Add, and update, documentation build targets.

C++11 updates for tribool: added noexcepts and constexprs, fixed warnings

Tested on Linux with gcc-4.9.1.

doc/Jamfile.v2

@@ -1,3 +1,13 @@
+# Tribool library
+
+# Copyright (C) 2002-2003 Douglas Gregor
+
+# 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/
+
 project boost-sandbox/utility/doc ;
 import boostbook ;
 import doxygen ;
@@ -6,4 +16,21 @@ doxygen reference : [ glob ../../../boost/logic/tribool.hpp ]
                     [ glob ../../../boost/logic/tribool_fwd.hpp ]
                     [ glob ../../../boost/logic/tribool_io.hpp ]
                   ;
-boostbook tribool : tribool.boostbook ;
+boostbook tribool 
+    : 
+    tribool.boostbook 
+    :
+        <xsl:param>boost.root=../../../..
+        <format>pdf:<xsl:param>boost.url.prefix=http://www.boost.org/doc/libs/release/doc/html
+        <dependency>reference
+    ;
+
+###############################################################################
+alias boostdoc
+    : tribool/<format>docbook
+    :
+    :
+    : ;
+explicit boostdoc ;
+alias boostrelease ;
+explicit boostrelease ;

doc/tribool.boostbook

@@ -2,7 +2,7 @@
 <!DOCTYPE library PUBLIC "-//Boost//DTD BoostBook XML V1.0//EN"
   "http://www.boost.org/tools/boostbook/dtd/boostbook.dtd">
 <library name="Tribool" dirname="logic" id="tribool"
-         last-revision="$Date: 2004/07/25 03:01:38 $" xmlns:xi="http://www.w3.org/2001/XInclude">
+         last-revision="$Date: 2007/05/03 03:28:53 $" xmlns:xi="http://www.w3.org/2001/XInclude">
   <libraryinfo>
     <author>
       <firstname>Douglas</firstname>
@@ -138,6 +138,18 @@ if (<functionname>indeterminate</functionname>(x)) {
 else {
   // report success or failure of x
 }</programlisting>
+
+  <para> All the logical operators and methods of <code><classname>tribool</classname></code> are marked
+  as <code>constexpr</code> in C++11. It means that <code><classname>tribool</classname></code> can
+  be used in compile time expressions:</para>
+
+  <programlisting>constexpr <classname>tribool</classname> x = (tribool(true) || tribool(indeterminate));
+<functionname>static_assert</functionname>(x, "Must be true!");
+</programlisting>
+
+  <note>Some compilers may have troubles with evaluating <code>tribool::operator safe_bool()</code> at compile time.</note>
+
+
 </section>
   
   <section>
@@ -197,7 +209,7 @@ cout &lt;&lt; boolalpha &lt;&lt; x &lt;&lt; endl; // Prints "maybe"</programlist
 
   </section>
 
-  <xi:include href="reference.boostbook"/>
+  <xi:include href="reference.xml"/>
 
   <testsuite id="tribool.tests">
     <run-test filename="tribool_test.cpp">

include/boost/logic/tribool.hpp

@@ -0,0 +1,456 @@
+// 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(__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
+{
+private:
+  /// INTERNAL ONLY
+  struct dummy {
+    void nonnull() {};
+  };
+
+  typedef void (dummy::*safe_bool)();
+
+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
+   */
+  BOOST_CONSTEXPR operator safe_bool() const BOOST_NOEXCEPT
+  {
+    return value == true_value? &dummy::nonnull : 0;
+  }
+
+  /**
+   * 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 conjuction 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>&amp;&amp;</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
+

include/boost/logic/tribool_fwd.hpp

@@ -0,0 +1,15 @@
+// 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

include/boost/logic/tribool_io.hpp

@@ -0,0 +1,343 @@
+// 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"; }
+
+#  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<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"; }
+
+#  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<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"; }
+
+#ifndef BOOST_NO_WCHAR_T
+/// 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

