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PK �K�[ ��6 6 tribool.hppnu �[��� // 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) // For more information, see http://www.boost.org #ifndef BOOST_LOGIC_TRIBOOL_HPP #define BOOST_LOGIC_TRIBOOL_HPP #include <boost/logic/tribool_fwd.hpp> #include <boost/config.hpp> #include <boost/detail/workaround.hpp> #ifdef BOOST_HAS_PRAGMA_ONCE # pragma once #endif namespace boost { namespace logic { /// INTERNAL ONLY namespace detail { /** * INTERNAL ONLY * * \brief A type used only to uniquely identify the 'indeterminate' * function/keyword. */ struct indeterminate_t { #if BOOST_WORKAROUND(BOOST_BORLANDC, < 0x0600) char dummy_; // BCB would use 8 bytes by default #endif }; } // end namespace detail /** * INTERNAL ONLY * The type of the 'indeterminate' keyword. This has the same type as the * function 'indeterminate' so that we can recognize when the keyword is * used. */ typedef bool (*indeterminate_keyword_t)(tribool, detail::indeterminate_t); /** * \brief Keyword and test function for the indeterminate tribool value * * The \c indeterminate function has a dual role. It's first role is * as a unary function that tells whether the tribool value is in the * "indeterminate" state. It's second role is as a keyword * representing the indeterminate (just like "true" and "false" * represent the true and false states). If you do not like the name * "indeterminate", and would prefer to use a different name, see the * macro \c BOOST_TRIBOOL_THIRD_STATE. * * \returns <tt>x.value == tribool::indeterminate_value</tt> * \throws nothrow */ BOOST_CONSTEXPR inline bool indeterminate(tribool x, detail::indeterminate_t dummy = detail::indeterminate_t()) BOOST_NOEXCEPT; /** * \brief A 3-state boolean type. * * 3-state boolean values are either true, false, or * indeterminate. */ class tribool { #if defined( BOOST_NO_CXX11_EXPLICIT_CONVERSION_OPERATORS ) private: /// INTERNAL ONLY struct dummy { void nonnull() {}; }; typedef void (dummy::*safe_bool)(); #endif public: /** * Construct a new 3-state boolean value with the value 'false'. * * \throws nothrow */ BOOST_CONSTEXPR tribool() BOOST_NOEXCEPT : value(false_value) {} /** * Construct a new 3-state boolean value with the given boolean * value, which may be \c true or \c false. * * \throws nothrow */ BOOST_CONSTEXPR tribool(bool initial_value) BOOST_NOEXCEPT : value(initial_value? true_value : false_value) {} /** * Construct a new 3-state boolean value with an indeterminate value. * * \throws nothrow */ BOOST_CONSTEXPR tribool(indeterminate_keyword_t) BOOST_NOEXCEPT : value(indeterminate_value) {} /** * Use a 3-state boolean in a boolean context. Will evaluate true in a * boolean context only when the 3-state boolean is definitely true. * * \returns true if the 3-state boolean is true, false otherwise * \throws nothrow */ #if !defined( BOOST_NO_CXX11_EXPLICIT_CONVERSION_OPERATORS ) BOOST_CONSTEXPR explicit operator bool () const BOOST_NOEXCEPT { return value == true_value; } #else BOOST_CONSTEXPR operator safe_bool() const BOOST_NOEXCEPT { return value == true_value? &dummy::nonnull : 0; } #endif /** * The actual stored value in this 3-state boolean, which may be false, true, * or indeterminate. */ enum value_t { false_value, true_value, indeterminate_value } value; }; // Check if the given tribool has an indeterminate value. Also doubles as a // keyword for the 'indeterminate' value BOOST_CONSTEXPR inline bool indeterminate(tribool x, detail::indeterminate_t) BOOST_NOEXCEPT { return x.value == tribool::indeterminate_value; } /** @defgroup logical Logical operations */ //@{ /** * \brief Computes the logical negation of a tribool * * \returns the logical negation of the tribool, according to the * table: * <table border=1> * <tr> * <th><center><code>!</code></center></th> * <th/> * </tr> * <tr> * <th><center>false</center></th> * <td><center>true</center></td> * </tr> * <tr> * <th><center>true</center></th> * <td><center>false</center></td> * </tr> * <tr> * <th><center>indeterminate</center></th> * <td><center>indeterminate</center></td> * </tr> * </table> * \throws nothrow */ BOOST_CONSTEXPR inline tribool operator!