Initial Commit
This commit is contained in:
Jordan Sherer
@@ -0,0 +1,785 @@
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// Copyright Kevlin Henney, 2000-2005.
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// Copyright Alexander Nasonov, 2006-2010.
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// Copyright Antony Polukhin, 2011-2016.
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//
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// Distributed under the Boost Software License, Version 1.0. (See
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// accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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//
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// what: lexical_cast custom keyword cast
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// who: contributed by Kevlin Henney,
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// enhanced with contributions from Terje Slettebo,
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// with additional fixes and suggestions from Gennaro Prota,
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// Beman Dawes, Dave Abrahams, Daryle Walker, Peter Dimov,
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// Alexander Nasonov, Antony Polukhin, Justin Viiret, Michael Hofmann,
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// Cheng Yang, Matthew Bradbury, David W. Birdsall, Pavel Korzh and other Boosters
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// when: November 2000, March 2003, June 2005, June 2006, March 2011 - 2014, Nowember 2016
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#ifndef BOOST_LEXICAL_CAST_DETAIL_CONVERTER_LEXICAL_STREAMS_HPP
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#define BOOST_LEXICAL_CAST_DETAIL_CONVERTER_LEXICAL_STREAMS_HPP
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#include <boost/config.hpp>
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#ifdef BOOST_HAS_PRAGMA_ONCE
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# pragma once
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#endif
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#if defined(BOOST_NO_STRINGSTREAM) || defined(BOOST_NO_STD_WSTRING)
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#define BOOST_LCAST_NO_WCHAR_T
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#endif
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#include <cstddef>
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#include <string>
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#include <cstring>
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#include <cstdio>
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#include <boost/limits.hpp>
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#include <boost/mpl/if.hpp>
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#include <boost/type_traits/is_pointer.hpp>
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#include <boost/static_assert.hpp>
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#include <boost/detail/workaround.hpp>
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#ifndef BOOST_NO_STD_LOCALE
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# include <locale>
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#else
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# ifndef BOOST_LEXICAL_CAST_ASSUME_C_LOCALE
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// Getting error at this point means, that your STL library is old/lame/misconfigured.
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// If nothing can be done with STL library, define BOOST_LEXICAL_CAST_ASSUME_C_LOCALE,
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// but beware: lexical_cast will understand only 'C' locale delimeters and thousands
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// separators.
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# error "Unable to use <locale> header. Define BOOST_LEXICAL_CAST_ASSUME_C_LOCALE to force "
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# error "boost::lexical_cast to use only 'C' locale during conversions."
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# endif
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#endif
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#ifdef BOOST_NO_STRINGSTREAM
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#include <strstream>
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#else
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#include <sstream>
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#endif
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#include <boost/lexical_cast/detail/lcast_char_constants.hpp>
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#include <boost/lexical_cast/detail/lcast_unsigned_converters.hpp>
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#include <boost/lexical_cast/detail/inf_nan.hpp>
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#include <istream>
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#ifndef BOOST_NO_CXX11_HDR_ARRAY
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#include <array>
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#endif
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#include <boost/array.hpp>
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#include <boost/type_traits/make_unsigned.hpp>
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#include <boost/type_traits/is_integral.hpp>
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#include <boost/type_traits/is_float.hpp>
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#include <boost/range/iterator_range_core.hpp>
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#include <boost/container/container_fwd.hpp>
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#include <boost/integer.hpp>
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#include <boost/detail/basic_pointerbuf.hpp>
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#include <boost/noncopyable.hpp>
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#ifndef BOOST_NO_CWCHAR
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# include <cwchar>
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#endif
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namespace boost {
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namespace detail // basic_unlockedbuf
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{
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// acts as a stream buffer which wraps around a pair of pointers
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// and gives acces to internals
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template <class BufferType, class CharT>
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class basic_unlockedbuf : public basic_pointerbuf<CharT, BufferType> {
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public:
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typedef basic_pointerbuf<CharT, BufferType> base_type;
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typedef BOOST_DEDUCED_TYPENAME base_type::streamsize streamsize;
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#ifndef BOOST_NO_USING_TEMPLATE
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using base_type::pptr;
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using base_type::pbase;
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using base_type::setbuf;
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#else
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charT* pptr() const { return base_type::pptr(); }
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charT* pbase() const { return base_type::pbase(); }
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BufferType* setbuf(char_type* s, streamsize n) { return base_type::setbuf(s, n); }
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#endif
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};
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}
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namespace detail
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{
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struct do_not_construct_out_buffer_t{};
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struct do_not_construct_out_stream_t{
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do_not_construct_out_stream_t(do_not_construct_out_buffer_t*){}
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};