index.html

@@ -0,0 +1,16 @@
+
+<!--
+Copyright 2011 Daniel James.
+Distributed under 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)
+-->
+
+<html>
+<head>
+    <meta http-equiv="refresh" content="0; URL=../../doc/html/tribool.html">
+</head>
+<body>
+Automatic redirection failed, please go to
+<a href="../../doc/html/tribool.html">../../doc/html/tribool.html</a>
+</body>
+</html>

meta/libraries.json

@@ -0,0 +1,15 @@
+{
+    "key": "logic/tribool",
+    "name": "Tribool",
+    "authors": [
+        "Doug Gregor"
+    ],
+    "description": "3-state boolean type library.",
+    "documentation": "/doc/html/tribool.html",
+    "category": [
+        "Miscellaneous"
+    ],
+    "maintainers": [
+        "Douglas Gregor <dgregor -at- cs.indiana.edu>"
+    ]
+}

test/Jamfile

@@ -1,35 +0,0 @@
-# Tribool library
-
-# Copyright (C) 2002-2003 Douglas Gregor
-
-# 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/
-
-
-# Testing Jamfile autogenerated from XML source
-subproject libs/logic/test ;
-
-# bring in rules for testing
-SEARCH on testing.jam = $(BOOST_BUILD_PATH) ;
-include testing.jam ;
-
-# Make tests run by default.
-DEPENDS all : test ;
-
-{
-  # look in BOOST_ROOT for sources first, just in this Jamfile
-  local SEARCH_SOURCE = $(BOOST_ROOT) $(SEARCH_SOURCE) ;
-
-  test-suite logic
-    : 
-    [ run libs/logic/test/tribool_test.cpp :  :  :  :  ]
-
-    [ run libs/logic/test/tribool_rename_test.cpp :  :  :  :  ]
-
-    [ run libs/logic/test/tribool_io_test.cpp :  :  :  :  ]
-   ;
-}
-      

test/Jamfile.v2

@@ -0,0 +1,17 @@
+# Tribool library
+
+# Copyright (C) 2002-2003 Douglas Gregor
+
+# 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/
+
+  test-suite logic  : 
+    [ run tribool_test.cpp ]
+    [ run tribool_rename_test.cpp ]
+    [ run tribool_io_test.cpp ]
+   ;
+
+      

test/tribool_io_test.cpp

@@ -8,6 +8,7 @@
 #include <sstream>
 #include <string>
 #include <iostream>
+#include <ios>     // for std::boolalpha
 
 #ifndef BOOST_NO_STD_LOCALE
 #  include <locale>
@@ -27,14 +28,14 @@ int test_main(int, char*[])
   x = false;
   out << x;
   std::cout << "Output false (noboolalpha): " << out.str() << std::endl;
-  BOOST_TEST(out.str() == "0");
+  BOOST_CHECK(out.str() == "0");
 
   // Output true (noboolalpha)
   out.str(std::string());
   x = true;
   out << x;
   std::cout << "Output true (noboolalpha): " << out.str() << std::endl;
-  BOOST_TEST(out.str() == "1");
+  BOOST_CHECK(out.str() == "1");
 
   // Output indeterminate (noboolalpha)
   out.str(std::string());
@@ -42,7 +43,14 @@ int test_main(int, char*[])
   out << x;
   std::cout << "Output indeterminate (noboolalpha): " << out.str()
             << std::endl;
-  BOOST_TEST(out.str() == "2");
+  BOOST_CHECK(out.str() == "2");
+
+  // Output indeterminate (noboolalpha)
+  out.str(std::string());
+  out << indeterminate;
+  std::cout << "Output indeterminate (noboolalpha): " << out.str()
+            << std::endl;
+  BOOST_CHECK(out.str() == "2");
 
 #ifndef BOOST_NO_STD_LOCALE
   const std::numpunct<char>& punct =
@@ -53,7 +61,7 @@ int test_main(int, char*[])
   x = false;
   out << std::boolalpha << x;
   std::cout << "Output false (boolalpha): " << out.str() << std::endl;
-  BOOST_TEST(out.str() == punct.falsename());
+  BOOST_CHECK(out.str() == punct.falsename());
 
