author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Tue, 02 Feb 2010 02:01:42 +0200 | |
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// Three-state boolean logic library |
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// Copyright Douglas Gregor 2002-2004. Use, modification and |
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// distribution is subject to the Boost Software License, Version |
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// 1.0. (See 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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#ifndef BOOST_LOGIC_TRIBOOL_HPP |
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#define BOOST_LOGIC_TRIBOOL_HPP |
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#include <boost/logic/tribool_fwd.hpp> |
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#include <boost/config.hpp> |
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#include <boost/detail/workaround.hpp> |
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#if BOOST_WORKAROUND(_MSC_VER, >= 1200) |
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# pragma once |
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#endif |
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namespace boost { namespace logic { |
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/// INTERNAL ONLY |
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namespace detail { |
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/** |
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* INTERNAL ONLY |
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* |
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* \brief A type used only to uniquely identify the 'indeterminate' |
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* function/keyword. |
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*/ |
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struct indeterminate_t |
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{ |
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#if BOOST_WORKAROUND(__BORLANDC__, < 0x0600) |
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char dummy_; // BCB would use 8 bytes by default |
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#endif |
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}; |
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} // end namespace detail |
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/** |
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* INTERNAL ONLY |
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* The type of the 'indeterminate' keyword. This has the same type as the |
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* function 'indeterminate' so that we can recognize when the keyword is |
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* used. |
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*/ |
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typedef bool (*indeterminate_keyword_t)(tribool, detail::indeterminate_t); |
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/** |
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* \brief Keyword and test function for the indeterminate tribool value |
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* |
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* The \c indeterminate function has a dual role. It's first role is |
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* as a unary function that tells whether the tribool value is in the |
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* "indeterminate" state. It's second role is as a keyword |
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* representing the indeterminate (just like "true" and "false" |
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* represent the true and false states). If you do not like the name |
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* "indeterminate", and would prefer to use a different name, see the |
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* macro \c BOOST_TRIBOOL_THIRD_STATE. |
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* |
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* \returns <tt>x.value == tribool::indeterminate_value</tt> |
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* \throws nothrow |
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*/ |
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inline bool |
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indeterminate(tribool x, |
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detail::indeterminate_t dummy = detail::indeterminate_t()); |
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/** |
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* \brief A 3-state boolean type. |
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* |
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* 3-state boolean values are either true, false, or |
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* indeterminate. |
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*/ |
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class tribool |
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{ |
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private: |
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/// INTERNAL ONLY |
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struct dummy { |
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void nonnull() {}; |
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}; |
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typedef void (dummy::*safe_bool)(); |
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public: |
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/** |
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* Construct a new 3-state boolean value with the value 'false'. |
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* |
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* \throws nothrow |
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*/ |
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tribool() : value(false_value) {} |
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/** |
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* Construct a new 3-state boolean value with the given boolean |
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* value, which may be \c true or \c false. |
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* |
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* \throws nothrow |
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*/ |
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tribool(bool value) : value(value? true_value : false_value) {} |
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/** |
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* Construct a new 3-state boolean value with an indeterminate value. |
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* |
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* \throws nothrow |
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*/ |
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tribool(indeterminate_keyword_t) : value(indeterminate_value) {} |
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/** |
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* Use a 3-state boolean in a boolean context. Will evaluate true in a |
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* boolean context only when the 3-state boolean is definitely true. |
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* |
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* \returns true if the 3-state boolean is true, false otherwise |
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* \throws nothrow |
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*/ |
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operator safe_bool() const |
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{ |
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return value == true_value? &dummy::nonnull : 0; |
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} |
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|
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/** |
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* The actual stored value in this 3-state boolean, which may be false, true, |
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* or indeterminate. |
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*/ |
