177 lines
7.4 KiB
C++
177 lines
7.4 KiB
C++
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// ----------------------------------------------------------------------------
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// alt_sstream.hpp : alternative stringstream
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// ----------------------------------------------------------------------------
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// Copyright Samuel Krempp 2003. Use, modification, and distribution are
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// subject to the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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// See http://www.boost.org/libs/format for library home page
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// ----------------------------------------------------------------------------
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#ifndef BOOST_SK_ALT_SSTREAM_HPP
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#define BOOST_SK_ALT_SSTREAM_HPP
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#include <string>
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#include <boost/format/detail/compat_workarounds.hpp>
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#include <boost/utility/base_from_member.hpp>
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#include <boost/shared_ptr.hpp>
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#include <boost/assert.hpp>
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namespace boost {
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namespace io {
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template<class Ch, class Tr=::std::char_traits<Ch>,
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class Alloc=::std::allocator<Ch> >
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class basic_altstringbuf;
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template<class Ch, class Tr =::std::char_traits<Ch>,
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class Alloc=::std::allocator<Ch> >
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class basic_oaltstringstream;
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template<class Ch, class Tr, class Alloc>
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class basic_altstringbuf
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: public ::std::basic_streambuf<Ch, Tr>
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{
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typedef ::std::basic_streambuf<Ch, Tr> streambuf_t;
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typedef typename CompatAlloc<Alloc>::compatible_type compat_allocator_type;
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typedef typename CompatTraits<Tr>::compatible_type compat_traits_type;
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public:
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typedef Ch char_type;
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typedef Tr traits_type;
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typedef typename compat_traits_type::int_type int_type;
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typedef typename compat_traits_type::pos_type pos_type;
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typedef typename compat_traits_type::off_type off_type;
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typedef Alloc allocator_type;
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typedef ::std::basic_string<Ch, Tr, Alloc> string_type;
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typedef typename string_type::size_type size_type;
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typedef ::std::streamsize streamsize;
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explicit basic_altstringbuf(std::ios_base::openmode mode
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= std::ios_base::in | std::ios_base::out)
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: putend_(NULL), is_allocated_(false), mode_(mode)
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{}
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explicit basic_altstringbuf(const string_type& s,
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::std::ios_base::openmode mode
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= ::std::ios_base::in | ::std::ios_base::out)
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: putend_(NULL), is_allocated_(false), mode_(mode)
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{ dealloc(); str(s); }
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virtual ~basic_altstringbuf()
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{ dealloc(); }
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using streambuf_t::pbase;
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using streambuf_t::pptr;
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using streambuf_t::epptr;
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using streambuf_t::eback;
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using streambuf_t::gptr;
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using streambuf_t::egptr;
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void clear_buffer();
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void str(const string_type& s);
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// 0-copy access :
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Ch * begin() const;
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size_type size() const;
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size_type cur_size() const; // stop at current pointer
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Ch * pend() const // the highest position reached by pptr() since creation
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{ return ((putend_ < pptr()) ? pptr() : putend_); }
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size_type pcount() const
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{ return static_cast<size_type>( pptr() - pbase()) ;}
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// copy buffer to string :
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string_type str() const
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{ return string_type(begin(), size()); }
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string_type cur_str() const
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{ return string_type(begin(), cur_size()); }
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protected:
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explicit basic_altstringbuf (basic_altstringbuf * s,
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::std::ios_base::openmode mode
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= ::std::ios_base::in | ::std::ios_base::out)
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: putend_(NULL), is_allocated_(false), mode_(mode)
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{ dealloc(); str(s); }
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virtual pos_type seekoff(off_type off, ::std::ios_base::seekdir way,
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::std::ios_base::openmode which
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= ::std::ios_base::in | ::std::ios_base::out);
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virtual pos_type seekpos (pos_type pos,
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::std::ios_base::openmode which
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= ::std::ios_base::in | ::std::ios_base::out);
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virtual int_type underflow();
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virtual int_type pbackfail(int_type meta = compat_traits_type::eof());
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virtual int_type overflow(int_type meta = compat_traits_type::eof());
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void dealloc();
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private:
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enum { alloc_min = 256}; // minimum size of allocations
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Ch *putend_; // remembers (over seeks) the highest value of pptr()
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bool is_allocated_;
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::std::ios_base::openmode mode_;
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compat_allocator_type alloc_; // the allocator object
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};
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// --- class basic_oaltstringstream ----------------------------------------
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template <class Ch, class Tr, class Alloc>
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class basic_oaltstringstream
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: private base_from_member< shared_ptr< basic_altstringbuf< Ch, Tr, Alloc> > >,
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public ::std::basic_ostream<Ch, Tr>
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{
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class No_Op {
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// used as no-op deleter for (not-owner) shared_pointers
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public:
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template<class T>
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const T & operator()(const T & arg) { return arg; }
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};
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typedef ::std::basic_ostream<Ch, Tr> stream_t;
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typedef boost::base_from_member<boost::shared_ptr<
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basic_altstringbuf<Ch,Tr, Alloc> > >
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pbase_type;
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typedef ::std::basic_string<Ch, Tr, Alloc> string_type;
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typedef typename string_type::size_type size_type;
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typedef basic_altstringbuf<Ch, Tr, Alloc> stringbuf_t;
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public:
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typedef Alloc allocator_type;
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basic_oaltstringstream()
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: pbase_type(new stringbuf_t), stream_t(rdbuf())
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{ }
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basic_oaltstringstream(::boost::shared_ptr<stringbuf_t> buf)
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: pbase_type(buf), stream_t(rdbuf())
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{ }
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basic_oaltstringstream(stringbuf_t * buf)
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: pbase_type(buf, No_Op() ), stream_t(rdbuf())
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{ }
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stringbuf_t * rdbuf() const
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{ return pbase_type::member.get(); }
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void clear_buffer()
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{ rdbuf()->clear_buffer(); }
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// 0-copy access :
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Ch * begin() const
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{ return rdbuf()->begin(); }
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size_type size() const
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{ return rdbuf()->size(); }
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size_type cur_size() const // stops at current position
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{ return rdbuf()->cur_size(); }
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// copy buffer to string :
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string_type str() const // [pbase, epptr[
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{ return rdbuf()->str(); }
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string_type cur_str() const // [pbase, pptr[
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{ return rdbuf()->cur_str(); }
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void str(const string_type& s)
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{ rdbuf()->str(s); }
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};
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} // N.S. io
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} // N.S. boost
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#include <boost/format/alt_sstream_impl.hpp>
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#endif // include guard
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