(tribool x) BOOST_NOEXCEPT { return x.value == tribool::false_value? tribool(true) :x.value == tribool::true_value? tribool(false) :tribool(indeterminate); } /** * \brief Computes the logical conjunction of two tribools * * \returns the result of logically ANDing the two tribool values, * according to the following table: * <table border=1> * <tr> * <th><center><code>&&</code></center></th> * <th><center>false</center></th> * <th><center>true</center></th> * <th><center>indeterminate</center></th> * </tr> * <tr> * <th><center>false</center></th> * <td><center>false</center></td> * <td><center>false</center></td> * <td><center>false</center></td> * </tr> * <tr> * <th><center>true</center></th> * <td><center>false</center></td> * <td><center>true</center></td> * <td><center>indeterminate</center></td> * </tr> * <tr> * <th><center>indeterminate</center></th> * <td><center>false</center></td> * <td><center>indeterminate</center></td> * <td><center>indeterminate</center></td> * </tr> * </table> * \throws nothrow */ BOOST_CONSTEXPR inline tribool operator&&(tribool x, tribool y) BOOST_NOEXCEPT { return (static_cast<bool>(!x) || static_cast<bool>(!y)) ? tribool(false) : ((static_cast<bool>(x) && static_cast<bool>(y)) ? tribool(true) : indeterminate) ; } /** * \overload */ BOOST_CONSTEXPR inline tribool operator&&(tribool x, bool y) BOOST_NOEXCEPT { return y? x : tribool(false); } /** * \overload */ BOOST_CONSTEXPR inline tribool operator&&(bool x, tribool y) BOOST_NOEXCEPT { return x? y : tribool(false); } /** * \overload */ BOOST_CONSTEXPR inline tribool operator&&(indeterminate_keyword_t, tribool x) BOOST_NOEXCEPT { return !x? tribool(false) : tribool(indeterminate); } /** * \overload */ BOOST_CONSTEXPR inline tribool operator&&(tribool x, indeterminate_keyword_t) BOOST_NOEXCEPT { return !x? tribool(false) : tribool(indeterminate); } /** * \brief Computes the logical disjunction of two tribools * * \returns the result of logically ORing the two tribool values, * according to the following table: * <table border=1> * <tr> * <th><center><code>||</code></center></th> * <th><center>false</center></th> * <th><center>true</center></th> * <th><center>indeterminate</center></th> * </tr> * <tr> * <th><center>false</center></th> * <td><center>false</center></td> * <td><center>true</center></td> * <td><center>indeterminate</center></td> * </tr> * <tr> * <th><center>true</center></th> * <td><center>true</center></td> * <td><center>true</center></td> * <td><center>true</center></td> * </tr> * <tr> * <th><center>indeterminate</center></th> * <td><center>indeterminate</center></td> * <td><center>true</center></td> * <td><center>indeterminate</center></td> * </tr> * </table> * \throws nothrow */ BOOST_CONSTEXPR inline tribool operator||(tribool x, tribool y) BOOST_NOEXCEPT { return (static_cast<bool>(!x) && static_cast<bool>(!y)) ? tribool(false) : ((static_cast<bool>(x) || static_cast<bool>(y)) ? tribool(true) : tribool(indeterminate)) ; } /** * \overload */ BOOST_CONSTEXPR inline tribool operator||(tribool x, bool y) BOOST_NOEXCEPT { return y? tribool(true) : x; } /** * \overload */ BOOST_CONSTEXPR inline tribool operator||(bool x, tribool y) BOOST_NOEXCEPT { return x? tribool(true) : y; } /** * \overload */ BOOST_CONSTEXPR inline tribool operator||(indeterminate_keyword_t, tribool x) BOOST_NOEXCEPT { return x? tribool(true) : tribool(indeterminate); } /** * \overload */ BOOST_CONSTEXPR inline tribool operator||(tribool x, indeterminate_keyword_t) BOOST_NOEXCEPT { return x? tribool(true) : tribool(indeterminate); } //@} /** * \brief Compare tribools for equality * * \returns the result of comparing two tribool values, according to * the following table: * <table border=1> * <tr> * <th><center><code>==</code></center></th> * <th><center>false</center></th> * <th><center>true</center></th> * <th><center>indeterminate</center></th> * </tr> * <tr> * <th><center>false</center></th> * <td><center>true</center></td> * <td><center>false</center></td> * <td><center>indeterminate</center></td> * </tr> * <tr> * <th><center>true</center></th> * <td><center>false</center></td> * <td><center>true</center></td> * <td><center>indeterminate</center></td> * </tr> * <tr> * <th><center>indeterminate</center></th> * <td><center>indeterminate</center></td> * <td><center>indeterminate</center></td> * <td><center>indeterminate</center></td> * </tr> * </table> * \throws