   // Output true (boolalpha)
   out.str(std::string());
@@ -61,7 +69,7 @@ int test_main(int, char*[])
   out << std::boolalpha << x;
   std::cout << "Output true (boolalpha): " << out.str() << std::endl;
 
-  BOOST_TEST(out.str() == punct.truename());
+  BOOST_CHECK(out.str() == punct.truename());
 
   // Output indeterminate (boolalpha - default name)
   out.str(std::string());
@@ -69,7 +77,14 @@ int test_main(int, char*[])
   out << std::boolalpha << x;
   std::cout << "Output indeterminate (boolalpha - default name): " << out.str()
             << std::endl;
-  BOOST_TEST(out.str() == "indeterminate");
+  BOOST_CHECK(out.str() == "indeterminate");
+
+  // Output indeterminate (boolalpha - default name)
+  out.str(std::string());
+  out << std::boolalpha << indeterminate;
+  std::cout << "Output indeterminate (boolalpha - default name): " << out.str()
+            << std::endl;
+  BOOST_CHECK(out.str() == "indeterminate");
 
 #  if BOOST_WORKAROUND(BOOST_DINKUMWARE_STDLIB, == 1)
   // No template constructors, so we can't build the test locale
@@ -82,7 +97,7 @@ int test_main(int, char*[])
   out << std::boolalpha << x;
   std::cout << "Output indeterminate (boolalpha - \"maybe\"): " << out.str()
             << std::endl;
-  BOOST_TEST(out.str() == "maybe");
+  BOOST_CHECK(out.str() == "maybe");
 #  endif
 #endif // ! BOOST_NO_STD_LOCALE
 
@@ -93,7 +108,7 @@ int test_main(int, char*[])
     std::istringstream in("0");
     std::cout << "Input \"0\" (checks for false)" << std::endl;
     in >> x;
-    BOOST_TEST(x == false);
+    BOOST_CHECK(x == false);
   }
 
   // Input true (noboolalpha)
@@ -101,7 +116,7 @@ int test_main(int, char*[])
     std::istringstream in("1");
     std::cout << "Input \"1\" (checks for true)" << std::endl;
     in >> x;
-    BOOST_TEST(x == true);
+    BOOST_CHECK(x == true);
   }
 
   // Input false (noboolalpha)
@@ -109,14 +124,14 @@ int test_main(int, char*[])
     std::istringstream in("2");
     std::cout << "Input \"2\" (checks for indeterminate)" << std::endl;
     in >> x;
-    BOOST_TEST(indeterminate(x));
+    BOOST_CHECK(indeterminate(x));
   }
 
   // Input bad number (noboolalpha)
   {
     std::istringstream in("3");
     std::cout << "Input \"3\" (checks for failure)" << std::endl;
-    BOOST_TEST(!(in >> x));
+    BOOST_CHECK(!(in >> x));
   }
 
   // Input false (boolalpha)
@@ -124,7 +139,7 @@ int test_main(int, char*[])
     std::istringstream in("false");
     std::cout << "Input \"false\" (checks for false)" << std::endl;
     in >> std::boolalpha >> x;
-    BOOST_TEST(x == false);
+    BOOST_CHECK(x == false);
   }
 
   // Input true (boolalpha)
@@ -132,7 +147,7 @@ int test_main(int, char*[])
     std::istringstream in("true");
     std::cout << "Input \"true\" (checks for true)" << std::endl;
     in >> std::boolalpha >> x;
-    BOOST_TEST(x == true);
+    BOOST_CHECK(x == true);
   }
 
   // Input indeterminate (boolalpha)
@@ -141,7 +156,7 @@ int test_main(int, char*[])
     std::cout << "Input \"indeterminate\" (checks for indeterminate)"
               << std::endl;
     in >> std::boolalpha >> x;
-    BOOST_TEST(indeterminate(x));
+    BOOST_CHECK(indeterminate(x));
   }
 