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template <class CharT, class Traits>
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struct out_stream_helper_trait {
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#if defined(BOOST_NO_STRINGSTREAM)
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typedef std::ostream out_stream_t;
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typedef basic_unlockedbuf<std::strstreambuf, char> stringbuffer_t;
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#elif defined(BOOST_NO_STD_LOCALE)
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typedef std::ostream out_stream_t;
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typedef basic_unlockedbuf<std::stringbuf, char> stringbuffer_t;
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typedef basic_unlockedbuf<std::streambuf, char> buffer_t;
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#else
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typedef std::basic_ostream<CharT, Traits> out_stream_t;
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typedef basic_unlockedbuf<std::basic_stringbuf<CharT, Traits>, CharT> stringbuffer_t;
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typedef basic_unlockedbuf<std::basic_streambuf<CharT, Traits>, CharT> buffer_t;
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#endif
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};
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}
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namespace detail // optimized stream wrappers
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{
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template< class CharT // a result of widest_char transformation
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, class Traits
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, bool RequiresStringbuffer
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, std::size_t CharacterBufferSize
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>
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class lexical_istream_limited_src: boost::noncopyable {
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typedef BOOST_DEDUCED_TYPENAME boost::mpl::if_c<
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RequiresStringbuffer,
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BOOST_DEDUCED_TYPENAME out_stream_helper_trait<CharT, Traits>::out_stream_t,
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do_not_construct_out_stream_t
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>::type deduced_out_stream_t;
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typedef BOOST_DEDUCED_TYPENAME boost::mpl::if_c<
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RequiresStringbuffer,
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BOOST_DEDUCED_TYPENAME out_stream_helper_trait<CharT, Traits>::stringbuffer_t,
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do_not_construct_out_buffer_t
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>::type deduced_out_buffer_t;
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deduced_out_buffer_t out_buffer;
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deduced_out_stream_t out_stream;
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CharT buffer[CharacterBufferSize];
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// After the `operator <<` finishes, `[start, finish)` is
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// the range to output by `operator >>`
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const CharT* start;
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const CharT* finish;
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public:
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lexical_istream_limited_src() BOOST_NOEXCEPT
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: out_buffer()
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, out_stream(&out_buffer)
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, start(buffer)
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, finish(buffer + CharacterBufferSize)
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{}
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const CharT* cbegin() const BOOST_NOEXCEPT {
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return start;
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}
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const CharT* cend() const BOOST_NOEXCEPT {
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return finish;
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}
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private:
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/************************************ HELPER FUNCTIONS FOR OPERATORS << ( ... ) ********************************/
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bool shl_char(CharT ch) BOOST_NOEXCEPT {
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Traits::assign(buffer[0], ch);
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finish = start + 1;
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return true;
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}
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#ifndef BOOST_LCAST_NO_WCHAR_T
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template <class T>
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bool shl_char(T ch) {
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BOOST_STATIC_ASSERT_MSG(( sizeof(T) <= sizeof(CharT)) ,
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"boost::lexical_cast does not support narrowing of char types."
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"Use boost::locale instead" );
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#ifndef BOOST_LEXICAL_CAST_ASSUME_C_LOCALE
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std::locale loc;
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CharT const w = BOOST_USE_FACET(std::ctype<CharT>, loc).widen(ch);
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#else
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CharT const w = static_cast<CharT>(ch);
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#endif
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Traits::assign(buffer[0], w);
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finish = start + 1;
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return true;
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}
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#endif
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bool shl_char_array(CharT const* str) BOOST_NOEXCEPT {
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start = str;
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finish = start + Traits::length(str);
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return true;
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}
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template <class T>
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bool shl_char_array(T const* str) {
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BOOST_STATIC_ASSERT_MSG(( sizeof(T) <= sizeof(CharT)),
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"boost::lexical_cast does not support narrowing of char types."
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"Use boost::locale instead" );
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return shl_input_streamable(str);
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}
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bool shl_char_array_limited(CharT const* str, std::size_t max_size) BOOST_NOEXCEPT {
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start = str;
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finish = std::find(start, start + max_size, Traits::to_char_type(0));
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return true;
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}
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template<typename InputStreamable>
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bool shl_input_streamable(InputStreamable& input) {
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#if defined(BOOST_NO_STRINGSTREAM) || defined(BOOST_NO_STD_LOCALE)
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// If you have compilation error at this point, than your STL library
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// does not support such conversions. Try updating it.
