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Diffstat (limited to 'src/third_party/boost-1.70.0/boost/detail/basic_pointerbuf.hpp')
-rw-r--r-- | src/third_party/boost-1.70.0/boost/detail/basic_pointerbuf.hpp | 139 |
1 files changed, 139 insertions, 0 deletions
diff --git a/src/third_party/boost-1.70.0/boost/detail/basic_pointerbuf.hpp b/src/third_party/boost-1.70.0/boost/detail/basic_pointerbuf.hpp new file mode 100644 index 00000000000..85618f92abe --- /dev/null +++ b/src/third_party/boost-1.70.0/boost/detail/basic_pointerbuf.hpp @@ -0,0 +1,139 @@ +//----------------------------------------------------------------------------- +// boost detail/templated_streams.hpp header file +// See http://www.boost.org for updates, documentation, and revision history. +//----------------------------------------------------------------------------- +// +// Copyright (c) 2013 John Maddock, Antony Polukhin +// +// +// 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_DETAIL_BASIC_POINTERBUF_HPP +#define BOOST_DETAIL_BASIC_POINTERBUF_HPP + +// MS compatible compilers support #pragma once +#if defined(_MSC_VER) +# pragma once +#endif + +#include "boost/config.hpp" +#include <streambuf> + +namespace boost { namespace detail { + +// +// class basic_pointerbuf: +// acts as a stream buffer which wraps around a pair of pointers: +// +template <class charT, class BufferT > +class basic_pointerbuf : public BufferT { +protected: + typedef BufferT base_type; + typedef basic_pointerbuf<charT, BufferT> this_type; + typedef typename base_type::int_type int_type; + typedef typename base_type::char_type char_type; + typedef typename base_type::pos_type pos_type; + typedef ::std::streamsize streamsize; + typedef typename base_type::off_type off_type; + +public: + basic_pointerbuf() : base_type() { this_type::setbuf(0, 0); } + const charT* getnext() { return this->gptr(); } + +#ifndef BOOST_NO_USING_TEMPLATE + using base_type::pptr; + using base_type::pbase; +#else + charT* pptr() const { return base_type::pptr(); } + charT* pbase() const { return base_type::pbase(); } +#endif + +protected: + // VC mistakenly assumes that `setbuf` and other functions are not referenced. + // Marking those functions with `inline` suppresses the warnings. + // There must be no harm from marking virtual functions as inline: inline virtual + // call can be inlined ONLY when the compiler knows the "exact class". + inline base_type* setbuf(char_type* s, streamsize n); + inline typename this_type::pos_type seekpos(pos_type sp, ::std::ios_base::openmode which); + inline typename this_type::pos_type seekoff(off_type off, ::std::ios_base::seekdir way, ::std::ios_base::openmode which); + +private: + basic_pointerbuf& operator=(const basic_pointerbuf&); + basic_pointerbuf(const basic_pointerbuf&); +}; + +template<class charT, class BufferT> +BufferT* +basic_pointerbuf<charT, BufferT>::setbuf(char_type* s, streamsize n) +{ + this->setg(s, s, s + n); + return this; +} + +template<class charT, class BufferT> +typename basic_pointerbuf<charT, BufferT>::pos_type +basic_pointerbuf<charT, BufferT>::seekoff(off_type off, ::std::ios_base::seekdir way, ::std::ios_base::openmode which) +{ + typedef typename boost::int_t<sizeof(way) * CHAR_BIT>::least cast_type; + + if(which & ::std::ios_base::out) + return pos_type(off_type(-1)); + std::ptrdiff_t size = this->egptr() - this->eback(); + std::ptrdiff_t pos = this->gptr() - this->eback(); + charT* g = this->eback(); + switch(static_cast<cast_type>(way)) + { + case ::std::ios_base::beg: + if((off < 0) || (off > size)) + return pos_type(off_type(-1)); + else + this->setg(g, g + off, g + size); + break; + case ::std::ios_base::end: + if((off < 0) || (off > size)) + return pos_type(off_type(-1)); + else + this->setg(g, g + size - off, g + size); + break; + case ::std::ios_base::cur: + { + std::ptrdiff_t newpos = static_cast<std::ptrdiff_t>(pos + off); + if((newpos < 0) || (newpos > size)) + return pos_type(off_type(-1)); + else + this->setg(g, g + newpos, g + size); + break; + } + default: ; + } +#ifdef BOOST_MSVC +#pragma warning(push) +#pragma warning(disable:4244) +#endif + return static_cast<pos_type>(this->gptr() - this->eback()); +#ifdef BOOST_MSVC +#pragma warning(pop) +#endif +} + +template<class charT, class BufferT> +typename basic_pointerbuf<charT, BufferT>::pos_type +basic_pointerbuf<charT, BufferT>::seekpos(pos_type sp, ::std::ios_base::openmode which) +{ + if(which & ::std::ios_base::out) + return pos_type(off_type(-1)); + off_type size = static_cast<off_type>(this->egptr() - this->eback()); + charT* g = this->eback(); + if(off_type(sp) <= size) + { + this->setg(g, g + off_type(sp), g + size); + } + return pos_type(off_type(-1)); +} + +}} // namespace boost::detail + +#endif // BOOST_DETAIL_BASIC_POINTERBUF_HPP + |