601 lines
15 KiB
C++
601 lines
15 KiB
C++
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// tuple_io.hpp --------------------------------------------------------------
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// Copyright (C) 2001 Jaakko Jarvi (jaakko.jarvi@cs.utu.fi)
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// 2001 Gary Powell (gary.powell@sierra.com)
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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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// For more information, see http://www.boost.org
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// ----------------------------------------------------------------------------
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#ifndef BOOST_TUPLE_IO_HPP
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#define BOOST_TUPLE_IO_HPP
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// add to boost/config.hpp
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// for now
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# if defined __GNUC__
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# if (__GNUC__ == 2 && __GNUC_MINOR__ <= 97)
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#define BOOST_NO_TEMPLATED_STREAMS
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#endif
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#endif // __GNUC__
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#if defined BOOST_NO_TEMPLATED_STREAMS
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#include <iostream>
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#else
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#include <istream>
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#include <ostream>
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#endif
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#include <sstream>
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#include "boost/tuple/tuple.hpp"
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// This is ugly: one should be using twoargument isspace since whitspace can
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// be locale dependent, in theory at least.
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// not all libraries implement have the two-arg version, so we need to
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// use the one-arg one, which one should get with <cctype> but there seem
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// to be exceptions to this.
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#if !defined (BOOST_NO_STD_LOCALE)
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#include <locale> // for two-arg isspace
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#else
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#include <cctype> // for one-arg (old) isspace
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#include <ctype.h> // Metrowerks does not find one-arg isspace from cctype
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#endif
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namespace boost {
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namespace tuples {
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namespace detail {
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class format_info {
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public:
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enum manipulator_type { open, close, delimiter };
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BOOST_STATIC_CONSTANT(int, number_of_manipulators = delimiter + 1);
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private:
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static int get_stream_index (int m)
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{
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static const int stream_index[number_of_manipulators]
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= { std::ios::xalloc(), std::ios::xalloc(), std::ios::xalloc() };
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return stream_index[m];
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}
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format_info(const format_info&);
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format_info();
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public:
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#if defined (BOOST_NO_TEMPLATED_STREAMS)
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static char get_manipulator(std::ios& i, manipulator_type m) {
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char c = static_cast<char>(i.iword(get_stream_index(m)));
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// parentheses and space are the default manipulators
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if (!c) {
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switch(m) {
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case detail::format_info::open : c = '('; break;
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case detail::format_info::close : c = ')'; break;
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case detail::format_info::delimiter : c = ' '; break;
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}
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}
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return c;
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}
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static void set_manipulator(std::ios& i, manipulator_type m, char c) {
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i.iword(get_stream_index(m)) = static_cast<long>(c);
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}
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#else
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template<class CharType, class CharTrait>
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static CharType get_manipulator(std::basic_ios<CharType, CharTrait>& i,
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manipulator_type m) {
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// The manipulators are stored as long.
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// A valid instanitation of basic_stream allows CharType to be any POD,
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// hence, the static_cast may fail (it fails if long is not convertible
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// to CharType
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CharType c = static_cast<CharType>(i.iword(get_stream_index(m)) );
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// parentheses and space are the default manipulators
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if (!c) {
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switch(m) {
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case detail::format_info::open : c = i.widen('('); break;
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case detail::format_info::close : c = i.widen(')'); break;
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case detail::format_info::delimiter : c = i.widen(' '); break;
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}
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}
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return c;
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}
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template<class CharType, class CharTrait>
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static void set_manipulator(std::basic_ios<CharType, CharTrait>& i,
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manipulator_type m, CharType c) {
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// The manipulators are stored as long.
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// A valid instanitation of basic_stream allows CharType to be any POD,
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// hence, the static_cast may fail (it fails if CharType is not
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// convertible long.