   // Input bad string (boolalpha)
@@ -149,7 +164,7 @@ int test_main(int, char*[])
     std::istringstream in("bad");
     std::cout << "Input \"bad\" (checks for failure)"
               << std::endl;
-    BOOST_TEST(!(in >> std::boolalpha >> x));
+    BOOST_CHECK(!(in >> std::boolalpha >> x));
   }
 
 #if BOOST_WORKAROUND(BOOST_DINKUMWARE_STDLIB, == 1)
@@ -163,7 +178,7 @@ int test_main(int, char*[])
     std::cout << "Input \"maybe\" (checks for indeterminate, uses locales)"
               << std::endl;
     in >> std::boolalpha >> x;
-    BOOST_TEST(indeterminate(x));
+    BOOST_CHECK(indeterminate(x));
   }
 
   // Input indeterminate named "true_or_false" (boolalpha)
@@ -175,7 +190,7 @@ int test_main(int, char*[])
     std::cout << "Input \"true_or_false\" (checks for indeterminate)"
               << std::endl;
     in >> std::boolalpha >> x;
-    BOOST_TEST(indeterminate(x));
+    BOOST_CHECK(indeterminate(x));
   }
 #endif
 

test/tribool_rename_test.cpp

@@ -19,103 +19,103 @@ int test_main(int,char*[])
   tribool y(true); // true
   tribool z(maybe); // maybe
 
-  BOOST_TEST(!x);
-  BOOST_TEST(x == false);
-  BOOST_TEST(false == x);
-  BOOST_TEST(x != true);
-  BOOST_TEST(true != x);
-  BOOST_TEST(maybe(x == maybe));
-  BOOST_TEST(maybe(maybe == x));
-  BOOST_TEST(maybe(x != maybe));
-  BOOST_TEST(maybe(maybe != x));
-  BOOST_TEST(x == x);
-  BOOST_TEST(!(x != x));
-  BOOST_TEST(!(x && true));
-  BOOST_TEST(!(true && x));
-  BOOST_TEST(x || true);
-  BOOST_TEST(true || x);
+  BOOST_CHECK(!x);
+  BOOST_CHECK(x == false);
+  BOOST_CHECK(false == x);
+  BOOST_CHECK(x != true);
+  BOOST_CHECK(true != x);
+  BOOST_CHECK(maybe(x == maybe));
+  BOOST_CHECK(maybe(maybe == x));
+  BOOST_CHECK(maybe(x != maybe));
+  BOOST_CHECK(maybe(maybe != x));
+  BOOST_CHECK(x == x);
+  BOOST_CHECK(!(x != x));
+  BOOST_CHECK(!(x && true));
+  BOOST_CHECK(!(true && x));
+  BOOST_CHECK(x || true);
+  BOOST_CHECK(true || x);
 
-  BOOST_TEST(y);
-  BOOST_TEST(y == true);
-  BOOST_TEST(true == y);
-  BOOST_TEST(y != false);
-  BOOST_TEST(false != y);
-  BOOST_TEST(maybe(y == maybe));
-  BOOST_TEST(maybe(maybe == y));
-  BOOST_TEST(maybe(y != maybe));
-  BOOST_TEST(maybe(maybe != y));
-  BOOST_TEST(y == y);
-  BOOST_TEST(!(y != y));
+  BOOST_CHECK(y);
+  BOOST_CHECK(y == true);
+  BOOST_CHECK(true == y);
+  BOOST_CHECK(y != false);
+  BOOST_CHECK(false != y);
+  BOOST_CHECK(maybe(y == maybe));
+  BOOST_CHECK(maybe(maybe == y));
+  BOOST_CHECK(maybe(y != maybe));
+  BOOST_CHECK(maybe(maybe != y));
+  BOOST_CHECK(y == y);
+  BOOST_CHECK(!(y != y));
 
