--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/ossrv_pub/boost_apis/boost/iostreams/chain.hpp Tue Feb 02 02:01:42 2010 +0200
@@ -0,0 +1,563 @@
+// (C) Copyright Jonathan Turkanis 2003.
+// 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.)
+
+// See http://www.boost.org/libs/iostreams for documentation.
+
+#ifndef BOOST_IOSTREAMS_DETAIL_CHAIN_HPP_INCLUDED
+#define BOOST_IOSTREAMS_DETAIL_CHAIN_HPP_INCLUDED
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+# pragma once
+#endif
+
+#include <algorithm> // for_each.
+#include <cassert>
+#include <exception>
+#include <functional> // unary_function.
+#include <iterator> // advance.
+#include <list>
+#include <memory> // allocator, auto_ptr.
+#include <typeinfo>
+#include <stdexcept> // logic_error, out_of_range.
+#include <boost/checked_delete.hpp>
+#include <boost/config.hpp> // BOOST_MSVC, template friends,
+#include <boost/detail/workaround.hpp> // BOOST_NESTED_TEMPLATE
+#include <boost/iostreams/constants.hpp>
+#include <boost/iostreams/detail/access_control.hpp>
+#include <boost/iostreams/detail/char_traits.hpp>
+#include <boost/iostreams/detail/push.hpp>
+#include <boost/iostreams/detail/streambuf.hpp> // pubsync.
+#include <boost/iostreams/detail/wrap_unwrap.hpp>
+#include <boost/iostreams/device/null.hpp>
+#include <boost/iostreams/positioning.hpp>
+#include <boost/iostreams/traits.hpp> // is_filter.
+#include <boost/iostreams/stream_buffer.hpp>
+#include <boost/next_prior.hpp>
+#include <boost/shared_ptr.hpp>
+#include <boost/static_assert.hpp>
+#include <boost/type_traits/is_convertible.hpp>
+#include <boost/type.hpp>
+#if BOOST_WORKAROUND(BOOST_MSVC, < 1310)
+# include <boost/mpl/int.hpp>
+#endif
+
+// Sometimes type_info objects must be compared by name. Borrowed from
+// Boost.Python and Boost.Function.
+#if (defined(__GNUC__) && __GNUC__ >= 3) || \
+ defined(_AIX) || \
+ (defined(__sgi) && defined(__host_mips)) || \
+ (defined(linux) && defined(__INTEL_COMPILER) && defined(__ICC)) \
+ /**/
+# include <cstring>
+# define BOOST_IOSTREAMS_COMPARE_TYPE_ID(X,Y) \
+ (std::strcmp((X).name(),(Y).name()) == 0)
+#else
+# define BOOST_IOSTREAMS_COMPARE_TYPE_ID(X,Y) ((X)==(Y))
+#endif
+
+// Deprecated
+#define BOOST_IOSTREAMS_COMPONENT_TYPE(chain, index) \
+ chain.component_type( index ) \
+ /**/
+
+#if !BOOST_WORKAROUND(BOOST_MSVC, < 1310)
+# define BOOST_IOSTREAMS_COMPONENT(chain, index, target) \
+ chain.component< target >( index ) \
+ /**/
+#else
+# define BOOST_IOSTREAMS_COMPONENT(chain, index, target) \
+ chain.component( index, ::boost::type< target >() ) \
+ /**/
+#endif
+
+namespace boost { namespace iostreams {
+
+//--------------Definition of chain and wchain--------------------------------//
+
+namespace detail {
+
+template<typename Chain> class chain_client;
+
+//
+// Concept name: Chain.
+// Description: Represents a chain of stream buffers which provides access
+// to the first buffer in the chain and send notifications when the
+// streambufs are added to or removed from chain.
+// Refines: Closable device with mode equal to typename Chain::mode.
+// Models: chain, converting_chain.
+// Example:
+//
+// class chain {
+// public:
+// typedef xxx chain_type;
+// typedef xxx client_type;
+// typedef xxx mode;
+// bool is_complete() const; // Ready for i/o.
+// template<typename T>
+// void push( const T& t, // Adds a stream buffer to
+// streamsize, // chain, based on t, with
+// streamsize ); // given buffer and putback
+// // buffer sizes. Pass -1 to
+// // request default size.
+// protected:
+// void register_client(client_type* client); // Associate client.
+// void notify(); // Notify client.