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enum value_t { false_value, true_value, indeterminate_value } value; |
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}; |
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123 |
|
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// Check if the given tribool has an indeterminate value. Also doubles as a |
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// keyword for the 'indeterminate' value |
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inline bool indeterminate(tribool x, detail::indeterminate_t) |
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{ |
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return x.value == tribool::indeterminate_value; |
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} |
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130 |
|
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/** @defgroup logical Logical operations |
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*/ |
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//@{ |
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/** |
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* \brief Computes the logical negation of a tribool |
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* |
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* \returns the logical negation of the tribool, according to the |
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* table: |
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* <table border=1> |
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* <tr> |
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* <th><center><code>!</code></center></th> |
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* <th/> |
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* </tr> |
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* <tr> |
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* <th><center>false</center></th> |
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* <td><center>true</center></td> |
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* </tr> |
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* <tr> |
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* <th><center>true</center></th> |
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* <td><center>false</center></td> |
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* </tr> |
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* <tr> |
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* <th><center>indeterminate</center></th> |
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* <td><center>indeterminate</center></td> |
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* </tr> |
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* </table> |
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* \throws nothrow |
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*/ |
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inline tribool operator!(tribool x) |
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{ |
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return x.value == tribool::false_value? tribool(true) |
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:x.value == tribool::true_value? tribool(false) |
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:tribool(indeterminate); |
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} |
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|
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/** |
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* \brief Computes the logical conjuction of two tribools |
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* |
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* \returns the result of logically ANDing the two tribool values, |
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* according to the following table: |
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* <table border=1> |
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* <tr> |
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* <th><center><code>&&</code></center></th> |
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* <th><center>false</center></th> |
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* <th><center>true</center></th> |
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* <th><center>indeterminate</center></th> |
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* </tr> |
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* <tr> |
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* <th><center>false</center></th> |
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* <td><center>false</center></td> |
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* <td><center>false</center></td> |
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* <td><center>false</center></td> |
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* </tr> |
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* <tr> |
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* <th><center>true</center></th> |
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* <td><center>false</center></td> |
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* <td><center>true</center></td> |
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* <td><center>indeterminate</center></td> |
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* </tr> |
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* <tr> |
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* <th><center>indeterminate</center></th> |
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* <td><center>false</center></td> |
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* <td><center>indeterminate</center></td> |
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* <td><center>indeterminate</center></td> |
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* </tr> |
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* </table> |
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* \throws nothrow |
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*/ |
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inline tribool operator&&(tribool x, tribool y) |
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{ |
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if (static_cast<bool>(!x) || static_cast<bool>(!y)) |
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return false; |
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else if (static_cast<bool>(x) && static_cast<bool>(y)) |
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return true; |
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else |
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return indeterminate; |
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} |
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|
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/** |
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* \overload |
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*/ |
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inline tribool operator&&(tribool x, bool y) |
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{ return y? x : tribool(false); } |
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/** |
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* \overload |
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*/ |
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inline tribool operator&&(bool x, tribool y) |
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{ return x? y : tribool(false); } |
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/** |
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* \overload |
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*/ |
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inline tribool operator&&(indeterminate_keyword_t, tribool x) |
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{ return !x? tribool(false) : tribool(indeterminate); } |
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/** |
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* \overload |
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*/ |
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inline tribool operator&&(tribool x, indeterminate_keyword_t) |
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{ return !x? tribool(false) : tribool(indeterminate); } |
