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Diffstat (limited to '3rdParty/Boost/src/boost/asio/detail/buffer_resize_guard.hpp')
-rw-r--r--3rdParty/Boost/src/boost/asio/detail/buffer_resize_guard.hpp72
1 files changed, 72 insertions, 0 deletions
diff --git a/3rdParty/Boost/src/boost/asio/detail/buffer_resize_guard.hpp b/3rdParty/Boost/src/boost/asio/detail/buffer_resize_guard.hpp
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+++ b/3rdParty/Boost/src/boost/asio/detail/buffer_resize_guard.hpp
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+//
+// buffer_resize_guard.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2008 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// 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_ASIO_DETAIL_BUFFER_RESIZE_GUARD_HPP
+#define BOOST_ASIO_DETAIL_BUFFER_RESIZE_GUARD_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include <boost/asio/detail/push_options.hpp>
+
+#include <boost/asio/detail/push_options.hpp>
+#include <limits>
+#include <boost/config.hpp>
+#include <boost/asio/detail/pop_options.hpp>
+
+namespace boost {
+namespace asio {
+namespace detail {
+
+// Helper class to manage buffer resizing in an exception safe way.
+template <typename Buffer>
+class buffer_resize_guard
+{
+public:
+ // Constructor.
+ buffer_resize_guard(Buffer& buffer)
+ : buffer_(buffer),
+ old_size_(buffer.size())
+ {
+ }
+
+ // Destructor rolls back the buffer resize unless commit was called.
+ ~buffer_resize_guard()
+ {
+ if (old_size_
+ != std::numeric_limits<size_t>::max BOOST_PREVENT_MACRO_SUBSTITUTION())
+ {
+ buffer_.resize(old_size_);
+ }
+ }
+
+ // Commit the resize transaction.
+ void commit()
+ {
+ old_size_
+ = std::numeric_limits<size_t>::max BOOST_PREVENT_MACRO_SUBSTITUTION();
+ }
+
+private:
+ // The buffer being managed.
+ Buffer& buffer_;
+
+ // The size of the buffer at the time the guard was constructed.
+ size_t old_size_;
+};
+
+} // namespace detail
+} // namespace asio
+} // namespace boost
+
+#include <boost/asio/detail/pop_options.hpp>
+
+#endif // BOOST_ASIO_DETAIL_BUFFER_RESIZE_GUARD_HPP