+// };
+//
+
+//
+// Description: Represents a chain of filters with an optional device at the
+// end.
+// Template parameters:
+// Self - A class deriving from the current instantiation of this template.
+// This is an example of the Curiously Recurring Template Pattern.
+// Ch - The character type.
+// Tr - The character traits type.
+// Alloc - The allocator type.
+// Mode - A mode tag.
+//
+template<typename Self, typename Ch, typename Tr, typename Alloc, typename Mode>
+class chain_base {
+public:
+ typedef Ch char_type;
+ BOOST_IOSTREAMS_STREAMBUF_TYPEDEFS(Tr)
+ typedef Alloc allocator_type;
+ typedef Mode mode;
+ struct category
+ : Mode,
+ device_tag
+ { };
+ typedef chain_client<Self> client_type;
+ friend class chain_client<Self>;
+private:
+ typedef linked_streambuf<Ch> streambuf_type;
+ typedef std::list<streambuf_type*> list_type;
+ typedef chain_base<Self, Ch, Tr, Alloc, Mode> my_type;
+protected:
+ chain_base() : pimpl_(new chain_impl) { }
+ chain_base(const chain_base& rhs): pimpl_(rhs.pimpl_) { }
+public:
+
+ //----------Buffer sizing-------------------------------------------------//
+
+ // Sets the size of the buffer created for the devices to be added to this
+ // chain. Does not affect the size of the buffer for devices already
+ // added.
+ void set_device_buffer_size(int n) { pimpl_->device_buffer_size_ = n; }
+
+ // Sets the size of the buffer created for the filters to be added
+ // to this chain. Does not affect the size of the buffer for filters already
+ // added.
+ void set_filter_buffer_size(int n) { pimpl_->filter_buffer_size_ = n; }
+
+ // Sets the size of the putback buffer for filters and devices to be added
+ // to this chain. Does not affect the size of the buffer for filters or
+ // devices already added.
+ void set_pback_size(int n) { pimpl_->pback_size_ = n; }
+
+ //----------Device interface----------------------------------------------//
+
+ std::streamsize read(char_type* s, std::streamsize n);
+ std::streamsize write(const char_type* s, std::streamsize n);
+ std::streampos seek(stream_offset off, BOOST_IOS::seekdir way);
+
+ //----------Direct component access---------------------------------------//
+
+ const std::type_info& component_type(int n) const
+ {
+ if (static_cast<size_type>(n) >= size())
+ throw std::out_of_range("bad chain offset");
+ return (*boost::next(list().begin(), n))->component_type();
+ }
+
+#if !BOOST_WORKAROUND(BOOST_MSVC, < 1310)
+ // Deprecated.
+ template<int N>
+ const std::type_info& component_type() const { return component_type(N); }
+
+ template<typename T>
+ T* component(int n) const { return component(n, boost::type<T>()); }
+
+ // Deprecated.
+ template<int N, typename T>
+ T* component() const { return component<T>(N); }
+#endif
+
+#if !BOOST_WORKAROUND(BOOST_MSVC, < 1310)
+ private:
+#endif
+ template<typename T>
+ T* component(int n, boost::type<T>) const
+ {
+ if (static_cast<size_type>(n) >= size())
+ throw std::out_of_range("bad chain offset");
+ streambuf_type* link = *boost::next(list().begin(), n);
+ if (BOOST_IOSTREAMS_COMPARE_TYPE_ID(link->component_type(), typeid(T)))
+ return static_cast<T*>(link->component_impl());
+ else
+ return 0;
+ }
+public:
+
+ //----------Container-like interface--------------------------------------//
+
+ typedef typename list_type::size_type size_type;
+ streambuf_type& front() { return *list().front(); }
+ BOOST_IOSTREAMS_DEFINE_PUSH(push, mode, char_type, push_impl)
+ void pop();
+ bool empty() const { return list().empty(); }
+ size_type size() const { return list().size(); }
+ void reset();
+
+ //----------Additional i/o functions--------------------------------------//
+
+ // Returns true if this chain is non-empty and its final link
+ // is a source or sink, i.e., if it is ready to perform i/o.