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BOOST_STATIC_ASSERT((boost::is_same<char, CharT>::value));
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#endif
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#ifndef BOOST_NO_EXCEPTIONS
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out_stream.exceptions(std::ios::badbit);
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try {
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#endif
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bool const result = !(out_stream << input).fail();
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const deduced_out_buffer_t* const p = static_cast<deduced_out_buffer_t*>(
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out_stream.rdbuf()
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);
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start = p->pbase();
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finish = p->pptr();
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return result;
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#ifndef BOOST_NO_EXCEPTIONS
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} catch (const ::std::ios_base::failure& /*f*/) {
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return false;
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}
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#endif
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}
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template <class T>
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inline bool shl_unsigned(const T n) {
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CharT* tmp_finish = buffer + CharacterBufferSize;
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start = lcast_put_unsigned<Traits, T, CharT>(n, tmp_finish).convert();
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finish = tmp_finish;
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return true;
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}
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template <class T>
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inline bool shl_signed(const T n) {
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CharT* tmp_finish = buffer + CharacterBufferSize;
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typedef BOOST_DEDUCED_TYPENAME boost::make_unsigned<T>::type utype;
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CharT* tmp_start = lcast_put_unsigned<Traits, utype, CharT>(lcast_to_unsigned(n), tmp_finish).convert();
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if (n < 0) {
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--tmp_start;
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CharT const minus = lcast_char_constants<CharT>::minus;
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Traits::assign(*tmp_start, minus);
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}
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start = tmp_start;
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finish = tmp_finish;
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return true;
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}
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template <class T, class SomeCharT>
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bool shl_real_type(const T& val, SomeCharT* /*begin*/) {
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lcast_set_precision(out_stream, &val);
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return shl_input_streamable(val);
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}
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bool shl_real_type(float val, char* begin) {
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using namespace std;
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const double val_as_double = val;
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finish = start +
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#if defined(_MSC_VER) && (_MSC_VER >= 1400) && !defined(__SGI_STL_PORT) && !defined(_STLPORT_VERSION)
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sprintf_s(begin, CharacterBufferSize,
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#else
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sprintf(begin,
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#endif
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"%.*g", static_cast<int>(boost::detail::lcast_get_precision<float>()), val_as_double);
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return finish > start;
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}
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bool shl_real_type(double val, char* begin) {
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using namespace std;
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finish = start +
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#if defined(_MSC_VER) && (_MSC_VER >= 1400) && !defined(__SGI_STL_PORT) && !defined(_STLPORT_VERSION)
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sprintf_s(begin, CharacterBufferSize,
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#else
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sprintf(begin,
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#endif
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"%.*g", static_cast<int>(boost::detail::lcast_get_precision<double>()), val);
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return finish > start;
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}
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#ifndef __MINGW32__
