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tribool_io.hpp - Hosted on DriveHQ Cloud IT Platform
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Ruta de la carpeta: \\game3dprogramming\materials\GameFactory\GameFactoryDemo\references\boost_1_35_0\boost\logic\tribool_io.hpp
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// Three-state boolean logic library // Copyright Douglas Gregor 2002-2004. Use, modification and // distribution is 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) #ifndef BOOST_LOGIC_TRIBOOL_IO_HPP #define BOOST_LOGIC_TRIBOOL_IO_HPP #include
#include
#include
#if BOOST_WORKAROUND(_MSC_VER, >= 1200) # pragma once #endif #ifndef BOOST_NO_STD_LOCALE # include
#endif #include
#include
namespace boost { namespace logic { #ifdef BOOST_NO_STD_LOCALE /** * \brief Returns a string containing the default name for the \c * false value of a tribool with the given character type T. * * This function only exists when the C++ standard library * implementation does not support locales. */ template
std::basic_string
default_false_name(); /** * \brief Returns the character string "false". * * This function only exists when the C++ standard library * implementation does not support locales. */ template<> inline std::basic_string
default_false_name
() { return "false"; } # ifndef BOOST_NO_WCHAR_T /** * \brief Returns the wide character string L"false". * * This function only exists when the C++ standard library * implementation does not support locales. */ template<> inline std::basic_string
default_false_name
() { return L"false"; } # endif /** * \brief Returns a string containing the default name for the \c true * value of a tribool with the given character type T. * * This function only exists when the C++ standard library * implementation does not support locales. */ template
std::basic_string
default_true_name(); /** * \brief Returns the character string "true". * * This function only exists when the C++ standard library * implementation does not support locales. */ template<> inline std::basic_string
default_true_name
() { return "true"; } # ifndef BOOST_NO_WCHAR_T /** * \brief Returns the wide character string L"true". * * This function only exists * when the C++ standard library * implementation does not support * locales. */ template<> inline std::basic_string
default_true_name
() { return L"true"; } # endif #endif /** * \brief Returns a string containing the default name for the indeterminate * value of a tribool with the given character type T. * * This routine is used by the input and output streaming operators * for tribool when there is no locale support or the stream's locale * does not contain the indeterminate_name facet. */ template
std::basic_string
get_default_indeterminate_name(); /// Returns the character string "indeterminate". template<> inline std::basic_string
get_default_indeterminate_name
() { return "indeterminate"; } #if BOOST_WORKAROUND(BOOST_MSVC, < 1300) // VC++ 6.0 chokes on the specialization below, so we're stuck without // wchar_t support. What a pain. TODO: it might just need a the template // parameter as function parameter... #else # ifndef BOOST_NO_WCHAR_T /// Returns the wide character string L"indeterminate". template<> inline std::basic_string
get_default_indeterminate_name
() { return L"indeterminate"; } # endif #endif // http://www.cantrip.org/locale.html #ifndef BOOST_NO_STD_LOCALE /** * \brief A locale facet specifying the name of the indeterminate * value of a tribool. * * The facet is used to perform I/O on tribool values when \c * std::boolalpha has been specified. This class template is only * available if the C++ standard library implementation supports * locales. */ template
class indeterminate_name : public std::locale::facet, private boost::noncopyable { public: typedef CharT char_type; typedef std::basic_string
string_type; /// Construct the facet with the default name indeterminate_name() : name_(get_default_indeterminate_name
()) {} /// Construct the facet with the given name for the indeterminate value explicit indeterminate_name(const string_type& name) : name_(name) {} /// Returns the name for the indeterminate value string_type name() const { return name_; } /// Uniquily identifies this facet with the locale. static std::locale::id id; private: string_type name_; }; template
std::locale::id indeterminate_name
::id; #endif /** * \brief Writes the value of a tribool to a stream. * * When the value of @p x is either \c true or \c false, this routine * is semantically equivalent to: * \code out << static_cast
(x); \endcode * * When @p x has an indeterminate value, it outputs either the integer * value 2 (if
(out.flags() & std::ios_base::boolalpha) == 0
) * or the name of the indeterminate value. The name of the * indeterminate value comes from the indeterminate_name facet (if it * is defined in the output stream's locale), or from the * get_default_indeterminate_name function (if it is not defined in the * locale or if the C++ standard library implementation does not * support locales). * * \returns @p out */ template
inline std::basic_ostream
