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Diffstat (limited to 'boost/format/alt_sstream.hpp')
| -rw-r--r-- | boost/format/alt_sstream.hpp | 176 |
1 files changed, 176 insertions, 0 deletions
diff --git a/boost/format/alt_sstream.hpp b/boost/format/alt_sstream.hpp new file mode 100644 index 0000000000..e236be3526 --- /dev/null +++ b/boost/format/alt_sstream.hpp @@ -0,0 +1,176 @@ +// ---------------------------------------------------------------------------- +// alt_sstream.hpp : alternative stringstream +// ---------------------------------------------------------------------------- + +// Copyright Samuel Krempp 2003. Use, modification, and distribution are +// subject to 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/format for library home page + +// ---------------------------------------------------------------------------- + + + +#ifndef BOOST_SK_ALT_SSTREAM_HPP +#define BOOST_SK_ALT_SSTREAM_HPP + +#include <string> +#include <boost/format/detail/compat_workarounds.hpp> +#include <boost/utility/base_from_member.hpp> +#include <boost/shared_ptr.hpp> +#include <boost/assert.hpp> + +namespace boost { + namespace io { + + template<class Ch, class Tr=::std::char_traits<Ch>, + class Alloc=::std::allocator<Ch> > + class basic_altstringbuf; + + template<class Ch, class Tr =::std::char_traits<Ch>, + class Alloc=::std::allocator<Ch> > + class basic_oaltstringstream; + + + template<class Ch, class Tr, class Alloc> + class basic_altstringbuf + : public ::std::basic_streambuf<Ch, Tr> + { + typedef ::std::basic_streambuf<Ch, Tr> streambuf_t; + typedef typename CompatAlloc<Alloc>::compatible_type compat_allocator_type; + typedef typename CompatTraits<Tr>::compatible_type compat_traits_type; + public: + typedef Ch char_type; + typedef Tr traits_type; + typedef typename compat_traits_type::int_type int_type; + typedef typename compat_traits_type::pos_type pos_type; + typedef typename compat_traits_type::off_type off_type; + typedef Alloc allocator_type; + typedef ::std::basic_string<Ch, Tr, Alloc> string_type; + typedef typename string_type::size_type size_type; + + typedef ::std::streamsize streamsize; + + + explicit basic_altstringbuf(std::ios_base::openmode mode + = std::ios_base::in | std::ios_base::out) + : putend_(NULL), is_allocated_(false), mode_(mode) + {} + explicit basic_altstringbuf(const string_type& s, + ::std::ios_base::openmode mode + = ::std::ios_base::in | ::std::ios_base::out) + : putend_(NULL), is_allocated_(false), mode_(mode) + { dealloc(); str(s); } + virtual ~basic_altstringbuf() + { dealloc(); } + using streambuf_t::pbase; + using streambuf_t::pptr; + using streambuf_t::epptr; + using streambuf_t::eback; + using streambuf_t::gptr; + using streambuf_t::egptr; + + void clear_buffer(); + void str(const string_type& s); + + // 0-copy access : + Ch * begin() const; + size_type size() const; + size_type cur_size() const; // stop at current pointer + Ch * pend() const // the highest position reached by pptr() since creation + { return ((putend_ < pptr()) ? pptr() : putend_); } + size_type pcount() const + { return static_cast<size_type>( pptr() - pbase()) ;} + + // copy buffer to string : + string_type str() const + { return string_type(begin(), size()); } + string_type cur_str() const + { return string_type(begin(), cur_size()); } + protected: + explicit basic_altstringbuf (basic_altstringbuf * s, + ::std::ios_base::openmode mode + = ::std::ios_base::in | ::std::ios_base::out) + : putend_(NULL), is_allocated_(false), mode_(mode) + { dealloc(); str(s); } + + virtual pos_type seekoff(off_type off, ::std::ios_base::seekdir way, + ::std::ios_base::openmode which + = ::std::ios_base::in | ::std::ios_base::out); + virtual pos_type seekpos (pos_type pos, + ::std::ios_base::openmode which + = ::std::ios_base::in | ::std::ios_base::out); + virtual int_type underflow(); + virtual int_type pbackfail(int_type meta = compat_traits_type::eof()); + virtual int_type overflow(int_type meta = compat_traits_type::eof()); + void dealloc(); + private: + enum { alloc_min = 256}; // minimum size of allocations + + Ch *putend_; // remembers (over seeks) the highest value of pptr() + bool is_allocated_; + ::std::ios_base::openmode mode_; + compat_allocator_type alloc_; // the allocator object + }; + + +// --- class basic_oaltstringstream ---------------------------------------- + template <class Ch, class Tr, class Alloc> + class basic_oaltstringstream + : private base_from_member< shared_ptr< basic_altstringbuf< Ch, Tr, Alloc> > >, + public ::std::basic_ostream<Ch, Tr> + { + class No_Op { + // used as no-op deleter for (not-owner) shared_pointers + public: + template<class T> + const T & operator()(const T & arg) { return arg; } + }; + typedef ::std::basic_ostream<Ch, Tr> stream_t; + typedef boost::base_from_member<boost::shared_ptr< + basic_altstringbuf<Ch,Tr, Alloc> > > + pbase_type; + typedef ::std::basic_string<Ch, Tr, Alloc> string_type; + typedef typename string_type::size_type size_type; + typedef basic_altstringbuf<Ch, Tr, Alloc> stringbuf_t; + public: + typedef Alloc allocator_type; + basic_oaltstringstream() + : pbase_type(new stringbuf_t), stream_t(rdbuf()) + { } + basic_oaltstringstream(::boost::shared_ptr<stringbuf_t> buf) + : pbase_type(buf), stream_t(rdbuf()) + { } + basic_oaltstringstream(stringbuf_t * buf) + : pbase_type(buf, No_Op() ), stream_t(rdbuf()) + { } + stringbuf_t * rdbuf() const + { return pbase_type::member.get(); } + void clear_buffer() + { rdbuf()->clear_buffer(); } + + // 0-copy access : + Ch * begin() const + { return rdbuf()->begin(); } + size_type size() const + { return rdbuf()->size(); } + size_type cur_size() const // stops at current position + { return rdbuf()->cur_size(); } + + // copy buffer to string : + string_type str() const // [pbase, epptr[ + { return rdbuf()->str(); } + string_type cur_str() const // [pbase, pptr[ + { return rdbuf()->cur_str(); } + void str(const string_type& s) + { rdbuf()->str(s); } + }; + + } // N.S. io +} // N.S. boost + +#include <boost/format/alt_sstream_impl.hpp> + +#endif // include guard + |