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bool shl_real_type(long double val, char* begin) {
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using namespace std;
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finish = start +
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#if defined(_MSC_VER) && (_MSC_VER >= 1400) && !defined(__SGI_STL_PORT) && !defined(_STLPORT_VERSION)
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sprintf_s(begin, CharacterBufferSize,
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#else
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sprintf(begin,
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#endif
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"%.*Lg", static_cast<int>(boost::detail::lcast_get_precision<long double>()), val );
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return finish > start;
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}
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#endif
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#if !defined(BOOST_LCAST_NO_WCHAR_T) && !defined(BOOST_NO_SWPRINTF) && !defined(__MINGW32__)
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bool shl_real_type(float val, wchar_t* begin) {
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using namespace std;
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const double val_as_double = val;
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finish = start + swprintf(begin, CharacterBufferSize,
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L"%.*g",
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static_cast<int>(boost::detail::lcast_get_precision<float >()),
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val_as_double );
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return finish > start;
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}
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bool shl_real_type(double val, wchar_t* begin) {
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using namespace std;
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finish = start + swprintf(begin, CharacterBufferSize,
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L"%.*g", static_cast<int>(boost::detail::lcast_get_precision<double >()), val );
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return finish > start;
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}
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bool shl_real_type(long double val, wchar_t* begin) {
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using namespace std;
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finish = start + swprintf(begin, CharacterBufferSize,
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L"%.*Lg", static_cast<int>(boost::detail::lcast_get_precision<long double >()), val );
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return finish > start;
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}
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#endif
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template <class T>
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bool shl_real(T val) {
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CharT* tmp_finish = buffer + CharacterBufferSize;
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if (put_inf_nan(buffer, tmp_finish, val)) {
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finish = tmp_finish;
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return true;
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}
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return shl_real_type(val, static_cast<CharT*>(buffer));
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}
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||||
|
||||
/************************************ OPERATORS << ( ... ) ********************************/
|
||||
public:
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||||
template<class Alloc>
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bool operator<<(std::basic_string<CharT,Traits,Alloc> const& str) BOOST_NOEXCEPT {
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start = str.data();
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finish = start + str.length();
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return true;
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}
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template<class Alloc>
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bool operator<<(boost::container::basic_string<CharT,Traits,Alloc> const& str) BOOST_NOEXCEPT {
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start = str.data();
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finish = start + str.length();
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return true;
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}
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bool operator<<(bool value) BOOST_NOEXCEPT {
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CharT const czero = lcast_char_constants<CharT>::zero;
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Traits::assign(buffer[0], Traits::to_char_type(czero + value));
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finish = start + 1;
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return true;
|
||||
}
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||||
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template <class C>
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||||
BOOST_DEDUCED_TYPENAME boost::disable_if<boost::is_const<C>, bool>::type
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||||
operator<<(const iterator_range<C*>& rng) BOOST_NOEXCEPT {