nothrow */ BOOST_CONSTEXPR inline tribool operator==(tribool x, tribool y) BOOST_NOEXCEPT { return (indeterminate(x) || indeterminate(y)) ? indeterminate : ((x && y) || (!x && !y)) ; } /** * \overload */ BOOST_CONSTEXPR inline tribool operator==(tribool x, bool y) BOOST_NOEXCEPT { return x == tribool(y); } /** * \overload */ BOOST_CONSTEXPR inline tribool operator==(bool x, tribool y) BOOST_NOEXCEPT { return tribool(x) == y; } /** * \overload */ BOOST_CONSTEXPR inline tribool operator==(indeterminate_keyword_t, tribool x) BOOST_NOEXCEPT { return tribool(indeterminate) == x; } /** * \overload */ BOOST_CONSTEXPR inline tribool operator==(tribool x, indeterminate_keyword_t) BOOST_NOEXCEPT { return tribool(indeterminate) == x; } /** * \brief Compare tribools for inequality * * \returns the result of comparing two tribool values for inequality, * according to the following table: * <table border=1> * <tr> * <th><center><code>!=</code></center></th> * <th><center>false</center></th> * <th><center>true</center></th> * <th><center>indeterminate</center></th> * </tr> * <tr> * <th><center>false</center></th> * <td><center>false</center></td> * <td><center>true</center></td> * <td><center>indeterminate</center></td> * </tr> * <tr> * <th><center>true</center></th> * <td><center>true</center></td> * <td><center>false</center></td> * <td><center>indeterminate</center></td> * </tr> * <tr> * <th><center>indeterminate</center></th> * <td><center>indeterminate</center></td> * <td><center>indeterminate</center></td> * <td><center>indeterminate</center></td> * </tr> * </table> * \throws nothrow */ BOOST_CONSTEXPR inline tribool operator!=(tribool x, tribool y) BOOST_NOEXCEPT { return (indeterminate(x) || indeterminate(y)) ? indeterminate : !((x && y) || (!x && !y)) ; } /** * \overload */ BOOST_CONSTEXPR inline tribool operator!=(tribool x, bool y) BOOST_NOEXCEPT { return x != tribool(y); } /** * \overload */ BOOST_CONSTEXPR inline tribool operator!=(bool x, tribool y) BOOST_NOEXCEPT { return tribool(x) != y; } /** * \overload */ BOOST_CONSTEXPR inline tribool operator!=(indeterminate_keyword_t, tribool x) BOOST_NOEXCEPT { return tribool(indeterminate) != x; } /** * \overload */ BOOST_CONSTEXPR inline tribool operator!=(tribool x, indeterminate_keyword_t) BOOST_NOEXCEPT { return x != tribool(indeterminate); } } } // end namespace boost::logic // Pull tribool and indeterminate into namespace "boost" namespace boost { using logic::tribool; using logic::indeterminate; } /** * \brief Declare a new name for the third state of a tribool * * Use this macro to declare a new name for the third state of a * tribool. This state can have any number of new names (in addition * to \c indeterminate), all of which will be equivalent. The new name will be * placed in the namespace in which the macro is expanded. * * Example: * BOOST_TRIBOOL_THIRD_STATE(true_or_false) * * tribool x(true_or_false); * // potentially set x * if (true_or_false(x)) { * // don't know what x is * } */ #define BOOST_TRIBOOL_THIRD_STATE(Name) \ inline bool \ Name(boost::logic::tribool x, \ boost::logic::detail::indeterminate_t = \ boost::logic::detail::indeterminate_t()) \ { return x.value == boost::logic::tribool::indeterminate_value; } #endif // BOOST_LOGIC_TRIBOOL_HPP PK �K�[>��� � tribool_fwd.hppnu �[��� // 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) // For more information, see http://www.boost.org #ifndef BOOST_LOGIC_TRIBOOL_FWD_HPP #define BOOST_LOGIC_TRIBOOL_FWD_HPP namespace boost { namespace logic { class tribool; } } #endif // BOOST_LOGIC_TRIBOOL_FWD_HPP PK �K�[���+ �+ tribool_io.hppnu �[��� // 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 <boost/logic/tribool.hpp> #include <boost/detail/workaround.hpp> #include <boost/noncopyable.hpp> #if defined(_MSC_VER) # pragma once #endif #ifndef BOOST_NO_STD_LOCALE # include <locale> #endif #include <string> #include <iostream> 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<typename T> std::basic_string<T> 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<char> default_false_name<char>() { return "false"; } # if !defined(BOOST_NO_CWCHAR) /** * \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<wchar_t> default_false_name<wchar_t>() { 