Subject: [Boost-commit] svn:boost r85769 - in trunk/boost/spirit/home/x3: . support
From: kaballo86_at_[hidden]
Date: 2013-09-17 21:32:03
Author: aberge
Date: 2013-09-17 21:32:03 EDT (Tue, 17 Sep 2013)
New Revision: 85769
URL: http://svn.boost.org/trac/boost/changeset/85769
Log:
Spirit X3 unused
Added:
trunk/boost/spirit/home/x3/
trunk/boost/spirit/home/x3/support/
trunk/boost/spirit/home/x3/support/unused.hpp (contents, props changed)
Added: trunk/boost/spirit/home/x3/support/unused.hpp
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ trunk/boost/spirit/home/x3/support/unused.hpp 2013-09-17 21:32:03 EDT (Tue, 17 Sep 2013) (r85769)
@@ -0,0 +1,93 @@
+/*=============================================================================
+ Copyright (c) 2001-2013 Joel de Guzman
+ 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(BOOST_SPIRIT_X3_UNUSED_APRIL_16_2006_0616PM)
+#define BOOST_SPIRIT_X3_UNUSED_APRIL_16_2006_0616PM
+
+#if defined(_MSC_VER)
+#pragma once
+#endif
+
+#include <ostream>
+#include <istream>
+#include <boost/mpl/identity.hpp>
+
+#if defined(BOOST_MSVC)
+# pragma warning(push)
+# pragma warning(disable: 4522) // multiple assignment operators specified warning
+#endif
+
+///////////////////////////////////////////////////////////////////////////////
+namespace boost { namespace spirit { namespace x3
+{
+ struct unused_type
+ {
+ unused_type()
+ {
+ }
+
+ template <typename T>
+ unused_type(T const&)
+ {
+ }
+
+ template <typename T>
+ unused_type const&
+ operator=(T const&) const
+ {
+ return *this;
+ }
+
+ template <typename T>
+ unused_type&
+ operator=(T const&)
+ {
+ return *this;
+ }
+
+ unused_type const&
+ operator=(unused_type const&) const
+ {
+ return *this;
+ }
+
+ unused_type&
+ operator=(unused_type const&)
+ {
+ return *this;
+ }
+
+ // unused_type can also masquerade as an empty context (see context.hpp)
+
+ template <typename ID>
+ struct get_result : mpl::identity<unused_type> {};
+
+ template <typename ID>
+ unused_type get(ID) const
+ {
+ return unused_type();
+ }
+ };
+
+ unused_type const unused = unused_type();
+
+ inline std::ostream& operator<<(std::ostream& out, unused_type const&)
+ {
+ return out;
+ }
+
+ inline std::istream& operator>>(std::istream& in, unused_type&)
+ {
+ return in;
+ }
+}}}
+
+#if defined(BOOST_MSVC)
+# pragma warning(pop)
+#endif
+
+#endif