|
||||
return (*this) << iterator_range<const C*>(rng.begin(), rng.end());
|
||||
}
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||||
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||||
bool operator<<(const iterator_range<const CharT*>& rng) BOOST_NOEXCEPT {
|
||||
start = rng.begin();
|
||||
finish = rng.end();
|
||||
return true;
|
||||
}
|
||||
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||||
bool operator<<(const iterator_range<const signed char*>& rng) BOOST_NOEXCEPT {
|
||||
return (*this) << iterator_range<const char*>(
|
||||
reinterpret_cast<const char*>(rng.begin()),
|
||||
reinterpret_cast<const char*>(rng.end())
|
||||
);
|
||||
}
|
||||
|
||||
bool operator<<(const iterator_range<const unsigned char*>& rng) BOOST_NOEXCEPT {
|
||||
return (*this) << iterator_range<const char*>(
|
||||
reinterpret_cast<const char*>(rng.begin()),
|
||||
reinterpret_cast<const char*>(rng.end())
|
||||
);
|
||||
}
|
||||
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||||
bool operator<<(char ch) { return shl_char(ch); }
|
||||
bool operator<<(unsigned char ch) { return ((*this) << static_cast<char>(ch)); }
|
||||
bool operator<<(signed char ch) { return ((*this) << static_cast<char>(ch)); }
|
||||
#if !defined(BOOST_LCAST_NO_WCHAR_T)
|
||||
bool operator<<(wchar_t const* str) { return shl_char_array(str); }
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||||
bool operator<<(wchar_t * str) { return shl_char_array(str); }
|
||||
#ifndef BOOST_NO_INTRINSIC_WCHAR_T
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||||
bool operator<<(wchar_t ch) { return shl_char(ch); }
|
||||
#endif
|
||||
#endif
|
||||
#if !defined(BOOST_NO_CXX11_CHAR16_T) && !defined(BOOST_NO_CXX11_UNICODE_LITERALS)
|
||||
bool operator<<(char16_t ch) { return shl_char(ch); }
|
||||
bool operator<<(char16_t * str) { return shl_char_array(str); }
|
||||
bool operator<<(char16_t const * str) { return shl_char_array(str); }
|
||||
#endif
|
||||
#if !defined(BOOST_NO_CXX11_CHAR32_T) && !defined(BOOST_NO_CXX11_UNICODE_LITERALS)
|
||||
bool operator<<(char32_t ch) { return shl_char(ch); }
|
||||
bool operator<<(char32_t * str) { return shl_char_array(str); }
|
||||
bool operator<<(char32_t const * str) { return shl_char_array(str); }
|
||||
#endif
|
||||
bool operator<<(unsigned char const* ch) { return ((*this) << reinterpret_cast<char const*>(ch)); }
|
||||
bool operator<<(unsigned char * ch) { return ((*this) << reinterpret_cast<char *>(ch)); }
|
||||
bool operator<<(signed char const* ch) { return ((*this) << reinterpret_cast<char const*>(ch)); }
|
||||
bool operator<<(signed char * ch) { return ((*this) << reinterpret_cast<char *>(ch)); }
|
||||
bool operator<<(char const* str) { return shl_char_array(str); }
|
||||
bool operator<<(char* str) { return shl_char_array(str); }
|
||||
bool operator<<(short n) { return shl_signed(n); }
|
||||
bool operator<<(int n) { return shl_signed(n); }
|
||||
bool operator<<(long n) { return shl_signed(n); }
|
||||
bool operator<<(unsigned short n) { return shl_unsigned(n); }
|
||||
bool operator<<(unsigned int n) { return shl_unsigned(n); }
|
||||
bool operator<<(unsigned long n) { return shl_unsigned(n); }
|
||||
|
||||
#if defined(BOOST_HAS_LONG_LONG)
|
||||
bool operator<<(boost::ulong_long_type n) { return shl_unsigned(n); }
|
||||
bool operator<<(boost::long_long_type n) { return shl_signed(n); }
|
||||
#elif defined(BOOST_HAS_MS_INT64)
|
||||
bool operator<<(unsigned __int64 n) { return shl_unsigned(n); }
|
||||
bool operator<<( __int64 n) { return shl_signed(n); }
|
||||
#endif
|
||||
|
||||
#ifdef BOOST_HAS_INT128
|
||||
bool operator<<(const boost::uint128_type& n) { return shl_unsigned(n); }
|
||||
bool operator<<(const boost::int128_type& n) { return shl_signed(n); }
|
||||
#endif
|
||||
bool operator<<(float val) { return shl_real(val); }
|
||||
bool operator<<(double val) { return shl_real(val); }
|
||||
bool operator<<(long double val) {
|
||||
#ifndef __MINGW32__
|
||||
return shl_real(val);
|
||||
#else
|
||||
return shl_real(static_cast<double>(val));
|
||||
#endif
|
||||
}
|
||||
|
||||
// Adding constness to characters. Constness does not change layout
|
||||
template <class C, std::size_t N>
|
||||
BOOST_DEDUCED_TYPENAME boost::disable_if<boost::is_const<C>, bool>::type
|
||||
operator<<(boost::array<C, N> const& input) BOOST_NOEXCEPT {
|
||||
BOOST_STATIC_ASSERT_MSG(
|
||||
(sizeof(boost::array<const C, N>) == sizeof(boost::array<C, N>)),
|
||||
"boost::array<C, N> and boost::array<const C, N> must have exactly the same layout."
|
||||
);
|
||||
return ((*this) << reinterpret_cast<boost::array<const C, N> const& >(input));
|
||||
}
|
||||
|
||||
template <std::size_t N>
|
||||
bool operator<<(boost::array<const CharT, N> const& input) BOOST_NOEXCEPT {
|
||||
return shl_char_array_limited(input.data(), N);
|
||||
}
|
||||
|
||||
template <std::size_t N>
|
||||
bool operator<<(boost::array<const unsigned char, N> const& input) BOOST_NOEXCEPT {
|
||||
return ((*this) << reinterpret_cast<boost::array<const char, N> const& >(input));
|
||||
}
|
||||
|
||||
template <std::size_t N>
|
||||
bool operator<<(boost::array<const signed char, N> const& input) BOOST_NOEXCEPT {
|
||||
return ((*this) << reinterpret_cast<boost::array<const char, N> const& >(input));
|
||||
}
|
||||
|
||||
#ifndef BOOST_NO_CXX11_HDR_ARRAY
|
||||
// Making a Boost.Array from std::array
|
||||
template <class C, std::size_t N>
|
||||
bool operator<<(std::array<C, N> const& input) BOOST_NOEXCEPT {
|
||||
BOOST_STATIC_ASSERT_MSG(
|
||||
(sizeof(std::array<C, N>) == sizeof(boost::array<C, N>)),
|
||||
"std::array and boost::array must have exactly the same layout. "
|
||||
"Bug in implementation of std::array or boost::array."