+ bool is_complete() const;
+ bool auto_close() const;
+ void set_auto_close(bool close);
+ bool sync() { return front().BOOST_IOSTREAMS_PUBSYNC() != -1; }
+ bool strict_sync();
+private:
+ template<typename T>
+ void push_impl(const T& t, int buffer_size = -1, int pback_size = -1)
+ {
+ typedef typename iostreams::category_of<T>::type category;
+ typedef typename unwrap_ios<T>::type policy_type;
+ typedef stream_buffer<
+ policy_type,
+ BOOST_IOSTREAMS_CHAR_TRAITS(char_type),
+ Alloc, Mode
+ > facade_type;
+ BOOST_STATIC_ASSERT((is_convertible<category, Mode>::value));
+ if (is_complete())
+ throw std::logic_error("chain complete");
+ streambuf_type* prev = !empty() ? list().back() : 0;
+ buffer_size =
+ buffer_size != -1 ?
+ buffer_size :
+ iostreams::optimal_buffer_size(t);
+ pback_size =
+ pback_size != -1 ?
+ pback_size :
+ pimpl_->pback_size_;
+ std::auto_ptr<facade_type>
+ buf(new facade_type(t, buffer_size, pback_size));
+ list().push_back(buf.get());
+ buf.release();
+ if (is_device<policy_type>::value)
+ pimpl_->flags_ |= f_complete | f_open;
+ if (prev) prev->set_next(list().back());
+ notify();
+ }
+
+ list_type& list() { return pimpl_->links_; }
+ const list_type& list() const { return pimpl_->links_; }
+ void register_client(client_type* client) { pimpl_->client_ = client; }
+ void notify() { if (pimpl_->client_) pimpl_->client_->notify(); }
+
+ //----------Nested classes------------------------------------------------//
+
+ static void close(streambuf_type* b, BOOST_IOS::openmode m)
+ {
+ if (m & BOOST_IOS::out)
+ b->BOOST_IOSTREAMS_PUBSYNC();
+ b->close(m);
+ }
+
+ static void set_next(streambuf_type* b, streambuf_type* next)
+ { b->set_next(next); }
+
+ static void set_auto_close(streambuf_type* b, bool close)
+ { b->set_auto_close(close); }
+
+ struct closer : public std::unary_function<streambuf_type*, void> {
+ closer(BOOST_IOS::openmode m) : mode_(m) { }
+ void operator() (streambuf_type* b)
+ {
+ close(b, mode_);
+ }
+ BOOST_IOS::openmode mode_;
+ };
+ friend struct closer;
+
+ enum flags {
+ f_complete = 1,
+ f_open = 2,
+ f_auto_close = 4
+ };
+
+ struct chain_impl {
+ chain_impl()
+ : client_(0), device_buffer_size_(default_device_buffer_size),
+ filter_buffer_size_(default_filter_buffer_size),
+ pback_size_(default_pback_buffer_size),
+ flags_(f_auto_close)
+ { }
+ ~chain_impl() { try { close(); reset(); } catch (std::exception&) { } }
+ void close()
+ {
+ if ((flags_ & f_open) != 0) {
+ stream_buffer< basic_null_device<Ch, Mode> > null;
+ if ((flags_ & f_complete) == 0) {
+ null.open(basic_null_device<Ch, Mode>());
+ set_next(links_.back(), &null);
+ }
+ links_.front()->BOOST_IOSTREAMS_PUBSYNC();
+ if (is_convertible<Mode, input>::value)
+ std::for_each( links_.rbegin(), links_.rend(),
+ closer(BOOST_IOS::in) );
+ if (is_convertible<Mode, output>::value)
+ std::for_each( links_.begin(), links_.end(),
+ closer(BOOST_IOS::out) );
+ flags_ &= ~f_open;
+ }
+ }
+ void reset()
+ {
+ typedef typename list_type::iterator iterator;
+ for ( iterator first = links_.begin(),
+ last = links_.end();
+ first != last;
+ ++first )
+ {
+ if ( (flags_ & f_complete) == 0 ||
+ (flags_ & f_auto_close) == 0 )
+ {
+ set_auto_close(*first, false);
+ }
+ streambuf_type* buf = 0;
+ std::swap(buf, *first);
+ delete buf;
+ }
+ links_.clear();
+ flags_ &= ~f_complete;
+ flags_ &= ~f_open;
+ }
+ list_type links_;
+ client_type* client_;
+ int device_buffer_size_,
+ filter_buffer_size_,
+ pback_size_;
+ int flags_;
+ };
+ friend struct chain_impl;
+
+ //----------Member data---------------------------------------------------//
+
+private:
+ shared_ptr<chain_impl> pimpl_;
+};
+
+} // End namespace detail.