& operator<<(std::basic_ostream
& out, tribool x) { if (!indeterminate(x)) { out << static_cast
(x); } else { typename std::basic_ostream
::sentry cerberus(out); if (cerberus) { if (out.flags() & std::ios_base::boolalpha) { #ifndef BOOST_NO_STD_LOCALE if (BOOST_HAS_FACET(indeterminate_name
, out.getloc())) { const indeterminate_name
& facet = BOOST_USE_FACET(indeterminate_name
, out.getloc()); out << facet.name(); } else { out << get_default_indeterminate_name
(); } #else out << get_default_indeterminate_name
(); #endif } else out << 2; } } return out; } /** * \brief Writes the indeterminate tribool value to a stream. * * This routine outputs either the integer * value 2 (if
(out.flags() & std::ios_base::boolalpha) == 0
) * or the name of the indeterminate value. The name of the * indeterminate value comes from the indeterminate_name facet (if it * is defined in the output stream's locale), or from the * get_default_indeterminate_name function (if it is not defined in the * locale or if the C++ standard library implementation does not * support locales). * * \returns @p out */ template
inline std::basic_ostream
& operator<<(std::basic_ostream
& out, bool (*)(tribool, detail::indeterminate_t)) { return out << tribool(indeterminate); } /** * \brief Reads a tribool value from a stream. * * When
(out.flags() & std::ios_base::boolalpha) == 0
, this * function reads a \c long value from the input stream @p in and * converts that value to a tribool. If that value is 0, @p x becomes * \c false; if it is 1, @p x becomes \c true; if it is 2, @p becomes * \c indetermine; otherwise, the operation fails (and the fail bit is * set on the input stream @p in). * * When
(out.flags() & std::ios_base::boolalpha) != 0
, this * function first determines the names of the false, true, and * indeterminate values. The false and true names are extracted from * the \c std::numpunct facet of the input stream's locale (if the C++ * standard library implementation supports locales), or from the \c * default_false_name and \c default_true_name functions (if there is * no locale support). The indeterminate name is extracted from the * appropriate \c indeterminate_name facet (if it is available in the * input stream's locale), or from the \c get_default_indeterminate_name * function (if the C++ standard library implementation does not * support locales, or the \c indeterminate_name facet is not * specified for this locale object). The input is then matched to * each of these names, and the tribool @p x is assigned the value * corresponding to the longest name that matched. If no name is * matched or all names are empty, the operation fails (and the fail * bit is set on the input stream @p in). * * \returns @p in */ template
inline std::basic_istream
& operator>>(std::basic_istream
& in, tribool& x) { if (in.flags() & std::ios_base::boolalpha) { typename std::basic_istream
::sentry cerberus(in); if (cerberus) { typedef std::basic_string
string_type; #ifndef BOOST_NO_STD_LOCALE const std::numpunct
& numpunct_facet = BOOST_USE_FACET(std::numpunct
, in.getloc()); string_type falsename = numpunct_facet.falsename(); string_type truename = numpunct_facet.truename(); string_type othername; if (BOOST_HAS_FACET(indeterminate_name
, in.getloc())) { othername = BOOST_USE_FACET(indeterminate_name
, in.getloc()).name(); } else { othername = get_default_indeterminate_name
(); } #else string_type falsename = default_false_name
(); string_type truename = default_true_name
(); string_type othername = get_default_indeterminate_name
(); #endif typename string_type::size_type pos = 0; bool falsename_ok = true, truename_ok = true, othername_ok = true; // Modeled after the code from Library DR 17 while (falsename_ok && pos < falsename.size() || truename_ok && pos < truename.size() || othername_ok && pos < othername.size()) { typename Traits::int_type c = in.get(); if (c == Traits::eof()) return in; bool matched = false; if (falsename_ok && pos < falsename.size()) { if (Traits::eq(Traits::to_char_type(c), falsename[pos])) matched = true; else falsename_ok = false; } if (truename_ok && pos < truename.size()) { if (Traits::eq(Traits::to_char_type(c), truename[pos])) matched = true; else truename_ok = false; } if (othername_ok && pos < othername.size()) { if (Traits::eq(Traits::to_char_type(c), othername[pos])) matched = true; else othername_ok = false; } if (matched) { ++pos; } if (pos > falsename.size()) falsename_ok = false; if (pos > truename.size()) truename_ok = false; if (pos > othername.size()) othername_ok = false; } if (pos == 0) in.setstate(std::ios_base::failbit); else { if (falsename_ok) x = false; else if (truename_ok) x = true; else if (othername_ok) x = indeterminate; else in.setstate(std::ios_base::failbit); } } } else { long value; if (in >> value) { switch (value) { case 0: x = false; break; case 1: x = true; break; case 2: x = indeterminate; break; default: in.setstate(std::ios_base::failbit); break; } } } return in; } } } // end namespace boost::logic #endif // BOOST_LOGIC_TRIBOOL_IO_HPP
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