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|
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/** |
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* \brief Computes the logical disjunction of two tribools |
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* |
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* \returns the result of logically ORing the two tribool values, |
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* according to the following table: |
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* <table border=1> |
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* <tr> |
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* <th><center><code>||</code></center></th> |
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* <th><center>false</center></th> |
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* <th><center>true</center></th> |
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* <th><center>indeterminate</center></th> |
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* </tr> |
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* <tr> |
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* <th><center>false</center></th> |
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* <td><center>false</center></td> |
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* <td><center>true</center></td> |
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* <td><center>indeterminate</center></td> |
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* </tr> |
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* <tr> |
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* <th><center>true</center></th> |
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* <td><center>true</center></td> |
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* <td><center>true</center></td> |
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* <td><center>true</center></td> |
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* </tr> |
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* <tr> |
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* <th><center>indeterminate</center></th> |
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* <td><center>indeterminate</center></td> |
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* <td><center>true</center></td> |
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* <td><center>indeterminate</center></td> |
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* </tr> |
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* </table> |
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* \throws nothrow |
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*/ |
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inline tribool operator||(tribool x, tribool y) |
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{ |
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if (static_cast<bool>(!x) && static_cast<bool>(!y)) |
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return false; |
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else if (static_cast<bool>(x) || static_cast<bool>(y)) |
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return true; |
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else |
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return indeterminate; |
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} |
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|
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/** |
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* \overload |
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*/ |
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inline tribool operator||(tribool x, bool y) |
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{ return y? tribool(true) : x; } |
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|
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/** |
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* \overload |
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*/ |
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inline tribool operator||(bool x, tribool y) |
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{ return x? tribool(true) : y; } |
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|
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/** |
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* \overload |
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*/ |
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inline tribool operator||(indeterminate_keyword_t, tribool x) |
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{ return x? tribool(true) : tribool(indeterminate); } |
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|
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/** |
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* \overload |
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*/ |
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inline tribool operator||(tribool x, indeterminate_keyword_t) |
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{ return x? tribool(true) : tribool(indeterminate); } |
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//@} |
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|
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/** |
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* \brief Compare tribools for equality |
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* |
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* \returns the result of comparing two tribool values, according to |
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* the following table: |
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* <table border=1> |
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* <tr> |
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* <th><center><code>==</code></center></th> |
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* <th><center>false</center></th> |
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* <th><center>true</center></th> |
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* <th><center>indeterminate</center></th> |
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* </tr> |
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* <tr> |
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* <th><center>false</center></th> |
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* <td><center>true</center></td> |
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|
316 |
* <td><center>false</center></td> |
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|
317 |
* <td><center>indeterminate</center></td> |
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|
318 |
* </tr> |
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diff
changeset
|
319 |
* <tr> |
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diff
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|
320 |
* <th><center>true</center></th> |
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parents:
diff
changeset
|
321 |
* <td><center>false</center></td> |
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parents:
diff
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|
322 |
* <td><center>true</center></td> |
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parents:
diff
changeset
|
323 |
* <td><center>indeterminate</center></td> |
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Revision: 201002
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parents:
diff
changeset
|
324 |
* </tr> |
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Revision: 201002
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parents:
diff
changeset
|
325 |
* <tr> |
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Revision: 201002
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parents:
diff
changeset
|
326 |
* <th><center>indeterminate</center></th> |
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parents:
diff
changeset
|
327 |
* <td><center>indeterminate</center></td> |
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Revision: 201002
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parents:
diff
changeset
|
328 |
* <td><center>indeterminate</center></td> |
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Revision: 201002
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parents:
diff
changeset
|
329 |
* <td><center>indeterminate</center></td> |
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Revision: 201002