+
+//
+// Macro: BOOST_IOSTREAMS_DECL_CHAIN(name, category)
+// Description: Defines a template derived from chain_base appropriate for a
+// particular i/o category. The template has the following parameters:
+// Ch - The character type.
+// Tr - The character traits type.
+// Alloc - The allocator type.
+// Macro parameters:
+// name_ - The name of the template to be defined.
+// category_ - The i/o category of the template to be defined.
+//
+#define BOOST_IOSTREAMS_DECL_CHAIN(name_, default_char_) \
+ template< typename Mode, typename Ch = default_char_, \
+ typename Tr = BOOST_IOSTREAMS_CHAR_TRAITS(Ch), \
+ typename Alloc = std::allocator<Ch> > \
+ class name_ : public boost::iostreams::detail::chain_base< \
+ name_<Mode, Ch, Tr, Alloc>, \
+ Ch, Tr, Alloc, Mode \
+ > \
+ { \
+ public: \
+ struct category : device_tag, Mode { }; \
+ typedef Mode mode; \
+ private: \
+ typedef boost::iostreams::detail::chain_base< \
+ name_<Mode, Ch, Tr, Alloc>, \
+ Ch, Tr, Alloc, Mode \
+ > base_type; \
+ public: \
+ typedef Ch char_type; \
+ typedef Tr traits_type; \
+ typedef typename traits_type::int_type int_type; \
+ typedef typename traits_type::off_type off_type; \
+ name_() { } \
+ name_(const name_& rhs) { *this = rhs; } \
+ name_& operator=(const name_& rhs) \
+ { base_type::operator=(rhs); return *this; } \
+ }; \
+ /**/
+BOOST_IOSTREAMS_DECL_CHAIN(chain, char)
+BOOST_IOSTREAMS_DECL_CHAIN(wchain, wchar_t)
+#undef BOOST_IOSTREAMS_DECL_CHAIN
+
+//--------------Definition of chain_client------------------------------------//
+
+namespace detail {
+
+//
+// Template name: chain_client
+// Description: Class whose instances provide access to an underlying chain
+// using an interface similar to the chains.
+// Subclasses: the various stream and stream buffer templates.
+//
+template<typename Chain>
+class chain_client {
+public:
+ typedef Chain chain_type;
+ typedef typename chain_type::char_type char_type;
+ typedef typename chain_type::traits_type traits_type;
+ typedef typename chain_type::size_type size_type;
+ typedef typename chain_type::mode mode;
+
+ chain_client(chain_type* chn = 0) : chain_(chn ) { }
+ chain_client(chain_client* client) : chain_(client->chain_) { }
+ virtual ~chain_client() { }
+
+ const std::type_info& component_type(int n) const
+ { return chain_->component_type(n); }
+
+#if !BOOST_WORKAROUND(BOOST_MSVC, < 1310)
+ // Deprecated.
+ template<int N>
+ const std::type_info& component_type() const
+ { return chain_->BOOST_NESTED_TEMPLATE component_type<N>(); }
+
+ template<typename T>
+ T* component(int n) const
+ { return chain_->BOOST_NESTED_TEMPLATE component<T>(n); }
+
+ // Deprecated.
+ template<int N, typename T>
+ T* component() const
+ { return chain_->BOOST_NESTED_TEMPLATE component<N, T>(); }
+#else
+ template<typename T>
+ T* component(int n, boost::type<T> t) const
+ { return chain_->component(n, t); }
+#endif
+
+ bool is_complete() const { return chain_->is_complete(); }
+ bool auto_close() const { return chain_->auto_close(); }
+ void set_auto_close(bool close) { chain_->set_auto_close(close); }
+ bool strict_sync() { return chain_->strict_sync(); }
+ void set_device_buffer_size(std::streamsize n)
+ { chain_->set_device_buffer_size(n); }
+ void set_filter_buffer_size(std::streamsize n)
+ { chain_->set_filter_buffer_size(n); }
+ void set_pback_size(std::streamsize n) { chain_->set_pback_size(n); }
+ BOOST_IOSTREAMS_DEFINE_PUSH(push, mode, char_type, push_impl)
+ void pop() { chain_->pop(); }
+ bool empty() const { return chain_->empty(); }
+ size_type size() { return chain_->size(); }
+ void reset() { chain_->reset(); }
+
+ // Returns a copy of the underlying chain.