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i.iword(get_stream_index(m)) = static_cast<long>(c);
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}
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#endif // BOOST_NO_TEMPLATED_STREAMS
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};
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} // end of namespace detail
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template<class CharType>
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class tuple_manipulator {
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const detail::format_info::manipulator_type mt;
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CharType f_c;
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public:
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explicit tuple_manipulator(detail::format_info::manipulator_type m,
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const char c = 0)
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: mt(m), f_c(c) {}
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#if defined (BOOST_NO_TEMPLATED_STREAMS)
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void set(std::ios &io) const {
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detail::format_info::set_manipulator(io, mt, f_c);
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}
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#else
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#if defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
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template<class CharType2, class CharTrait>
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void set(std::basic_ios<CharType2, CharTrait> &io) const {
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detail::format_info::set_manipulator(io, mt, f_c);
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}
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#else
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template<class CharTrait>
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void set(std::basic_ios<CharType, CharTrait> &io) const {
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detail::format_info::set_manipulator(io, mt, f_c);
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}
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#endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
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#endif // BOOST_NO_TEMPLATED_STREAMS
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};
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#if defined (BOOST_NO_TEMPLATED_STREAMS)
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inline std::ostream&
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operator<<(std::ostream& o, const tuple_manipulator<char>& m) {
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m.set(o);
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return o;
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}
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inline std::istream&
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operator>>(std::istream& i, const tuple_manipulator<char>& m) {
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m.set(i);
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return i;
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}
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#else
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template<class CharType, class CharTrait>
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inline std::basic_ostream<CharType, CharTrait>&
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operator<<(std::basic_ostream<CharType, CharTrait>& o, const tuple_manipulator<CharType>& m) {
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m.set(o);
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return o;
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}
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template<class CharType, class CharTrait>
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inline std::basic_istream<CharType, CharTrait>&
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operator>>(std::basic_istream<CharType, CharTrait>& i, const tuple_manipulator<CharType>& m) {
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m.set(i);
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return i;
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}
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#endif // BOOST_NO_TEMPLATED_STREAMS
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template<class CharType>
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inline tuple_manipulator<CharType> set_open(const CharType c) {
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return tuple_manipulator<CharType>(detail::format_info::open, c);
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}
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template<class CharType>
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inline tuple_manipulator<CharType> set_close(const CharType c) {
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return tuple_manipulator<CharType>(detail::format_info::close, c);
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}
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template<class CharType>
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inline tuple_manipulator<CharType> set_delimiter(const CharType c) {
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return tuple_manipulator<CharType>(detail::format_info::delimiter, c);
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}
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// -------------------------------------------------------------
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// printing tuples to ostream in format (a b c)
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// parentheses and space are defaults, but can be overriden with manipulators
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// set_open, set_close and set_delimiter
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namespace detail {
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// Note: The order of the print functions is critical
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// to let a conforming compiler find and select the correct one.
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#if defined (BOOST_NO_TEMPLATED_STREAMS)
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#if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
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template<class T1>
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inline std::ostream& print(std::ostream& o, const cons<T1, null_type>& t) {
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return o << t.head;
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}
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#endif // BOOST_NO_TEMPLATED_STREAMS
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inline std::ostream& print(std::ostream& o, const null_type&) { return o; }
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template<class T1, class T2>
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inline std::ostream&
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print(std::ostream& o, const cons<T1, T2>& t) {
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const char d = format_info::get_manipulator(o, format_info::delimiter);
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o << t.head;
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#if defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
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if (tuples::length<T2>::value == 0)
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return o;
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#endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
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o << d;
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return print(o, t.tail );
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}
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template<class T>