|
||||
);
|
||||
return ((*this) << reinterpret_cast<boost::array<C, N> const& >(input));
|
||||
}
|
||||
#endif
|
||||
template <class InStreamable>
|
||||
bool operator<<(const InStreamable& input) { return shl_input_streamable(input); }
|
||||
};
|
||||
|
||||
|
||||
template <class CharT, class Traits>
|
||||
class lexical_ostream_limited_src: boost::noncopyable {
|
||||
//`[start, finish)` is the range to output by `operator >>`
|
||||
const CharT* start;
|
||||
const CharT* const finish;
|
||||
|
||||
public:
|
||||
lexical_ostream_limited_src(const CharT* begin, const CharT* end) BOOST_NOEXCEPT
|
||||
: start(begin)
|
||||
, finish(end)
|
||||
{}
|
||||
|
||||
/************************************ HELPER FUNCTIONS FOR OPERATORS >> ( ... ) ********************************/
|
||||
private:
|
||||
template <typename Type>
|
||||
bool shr_unsigned(Type& output) {
|
||||
if (start == finish) return false;
|
||||
CharT const minus = lcast_char_constants<CharT>::minus;
|
||||
CharT const plus = lcast_char_constants<CharT>::plus;
|
||||
bool const has_minus = Traits::eq(minus, *start);
|
||||
|
||||
/* We won`t use `start' any more, so no need in decrementing it after */
|
||||
if (has_minus || Traits::eq(plus, *start)) {
|
||||
++start;
|
||||
}
|
||||
|
||||
bool const succeed = lcast_ret_unsigned<Traits, Type, CharT>(output, start, finish).convert();
|
||||
|
||||
if (has_minus) {
|
||||
output = static_cast<Type>(0u - output);
|
||||
}
|
||||
|
||||
return succeed;
|
||||
}
|
||||
|
||||
template <typename Type>
|
||||
bool shr_signed(Type& output) {
|
||||
if (start == finish) return false;
|
||||
CharT const minus = lcast_char_constants<CharT>::minus;
|
||||
CharT const plus = lcast_char_constants<CharT>::plus;
|
||||
typedef BOOST_DEDUCED_TYPENAME make_unsigned<Type>::type utype;
|
||||
utype out_tmp = 0;
|
||||
bool const has_minus = Traits::eq(minus, *start);
|
||||
|
||||
/* We won`t use `start' any more, so no need in decrementing it after */
|
||||
if (has_minus || Traits::eq(plus, *start)) {
|
||||
++start;
|
||||
}
|
||||
|
||||
bool succeed = lcast_ret_unsigned<Traits, utype, CharT>(out_tmp, start, finish).convert();
|
||||
if (has_minus) {
|
||||
utype const comp_val = (static_cast<utype>(1) << std::numeric_limits<Type>::digits);
|
||||
succeed = succeed && out_tmp<=comp_val;
|
||||
output = static_cast<Type>(0u - out_tmp);
|
||||
} else {
|
||||
utype const comp_val = static_cast<utype>((std::numeric_limits<Type>::max)());
|
||||
succeed = succeed && out_tmp<=comp_val;
|
||||
output = static_cast<Type>(out_tmp);
|
||||
}
|
||||
return succeed;
|
||||
}
|
||||
|
||||
template<typename InputStreamable>
|
||||
bool shr_using_base_class(InputStreamable& output)
|
||||
{
|
||||
BOOST_STATIC_ASSERT_MSG(
|
||||
(!boost::is_pointer<InputStreamable>::value),
|
||||
"boost::lexical_cast can not convert to pointers"
|
||||
);
|
||||
|
||||
#if defined(BOOST_NO_STRINGSTREAM) || defined(BOOST_NO_STD_LOCALE)
|
||||
BOOST_STATIC_ASSERT_MSG((boost::is_same<char, CharT>::value),
|
||||
"boost::lexical_cast can not convert, because your STL library does not "
|
||||
"support such conversions. Try updating it."
|
||||
);
|
||||
#endif
|
||||
|
||||
#if defined(BOOST_NO_STRINGSTREAM)
|
||||
std::istrstream stream(start, finish - start);
|
||||
#else
|
||||
BOOST_DEDUCED_TYPENAME out_stream_helper_trait<CharT, Traits>::buffer_t buf;
|
||||
// Usually `istream` and `basic_istream` do not modify
|
||||
// content of buffer; `buffer_t` assures that this is true
|
||||
buf.setbuf(const_cast<CharT*>(start), finish - start);
|
||||
#if defined(BOOST_NO_STD_LOCALE)
|
||||
std::istream stream(&buf);
|
||||
#else
|
||||
std::basic_istream<CharT, Traits> stream(&buf);
|
||||
#endif // BOOST_NO_STD_LOCALE
|
||||
#endif // BOOST_NO_STRINGSTREAM
|
||||
|
||||
#ifndef BOOST_NO_EXCEPTIONS
|
||||
stream.exceptions(std::ios::badbit);
|
||||
try {
|
||||
#endif
|
||||
stream.unsetf(std::ios::skipws);
|
||||
lcast_set_precision(stream, static_cast<InputStreamable*>(0));
|
||||
|
||||
return (stream >> output)
|
||||
&& (stream.get() == Traits::eof());
|
||||
|
||||
#ifndef BOOST_NO_EXCEPTIONS
|
||||
} catch (const ::std::ios_base::failure& /*f*/) {
|
||||
return false;
|
||||
}
|
||||
#endif
|
||||
}
|
||||
|
||||
template<class T>
|
||||
inline bool shr_xchar(T& output) BOOST_NOEXCEPT {
|
||||
BOOST_STATIC_ASSERT_MSG(( sizeof(CharT) == sizeof(T) ),
|
||||
"boost::lexical_cast does not support narrowing of character types."