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parents:
diff
changeset
|
330 |
* </tr> |
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Revision: 201002
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parents:
diff
changeset
|
331 |
* </table> |
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Revision: 201002
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parents:
diff
changeset
|
332 |
* \throws nothrow |
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Revision: 201002
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parents:
diff
changeset
|
333 |
*/ |
e4d67989cc36
Revision: 201002
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parents:
diff
changeset
|
334 |
inline tribool operator==(tribool x, tribool y) |
e4d67989cc36
Revision: 201002
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parents:
diff
changeset
|
335 |
{ |
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Revision: 201002
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parents:
diff
changeset
|
336 |
if (indeterminate(x) || indeterminate(y)) |
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Revision: 201002
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parents:
diff
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|
337 |
return indeterminate; |
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Revision: 201002
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parents:
diff
changeset
|
338 |
else |
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Revision: 201002
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parents:
diff
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|
339 |
return x && y || !x && !y; |
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Revision: 201002
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parents:
diff
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|
340 |
} |
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parents:
diff
changeset
|
341 |
|
e4d67989cc36
Revision: 201002
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parents:
diff
changeset
|
342 |
/** |
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Revision: 201002
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parents:
diff
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|
343 |
* \overload |
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|
344 |
*/ |
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Revision: 201002
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parents:
diff
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|
345 |
inline tribool operator==(tribool x, bool y) { return x == tribool(y); } |
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|
346 |
|
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Revision: 201002
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parents:
diff
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|
347 |
/** |
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Revision: 201002
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parents:
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|
348 |
* \overload |
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|
349 |
*/ |
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Revision: 201002
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parents:
diff
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|
350 |
inline tribool operator==(bool x, tribool y) { return tribool(x) == y; } |
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parents:
diff
changeset
|
351 |
|
e4d67989cc36
Revision: 201002
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parents:
diff
changeset
|
352 |
/** |
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Revision: 201002
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|
353 |
* \overload |
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|
354 |
*/ |
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Revision: 201002
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parents:
diff
changeset
|
355 |
inline tribool operator==(indeterminate_keyword_t, tribool x) |
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Revision: 201002
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parents:
diff
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|
356 |
{ return tribool(indeterminate) == x; } |
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|
357 |
|
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Revision: 201002
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parents:
diff
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|
358 |
/** |
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Revision: 201002
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|
359 |
* \overload |
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parents:
diff
changeset
|
360 |
*/ |
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Revision: 201002
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parents:
diff
changeset
|
361 |
inline tribool operator==(tribool x, indeterminate_keyword_t) |
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Revision: 201002
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parents:
diff
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|
362 |
{ return tribool(indeterminate) == x; } |
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Revision: 201002
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parents:
diff
changeset
|
363 |
|
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Revision: 201002
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parents:
diff
changeset
|
364 |
/** |
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Revision: 201002
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parents:
diff
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|
365 |
* \brief Compare tribools for inequality |
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Revision: 201002
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diff
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|
366 |
* |
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Revision: 201002
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|
367 |
* \returns the result of comparing two tribool values for inequality, |
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Revision: 201002
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|
368 |
* according to the following table: |
e4d67989cc36
Revision: 201002
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parents:
diff
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|
369 |
* <table border=1> |
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Revision: 201002
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parents:
diff
changeset
|
370 |
* <tr> |
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Revision: 201002
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parents:
diff
changeset
|
371 |
* <th><center><code>!=</code></center></th> |
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Revision: 201002
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parents:
diff
changeset
|
372 |
* <th><center>false</center></th> |
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Revision: 201002
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parents:
diff
changeset
|
373 |
* <th><center>true</center></th> |
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Revision: 201002
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parents:
diff
changeset
|
374 |
* <th><center>indeterminate</center></th> |
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Revision: 201002
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parents:
diff
changeset
|
375 |
* </tr> |
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Revision: 201002
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parents:
diff
changeset
|
376 |
* <tr> |
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Revision: 201002
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parents:
diff
changeset
|
377 |
* <th><center>false</center></th> |
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Revision: 201002
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parents:
diff
changeset
|
378 |
* <td><center>false</center></td> |
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Revision: 201002
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parents:
diff
changeset
|
379 |
* <td><center>true</center></td> |
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Revision: 201002