+ chain_type filters() { return *chain_; }
+ chain_type filters() const { return *chain_; }
+protected:
+ template<typename T>
+ void push_impl(const T& t BOOST_IOSTREAMS_PUSH_PARAMS())
+ { chain_->push(t BOOST_IOSTREAMS_PUSH_ARGS()); }
+ chain_type& ref() { return *chain_; }
+ void set_chain(chain_type* c)
+ { chain_ = c; chain_->register_client(this); }
+#if !defined(BOOST_NO_MEMBER_TEMPLATE_FRIENDS) && \
+ (!BOOST_WORKAROUND(__BORLANDC__, < 0x600))
+ template<typename S, typename C, typename T, typename A, typename M>
+ friend class chain_base;
+#else
+ public:
+#endif
+ virtual void notify() { }
+private:
+ chain_type* chain_;
+};
+
+//--------------Implementation of chain_base----------------------------------//
+
+template<typename Self, typename Ch, typename Tr, typename Alloc, typename Mode>
+inline std::streamsize chain_base<Self, Ch, Tr, Alloc, Mode>::read
+ (char_type* s, std::streamsize n)
+{ return iostreams::read(*list().front(), s, n); }
+
+template<typename Self, typename Ch, typename Tr, typename Alloc, typename Mode>
+inline std::streamsize chain_base<Self, Ch, Tr, Alloc, Mode>::write
+ (const char_type* s, std::streamsize n)
+{ return iostreams::write(*list().front(), s, n); }
+
+template<typename Self, typename Ch, typename Tr, typename Alloc, typename Mode>
+inline std::streampos chain_base<Self, Ch, Tr, Alloc, Mode>::seek
+ (stream_offset off, BOOST_IOS::seekdir way)
+{ return iostreams::seek(*list().front(), off, way); }
+
+template<typename Self, typename Ch, typename Tr, typename Alloc, typename Mode>
+void chain_base<Self, Ch, Tr, Alloc, Mode>::reset()
+{
+ using namespace std;
+ pimpl_->close();
+ pimpl_->reset();
+}
+
+template<typename Self, typename Ch, typename Tr, typename Alloc, typename Mode>
+bool chain_base<Self, Ch, Tr, Alloc, Mode>::is_complete() const
+{
+ return (pimpl_->flags_ & f_complete) != 0;
+}
+
+template<typename Self, typename Ch, typename Tr, typename Alloc, typename Mode>
+bool chain_base<Self, Ch, Tr, Alloc, Mode>::auto_close() const
+{
+ return (pimpl_->flags_ & f_auto_close) != 0;
+}
+
+template<typename Self, typename Ch, typename Tr, typename Alloc, typename Mode>
+void chain_base<Self, Ch, Tr, Alloc, Mode>::set_auto_close(bool close)
+{
+ pimpl_->flags_ =
+ (pimpl_->flags_ & ~f_auto_close) |
+ (close ? f_auto_close : 0);
+}
+
+template<typename Self, typename Ch, typename Tr, typename Alloc, typename Mode>
+bool chain_base<Self, Ch, Tr, Alloc, Mode>::strict_sync()
+{
+ typedef typename list_type::iterator iterator;
+ bool result = true;
+ for ( iterator first = list().begin(),
+ last = list().end();
+ first != last;
+ ++first )
+ {
+ bool s = (*first)->strict_sync();
+ result = result && s;
+ }
+ return result;
+}
+
+template<typename Self, typename Ch, typename Tr, typename Alloc, typename Mode>
+void chain_base<Self, Ch, Tr, Alloc, Mode>::pop()
+{
+ assert(!empty());
+ if (auto_close())
+ pimpl_->close();
+ streambuf_type* buf = 0;
+ std::swap(buf, list().back());
+ buf->set_auto_close(false);
+ buf->set_next(0);
+ delete buf;
+ list().pop_back();
+ pimpl_->flags_ &= ~f_complete;
+ if (auto_close() || list().empty())
+ pimpl_->flags_ &= ~f_open;
+}
+
+} // End namespace detail.
+
+} } // End namespaces iostreams, boost.
+
+#endif // #ifndef BOOST_IOSTREAMS_DETAIL_CHAIN_HPP_INCLUDED