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<typename T> std::basic_string<T> 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<char> default_true_name<char>() { return "true"; } # if !defined(BOOST_NO_CWCHAR) /** * \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<wchar_t> default_true_name<wchar_t>() { 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<typename T> std::basic_string<T> get_default_indeterminate_name(); /// Returns the character string "indeterminate". template<> inline std::basic_string<char> get_default_indeterminate_name<char>() { return "indeterminate"; } #if !defined(BOOST_NO_CWCHAR) /// Returns the wide character string L"indeterminate". template<> inline std::basic_string<wchar_t> get_default_indeterminate_name<wchar_t>() { return L"indeterminate"; } #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<typename CharT> class indeterminate_name : public std::locale::facet, private boost::noncopyable { public: typedef CharT char_type; typedef std::basic_string<CharT> string_type; /// Construct the facet with the default name indeterminate_name() : name_(get_default_indeterminate_name<CharT>()) {} /// Construct the facet with the given name for the indeterminate value explicit indeterminate_name(const string_type& initial_name) : name_(initial_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<typename CharT> std::locale::id indeterminate_name<CharT>::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<bool>(x); \endcode * * When @p x has an indeterminate value, it outputs either the integer * value 2 (if <tt>(out.flags() & std::ios_base::boolalpha) == 0</tt>) * 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<typename CharT, typename Traits> inline std::basic_ostream<CharT, Traits>& operator<<(std::basic_ostream<CharT, Traits>& out, tribool x) { if (!indeterminate(x)) { out << static_cast<bool>(x); } else { typename std::basic_ostream<CharT, Traits>::sentry cerberus(out); if (cerberus) { if (out.flags() & std::ios_base::boolalpha) { #ifndef BOOST_NO_STD_LOCALE if (BOOST_HAS_FACET(indeterminate_name<CharT>, out.getloc())) { const indeterminate_name<CharT>& facet = BOOST_USE_FACET(indeterminate_name<CharT>, out.getloc()); out << facet.name(); } else { out << get_default_indeterminate_name<CharT>(); } #else out << get_default_indeterminate_name<CharT>(); #endif } else out << 2; } } return out; } /** * \brief Writes the indeterminate tribool value to a stream. * * This routine outputs either the integer * value 2 (if <tt>(out.flags() & std::ios_base::boolalpha) == 0</tt>) * 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<typename CharT, typename Traits> inline std::basic_ostream<CharT, Traits>& operator<<(std::basic_ostream<CharT, Traits>& out, bool (*)(tribool, detail::indeterminate_t)) { return out << tribool(indeterminate); } /** * \brief Reads a tribool value from a stream. * * When <tt>(out.flags() & std::ios_base::boolalpha) == 0</tt>, 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 <tt>(out.flags() & std::ios_base::boolalpha) != 0</tt>, 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<typename CharT, typename Traits> inline std::basic_istream<CharT, Traits>& operator>>(std::basic_istream<CharT, Traits>& in, tribool& x) { if (in.flags() & std::ios_base::boolalpha) { typename std::basic_istream<CharT, Traits>::sentry cerberus(in); if (cerberus) { typedef std::basic_string<CharT> string_type; #ifndef BOOST_NO_STD_LOCALE const std::numpunct<CharT>& numpunct_facet = BOOST_USE_FACET(std::numpunct<CharT>, in.getloc()); string_type falsename = numpunct_facet.falsename(); string_type truename = numpunct_facet.truename(); string_type othername; if (BOOST_HAS_FACET(indeterminate_name<CharT>, in.getloc())) { othername = BOOST_USE_FACET(indeterminate_name<CharT>, in.getloc()).name(); } else { othername = get_default_indeterminate_name<CharT>(); } #else string_type falsename = default_false_name<CharT>(); string_type truename = default_true_name<CharT>(); string_type othername = get_default_indeterminate_name<CharT>(); #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 PK �K�[ ��6 6 tribool.hppnu �[��� PK �K�[>��� � O6 tribool_fwd.hppnu �[��� PK �K�[���+ �+ q8 tribool_io.hppnu �[��� PK � Sd
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