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inline bool handle_width(std::ostream& o, const T& t) {
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std::streamsize width = o.width();
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if(width == 0) return false;
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std::ostringstream ss;
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ss.copyfmt(o);
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ss.tie(0);
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ss.width(0);
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ss << t;
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o << ss.str();
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return true;
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}
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#else
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#if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
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template<class CharType, class CharTrait, class T1>
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inline std::basic_ostream<CharType, CharTrait>&
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print(std::basic_ostream<CharType, CharTrait>& o, const cons<T1, null_type>& t) {
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return o << t.head;
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}
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#endif // !BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
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template<class CharType, class CharTrait>
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inline std::basic_ostream<CharType, CharTrait>&
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print(std::basic_ostream<CharType, CharTrait>& o, const null_type&) {
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return o;
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}
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template<class CharType, class CharTrait, class T1, class T2>
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inline std::basic_ostream<CharType, CharTrait>&
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print(std::basic_ostream<CharType, CharTrait>& o, const cons<T1, T2>& t) {
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const CharType d = format_info::get_manipulator(o, format_info::delimiter);
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o << t.head;
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#if defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
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if (tuples::length<T2>::value == 0)
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return o;
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#endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
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o << d;
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return print(o, t.tail);
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}
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template<class CharT, class Traits, class T>
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inline bool handle_width(std::basic_ostream<CharT, Traits>& o, const T& t) {
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std::streamsize width = o.width();
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if(width == 0) return false;
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std::basic_ostringstream<CharT, Traits> ss;
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ss.copyfmt(o);
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ss.tie(0);
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ss.width(0);
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ss << t;
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o << ss.str();
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return true;
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}
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#endif // BOOST_NO_TEMPLATED_STREAMS
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} // namespace detail
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#if defined (BOOST_NO_TEMPLATED_STREAMS)
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inline std::ostream& operator<<(std::ostream& o, const null_type& t) {
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if (!o.good() ) return o;
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if (detail::handle_width(o, t)) return o;
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const char l =
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detail::format_info::get_manipulator(o, detail::format_info::open);
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const char r =
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detail::format_info::get_manipulator(o, detail::format_info::close);
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o << l;
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o << r;
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return o;
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}
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template<class T1, class T2>
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inline std::ostream& operator<<(std::ostream& o, const cons<T1, T2>& t) {
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if (!o.good() ) return o;
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if (detail::handle_width(o, t)) return o;
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const char l =
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detail::format_info::get_manipulator(o, detail::format_info::open);
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const char r =
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detail::format_info::get_manipulator(o, detail::format_info::close);
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o << l;
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detail::print(o, t);
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o << r;
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return o;
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}
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#else
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template<class CharType, class CharTrait>
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inline std::basic_ostream<CharType, CharTrait>&
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operator<<(std::basic_ostream<CharType, CharTrait>& o,
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const null_type& t) {
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if (!o.good() ) return o;
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if (detail::handle_width(o, t)) return o;
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const CharType l =
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detail::format_info::get_manipulator(o, detail::format_info::open);
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const CharType r =
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detail::format_info::get_manipulator(o, detail::format_info::close);
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o << l;
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o << r;
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return o;
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}
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template<class CharType, class CharTrait, class T1, class T2>
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inline std::basic_ostream<CharType, CharTrait>&
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operator<<(std::basic_ostream<CharType, CharTrait>& o,
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const cons<T1, T2>& t) {
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if (!o.good() ) return o;
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if (detail::handle_width(o, t)) return o;
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const CharType l =
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detail::format_info::get_manipulator(o, detail::format_info::open);