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parents:
diff
changeset
|
380 |
* <td><center>indeterminate</center></td> |
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Revision: 201002
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parents:
diff
changeset
|
381 |
* </tr> |
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Revision: 201002
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parents:
diff
changeset
|
382 |
* <tr> |
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Revision: 201002
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parents:
diff
changeset
|
383 |
* <th><center>true</center></th> |
e4d67989cc36
Revision: 201002
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
384 |
* <td><center>true</center></td> |
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Revision: 201002
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
385 |
* <td><center>false</center></td> |
e4d67989cc36
Revision: 201002
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
386 |
* <td><center>indeterminate</center></td> |
e4d67989cc36
Revision: 201002
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parents:
diff
changeset
|
387 |
* </tr> |
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Revision: 201002
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parents:
diff
changeset
|
388 |
* <tr> |
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Revision: 201002
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
389 |
* <th><center>indeterminate</center></th> |
e4d67989cc36
Revision: 201002
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
390 |
* <td><center>indeterminate</center></td> |
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Revision: 201002
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parents:
diff
changeset
|
391 |
* <td><center>indeterminate</center></td> |
e4d67989cc36
Revision: 201002
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
392 |
* <td><center>indeterminate</center></td> |
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Revision: 201002
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parents:
diff
changeset
|
393 |
* </tr> |
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Revision: 201002
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parents:
diff
changeset
|
394 |
* </table> |
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Revision: 201002
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
395 |
* \throws nothrow |
e4d67989cc36
Revision: 201002
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parents:
diff
changeset
|
396 |
*/ |
e4d67989cc36
Revision: 201002
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
397 |
inline tribool operator!=(tribool x, tribool y) |
e4d67989cc36
Revision: 201002
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
398 |
{ |
e4d67989cc36
Revision: 201002
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
399 |
if (indeterminate(x) || indeterminate(y)) |
e4d67989cc36
Revision: 201002
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
400 |
return indeterminate; |
e4d67989cc36
Revision: 201002
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
401 |
else |
e4d67989cc36
Revision: 201002
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
402 |
return !(x && y || !x && !y); |
e4d67989cc36
Revision: 201002
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
403 |
} |
e4d67989cc36
Revision: 201002
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
404 |
|
e4d67989cc36
Revision: 201002
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
405 |
/** |
e4d67989cc36
Revision: 201002
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
406 |
* \overload |
e4d67989cc36
Revision: 201002
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
407 |
*/ |
e4d67989cc36
Revision: 201002
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
408 |
inline tribool operator!=(tribool x, bool y) { return x != tribool(y); } |
e4d67989cc36
Revision: 201002
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
409 |
|
e4d67989cc36
Revision: 201002
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
410 |
/** |
e4d67989cc36
Revision: 201002
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
411 |
* \overload |
e4d67989cc36
Revision: 201002
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
412 |
*/ |
e4d67989cc36
Revision: 201002
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
413 |
inline tribool operator!=(bool x, tribool y) { return tribool(x) != y; } |
e4d67989cc36
Revision: 201002
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
414 |
|
e4d67989cc36
Revision: 201002
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
415 |
/** |
e4d67989cc36
Revision: 201002
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
416 |
* \overload |
e4d67989cc36
Revision: 201002
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
417 |
*/ |
e4d67989cc36
Revision: 201002
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
418 |
inline tribool operator!=(indeterminate_keyword_t, tribool x) |
e4d67989cc36
Revision: 201002
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
419 |
{ return tribool(indeterminate) != x; } |
e4d67989cc36
Revision: 201002
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
420 |
|
e4d67989cc36
Revision: 201002
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
421 |
/** |
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* \overload |
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*/ |
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inline tribool operator!=(tribool x, indeterminate_keyword_t) |
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{ return x != tribool(indeterminate); } |
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|
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} } // end namespace boost::logic |
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|
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// Pull tribool and indeterminate into namespace "boost" |
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namespace boost { |
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using logic::tribool; |
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using logic::indeterminate; |
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} |
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|
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/** |
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* \brief Declare a new name for the third state of a tribool |
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* |
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* Use this macro to declare a new name for the third state of a |
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* tribool. This state can have any number of new names (in addition |
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* to \c indeterminate), all of which will be equivalent. The new name will be |
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* placed in the namespace in which the macro is expanded. |
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* |
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* Example: |
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* BOOST_TRIBOOL_THIRD_STATE(true_or_false) |
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* |
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* tribool x(true_or_false); |
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* // potentially set x |
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* if (true_or_false(x)) { |
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* // don't know what x is |
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* } |
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*/ |
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#define BOOST_TRIBOOL_THIRD_STATE(Name) \ |
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inline bool \ |
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Name(boost::logic::tribool x, \ |
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boost::logic::detail::indeterminate_t dummy = \ |
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boost::logic::detail::indeterminate_t()) \ |
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{ return x.value == boost::logic::tribool::indeterminate_value; } |
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|
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#endif // BOOST_LOGIC_TRIBOOL_HPP |
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