedef Subject subject_type;
+        typedef mpl::int_<
+            subject_type::properties::value | 
+            generator_properties::countingbuffer
+        > properties;
+
+        buffer_directive(Subject const& subject)
+          : subject(subject) {}
+
+        template <typename Context, typename Iterator>
+        struct attribute
+          : traits::attribute_of<subject_type, Context, Iterator>
+        {};
+
+        template <typename OutputIterator, typename Context, typename Delimiter
+          , typename Attribute>
+        bool generate(OutputIterator& sink, Context& ctx, Delimiter const& d
+          , Attribute const& attr) const
+        {
+            // wrap the given output iterator to avoid output as long as the
+            // embedded generator (subject) fails
+            detail::enable_buffering<OutputIterator> buffering(sink);
+            bool r = false;
+            {
+                detail::disable_counting<OutputIterator> nocounting(sink);
+                r = subject.generate(sink, ctx, d, attr);
+            }
+            if (r) 
+                buffering.buffer_copy();
+            return r;
+        }
+
+        template <typename Context>
+        info what(Context& context) const
+        {
+            return info("buffer", subject.what(context));
+        }
+
+        Subject subject;
+    };
+
+    ///////////////////////////////////////////////////////////////////////////
+    // Generator generators: make_xxx function (objects)
+    ///////////////////////////////////////////////////////////////////////////
+    template <typename Subject, typename Modifiers>
+    struct make_directive<tag::buffer, Subject, Modifiers>
+    {
+        typedef buffer_directive<Subject> result_type;
+        result_type operator()(unused_type, Subject const& subject
+          , unused_type) const
+        {
+            return result_type(subject);
+        }
+    };
+
+    // make sure buffer[buffer[...]] does not result in double buffering
+    template <typename Subject, typename Modifiers>
+    struct make_directive<tag::buffer, buffer_directive<Subject>, Modifiers>
+    {
+        typedef buffer_directive<Subject> result_type;
+        result_type operator()(unused_type
+          , buffer_directive<Subject> const& subject, unused_type) const
+        {
+            return subject;
+        }
+    };
+}}}
+
+namespace boost { namespace spirit { namespace traits
+{
+    ///////////////////////////////////////////////////////////////////////////
+    template <typename Subject>
+    struct has_semantic_action<karma::buffer_directive<Subject> >
+      : unary_has_semantic_action<Subject> {};
+
+    ///////////////////////////////////////////////////////////////////////////
+    template <typename Subject, typename Attribute, typename Context
+        , typename Iterator>
+    struct handles_container<karma::buffer_directive<Subject>, Attribute
+        , Context, Iterator>
+      : unary_handles_container<Subject, Attribute, Context, Iterator> {};
+}}}
+
+#endif