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const CharType r =
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detail::format_info::get_manipulator(o, detail::format_info::close);
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o << l;
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detail::print(o, t);
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o << r;
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return o;
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}
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#endif // BOOST_NO_TEMPLATED_STREAMS
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// -------------------------------------------------------------
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// input stream operators
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namespace detail {
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#if defined (BOOST_NO_TEMPLATED_STREAMS)
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inline std::istream&
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extract_and_check_delimiter(
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std::istream& is, format_info::manipulator_type del)
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{
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const char d = format_info::get_manipulator(is, del);
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#if defined (BOOST_NO_STD_LOCALE)
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const bool is_delimiter = !isspace(d);
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#else
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const bool is_delimiter = (!std::isspace(d, is.getloc()) );
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#endif
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char c;
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if (is_delimiter) {
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is >> c;
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if (is.good() && c!=d) {
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is.setstate(std::ios::failbit);
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}
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} else {
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is >> std::ws;
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}
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return is;
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}
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// Note: The order of the read functions is critical to let a
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// (conforming?) compiler find and select the correct one.
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#if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
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template<class T1>
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inline std::istream &
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read (std::istream &is, cons<T1, null_type>& t1) {
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if (!is.good()) return is;
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return is >> t1.head ;
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}
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#else
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inline std::istream& read(std::istream& i, const null_type&) { return i; }
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#endif // !BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
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|
||
|
template<class T1, class T2>
|
||
|
inline std::istream&
|
||
|
read(std::istream &is, cons<T1, T2>& t1) {
|
||
|
|
||
|
if (!is.good()) return is;
|
||
|
|
||
|
is >> t1.head;
|
||
|
|
||
|
#if defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
|
||
|
if (tuples::length<T2>::value == 0)
|
||
|
return is;
|
||
|
#endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
|
||
|
|
||
|
extract_and_check_delimiter(is, format_info::delimiter);
|
||
|
|
||
|
return read(is, t1.tail);
|
||
|
}
|
||
|
|
||
|
} // end namespace detail
|
||
|
|
||
|
inline std::istream&
|
||
|
operator>>(std::istream &is, null_type&) {
|
||
|
|
||
|
if (!is.good() ) return is;
|
||
|
|
||
|
detail::extract_and_check_delimiter(is, detail::format_info::open);
|
||
|
detail::extract_and_check_delimiter(is, detail::format_info::close);
|
||
|
|
||
|
return is;
|
||
|
}
|
||
|
|
||
|
|
||
|
template<class T1, class T2>
|
||
|
inline std::istream&
|
||
|
operator>>(std::istream& is, cons<T1, T2>& t1) {
|
||
|
|
||
|
if (!is.good() ) return is;
|
||
|
|
||
|
detail::extract_and_check_delimiter(is, detail::format_info::open);
|
||
|
|
||
|
detail::read(is, t1);
|
||
|
|
||
|
detail::extract_and_check_delimiter(is, detail::format_info::close);
|
||
|
|
||
|
return is;
|
||
|
}
|
||
|
|
||
|
|
||
|
|
||
|
#else
|
||
|
|
||
|
template<class CharType, class CharTrait>
|
||
|
inline std::basic_istream<CharType, CharTrait>&
|
||
|
extract_and_check_delimiter(
|
||
|
std::basic_istream<CharType, CharTrait> &is, format_info::manipulator_type del)
|
||
|
{
|
||
|
const CharType d = format_info::get_manipulator(is, del);
|
||
|
|
||
|
#if defined (BOOST_NO_STD_LOCALE)
|
||
|
const bool is_delimiter = !isspace(d);
|
||
|
#elif defined ( __BORLANDC__ )
|
||
|
const bool is_delimiter = !std::use_facet< std::ctype< CharType > >
|
||
|
(is.getloc() ).is( std::ctype_base::space, d);
|
||
|
#else
|
||
|
const bool is_delimiter = (!std::isspace(d, is.getloc()) );
|
||
|
#endif
|
||
|
|
||
|
CharType c;
|
||
|
if (is_delimiter) {
|
||
|
is >> c;
|
||
|
if (is.good() && c!=d) {
|
||
|
is.setstate(std::ios::failbit);
|
||
|
}
|
||
|
} else {
|
||
|
is >> std::ws;
|
||
|
}
|
||
|
return is;
|
||
|
}
|
||
|
|
||
|
|
||
|
#if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
|
||
|
template<class CharType, class CharTrait, class T1>
|
||
|
inline std::basic_istream<CharType, CharTrait> &
|
||
|
read (std::basic_istream<CharType, CharTrait> &is, cons<T1, null_type>& t1) {
|
||
|
|
||
|
if (!is.good()) return is;
|
||
|
|
||
|
return is >> t1.head;
|
||
|
}
|
||
|
#else
|
||
|
template<class CharType, class CharTrait>
|
||
|
inline std::basic_istream<CharType, CharTrait>&
|
||
|
read(std::basic_istream<CharType, CharTrait>& i, const null_type&) { return i; }
|
||
|
|
||
|
#endif // !BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
|
||
|
|
||
|
template<class CharType, class CharTrait, class T1, class T2>
|
||
|
inline std::basic_istream<CharType, CharTrait>&
|
||
|
read(std::basic_istream<CharType, CharTrait> &is, cons<T1, T2>& t1) {
|
||
|
|
||
|
if (!is.good()) return is;
|
||
|
|
||
|
is >> t1.head;
|
||
|
|
||
|
#if defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
|
||
|
if (tuples::length<T2>::value == 0)
|
||
|
return is;
|
||
|
#endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
|
||
|
|
||
|
extract_and_check_delimiter(is, format_info::delimiter);
|
||
|
|
||
|
return read(is, t1.tail);
|
||
|
}
|
||
|
|
||
|
} // end namespace detail
|
||
|
|
||
|
|
||
|
template<class CharType, class CharTrait>
|
||
|
inline std::basic_istream<CharType, CharTrait>&
|
||
|
operator>>(std::basic_istream<CharType, CharTrait> &is, null_type&) {
|
||
|
|
||
|
if (!is.good() ) return is;
|
||
|
|
||
|
detail::extract_and_check_delimiter(is, detail::format_info::open);
|
||
|
detail::extract_and_check_delimiter(is, detail::format_info::close);
|
||
|
|
||
|
return is;
|
||
|
}
|
||
|
|
||
|
template<class CharType, class CharTrait, class T1, class T2>
|
||
|
inline std::basic_istream<CharType, CharTrait>&
|
||
|
operator>>(std::basic_istream<CharType, CharTrait>& is, cons<T1, T2>& t1) {
|
||
|
|
||
|
if (!is.good() ) return is;
|
||
|
|
||
|
detail::extract_and_check_delimiter(is, detail::format_info::open);
|
||
|
|
||
|
detail::read(is, t1);
|
||
|
|
||
|
detail::extract_and_check_delimiter(is, detail::format_info::close);
|
||
|
|
||
|
return is;
|
||
|
}
|
||
|
|
||
|
#endif // BOOST_NO_TEMPLATED_STREAMS
|
||
|
|
||
|
} // end of namespace tuples
|
||
|
} // end of namespace boost
|
||
|
|
||
|
#endif // BOOST_TUPLE_IO_HPP
|
||
|
|
||
|
|