|
||||
"Use boost::locale instead" );
|
||||
bool const ok = (finish - start == 1);
|
||||
if (ok) {
|
||||
CharT out;
|
||||
Traits::assign(out, *start);
|
||||
output = static_cast<T>(out);
|
||||
}
|
||||
return ok;
|
||||
}
|
||||
|
||||
template <std::size_t N, class ArrayT>
|
||||
bool shr_std_array(ArrayT& output) BOOST_NOEXCEPT {
|
||||
using namespace std;
|
||||
const std::size_t size = static_cast<std::size_t>(finish - start);
|
||||
if (size > N - 1) { // `-1` because we need to store \0 at the end
|
||||
return false;
|
||||
}
|
||||
|
||||
memcpy(&output[0], start, size * sizeof(CharT));
|
||||
output[size] = Traits::to_char_type(0);
|
||||
return true;
|
||||
}
|
||||
|
||||
/************************************ OPERATORS >> ( ... ) ********************************/
|
||||
public:
|
||||
bool operator>>(unsigned short& output) { return shr_unsigned(output); }
|
||||
bool operator>>(unsigned int& output) { return shr_unsigned(output); }
|
||||
bool operator>>(unsigned long int& output) { return shr_unsigned(output); }
|
||||
bool operator>>(short& output) { return shr_signed(output); }
|
||||
bool operator>>(int& output) { return shr_signed(output); }
|
||||
bool operator>>(long int& output) { return shr_signed(output); }
|
||||
#if defined(BOOST_HAS_LONG_LONG)
|
||||
bool operator>>(boost::ulong_long_type& output) { return shr_unsigned(output); }
|
||||
bool operator>>(boost::long_long_type& output) { return shr_signed(output); }
|
||||
#elif defined(BOOST_HAS_MS_INT64)
|
||||
bool operator>>(unsigned __int64& output) { return shr_unsigned(output); }
|
||||
bool operator>>(__int64& output) { return shr_signed(output); }
|
||||
#endif
|
||||
|
||||
#ifdef BOOST_HAS_INT128
|
||||
bool operator>>(boost::uint128_type& output) { return shr_unsigned(output); }
|
||||
bool operator>>(boost::int128_type& output) { return shr_signed(output); }
|
||||
#endif
|
||||
|
||||
bool operator>>(char& output) { return shr_xchar(output); }
|
||||
bool operator>>(unsigned char& output) { return shr_xchar(output); }
|
||||
bool operator>>(signed char& output) { return shr_xchar(output); }
|
||||
#if !defined(BOOST_LCAST_NO_WCHAR_T) && !defined(BOOST_NO_INTRINSIC_WCHAR_T)
|
||||
bool operator>>(wchar_t& output) { return shr_xchar(output); }
|
||||
#endif
|
||||
#if !defined(BOOST_NO_CXX11_CHAR16_T) && !defined(BOOST_NO_CXX11_UNICODE_LITERALS)
|
||||
bool operator>>(char16_t& output) { return shr_xchar(output); }
|
||||
#endif
|
||||
#if !defined(BOOST_NO_CXX11_CHAR32_T) && !defined(BOOST_NO_CXX11_UNICODE_LITERALS)
|
||||
bool operator>>(char32_t& output) { return shr_xchar(output); }
|
||||
#endif
|
||||
template<class Alloc>
|
||||
bool operator>>(std::basic_string<CharT,Traits,Alloc>& str) {
|
||||
str.assign(start, finish); return true;
|
||||
}
|
||||
|
||||
template<class Alloc>
|
||||
bool operator>>(boost::container::basic_string<CharT,Traits,Alloc>& str) {
|
||||
str.assign(start, finish); return true;
|
||||
}
|
||||
|
||||
template <std::size_t N>
|
||||
bool operator>>(boost::array<CharT, N>& output) BOOST_NOEXCEPT {
|
||||
return shr_std_array<N>(output);
|
||||
}
|
||||
|
||||
template <std::size_t N>
|
||||
bool operator>>(boost::array<unsigned char, N>& output) BOOST_NOEXCEPT {
|
||||
return ((*this) >> reinterpret_cast<boost::array<char, N>& >(output));
|
||||
}
|
||||
|
||||
template <std::size_t N>
|
||||
bool operator>>(boost::array<signed char, N>& output) BOOST_NOEXCEPT {
|
||||
return ((*this) >> reinterpret_cast<boost::array<char, N>& >(output));
|
||||
}
|
||||
|
||||
#ifndef BOOST_NO_CXX11_HDR_ARRAY
|
||||
template <class C, std::size_t N>
|
||||
bool operator>>(std::array<C, N>& output) BOOST_NOEXCEPT {
|
||||
BOOST_STATIC_ASSERT_MSG(
|
||||
(sizeof(std::array<C, N>) == sizeof(boost::array<C, N>)),
|
||||
"std::array<C, N> and boost::array<C, N> must have exactly the same layout."
|
||||
);
|
||||
return ((*this) >> reinterpret_cast<boost::array<C, N>& >(output));
|
||||
}
|
||||
#endif
|
||||
|
||||
bool operator>>(bool& output) BOOST_NOEXCEPT {
|
||||
output = false; // Suppress warning about uninitalized variable
|
||||
|
||||
if (start == finish) return false;
|
||||
CharT const zero = lcast_char_constants<CharT>::zero;
|
||||
CharT const plus = lcast_char_constants<CharT>::plus;
|
||||
CharT const minus = lcast_char_constants<CharT>::minus;
|
||||
|
||||
const CharT* const dec_finish = finish - 1;
|
||||
output = Traits::eq(*dec_finish, zero + 1);
|
||||
if (!output && !Traits::eq(*dec_finish, zero)) {
|
||||
return false; // Does not ends on '0' or '1'
|
||||
}
|
||||
|
||||
if (start == dec_finish) return true;
|
||||
|
||||
// We may have sign at the beginning
|
||||
if (Traits::eq(plus, *start) || (Traits::eq(minus, *start) && !output)) {
|
||||
++ start;
|
||||
}
|
||||
|
||||
// Skipping zeros
|
||||
while (start != dec_finish) {
|
||||
if (!Traits::eq(zero, *start)) {
|
||||
return false; // Not a zero => error
|
||||
}
|
||||
|
||||
++ start;
|
||||
}
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
private:
|
||||
// Not optimised converter
|
||||
template <class T>
|
||||
bool float_types_converter_internal(T& output) {
|
||||
if (parse_inf_nan(start, finish, output)) return true;
|
||||
bool const return_value = shr_using_base_class(output);
|
||||
|
||||
/* Some compilers and libraries successfully
|
||||
* parse 'inf', 'INFINITY', '1.0E', '1.0E-'...
|
||||
* We are trying to provide a unified behaviour,
|
||||
* so we just forbid such conversions (as some
|
||||
* of the most popular compilers/libraries do)
|
||||
* */
|
||||
CharT const minus = lcast_char_constants<CharT>::minus;
|
||||
CharT const plus = lcast_char_constants<CharT>::plus;
|
||||
CharT const capital_e = lcast_char_constants<CharT>::capital_e;
|
||||
CharT const lowercase_e = lcast_char_constants<CharT>::lowercase_e;
|
||||
if ( return_value &&
|
||||
(
|
||||
Traits::eq(*(finish-1), lowercase_e) // 1.0e
|
||||
|| Traits::eq(*(finish-1), capital_e) // 1.0E
|
||||
|| Traits::eq(*(finish-1), minus) // 1.0e- or 1.0E-
|
||||
|| Traits::eq(*(finish-1), plus) // 1.0e+ or 1.0E+
|
||||
)
|
||||
) return false;
|
||||
|
||||
return return_value;
|
||||
}
|
||||
|
||||
public:
|
||||
bool operator>>(float& output) { return float_types_converter_internal(output); }
|
||||
bool operator>>(double& output) { return float_types_converter_internal(output); }
|
||||
bool operator>>(long double& output) { return float_types_converter_internal(output); }
|
||||
|
||||
// Generic istream-based algorithm.
|
||||
// lcast_streambuf_for_target<InputStreamable>::value is true.
|
||||
template <typename InputStreamable>
|
||||
bool operator>>(InputStreamable& output) {
|
||||
return shr_using_base_class(output);
|
||||
}
|
||||
};
|
||||
}
|
||||
} // namespace boost
|
||||
|
||||
#undef BOOST_LCAST_NO_WCHAR_T
|
||||
|
||||
#endif // BOOST_LEXICAL_CAST_DETAIL_CONVERTER_LEXICAL_HPP
|
||||
|
||||
Reference in New Issue
Block a user