-  BOOST_TEST(maybe(z || !z));
-  BOOST_TEST(maybe(z == true));
-  BOOST_TEST(maybe(true == z));
-  BOOST_TEST(maybe(z == false));
-  BOOST_TEST(maybe(false == z));
-  BOOST_TEST(maybe(z == maybe));
-  BOOST_TEST(maybe(maybe == z));
-  BOOST_TEST(maybe(z != maybe));
-  BOOST_TEST(maybe(maybe != z));
-  BOOST_TEST(maybe(z == z));
-  BOOST_TEST(maybe(z != z));
+  BOOST_CHECK(maybe(z || !z));
+  BOOST_CHECK(maybe(z == true));
+  BOOST_CHECK(maybe(true == z));
+  BOOST_CHECK(maybe(z == false));
+  BOOST_CHECK(maybe(false == z));
+  BOOST_CHECK(maybe(z == maybe));
+  BOOST_CHECK(maybe(maybe == z));
+  BOOST_CHECK(maybe(z != maybe));
+  BOOST_CHECK(maybe(maybe != z));
+  BOOST_CHECK(maybe(z == z));
+  BOOST_CHECK(maybe(z != z));
 
-  BOOST_TEST(!(x == y));
-  BOOST_TEST(x != y);
-  BOOST_TEST(maybe(x == z));
-  BOOST_TEST(maybe(x != z));
-  BOOST_TEST(maybe(y == z));
-  BOOST_TEST(maybe(y != z));
+  BOOST_CHECK(!(x == y));
+  BOOST_CHECK(x != y);
+  BOOST_CHECK(maybe(x == z));
+  BOOST_CHECK(maybe(x != z));
+  BOOST_CHECK(maybe(y == z));
+  BOOST_CHECK(maybe(y != z));
 
-  BOOST_TEST(!(x && y));
-  BOOST_TEST(x || y);
-  BOOST_TEST(!(x && z));
-  BOOST_TEST(maybe(y && z));
-  BOOST_TEST(maybe(z && z));
-  BOOST_TEST(maybe(z || z));
-  BOOST_TEST(maybe(x || z));
-  BOOST_TEST(y || z);
+  BOOST_CHECK(!(x && y));
+  BOOST_CHECK(x || y);
+  BOOST_CHECK(!(x && z));
+  BOOST_CHECK(maybe(y && z));
+  BOOST_CHECK(maybe(z && z));
+  BOOST_CHECK(maybe(z || z));
+  BOOST_CHECK(maybe(x || z));
+  BOOST_CHECK(y || z);
 
-  BOOST_TEST(maybe(y && maybe));
-  BOOST_TEST(maybe(maybe && y));
-  BOOST_TEST(!(x && maybe));
-  BOOST_TEST(!(maybe && x));
+  BOOST_CHECK(maybe(y && maybe));
+  BOOST_CHECK(maybe(maybe && y));
+  BOOST_CHECK(!(x && maybe));
+  BOOST_CHECK(!(maybe && x));
 
-  BOOST_TEST(maybe || y);
-  BOOST_TEST(y || maybe);
-  BOOST_TEST(maybe(x || maybe));
-  BOOST_TEST(maybe(maybe || x));
+  BOOST_CHECK(maybe || y);
+  BOOST_CHECK(y || maybe);
+  BOOST_CHECK(maybe(x || maybe));
+  BOOST_CHECK(maybe(maybe || x));
 
   // Test the if (z) ... else (!z) ... else ... idiom
   if (z) {
-    BOOST_TEST(false);
+    BOOST_CHECK(false);
   }
   else if (!z) {
-    BOOST_TEST(false);
+    BOOST_CHECK(false);
   }
   else {
-    BOOST_TEST(true);
+    BOOST_CHECK(true);
   }
 
   z = true;
   if (z) {
-    BOOST_TEST(true);
+    BOOST_CHECK(true);
   }
   else if (!z) {
-    BOOST_TEST(false);
+    BOOST_CHECK(false);
   }
   else {
-    BOOST_TEST(false);
+    BOOST_CHECK(false);
   }
 
   z = false;
   if (z) {
-    BOOST_TEST(false);
+    BOOST_CHECK(false);
   }
   else if (!z) {
-    BOOST_TEST(true);
+    BOOST_CHECK(true);
   }
   else {
-    BOOST_TEST(false);
+    BOOST_CHECK(false);
   }
 
   std::cout << "no errors detected\n";

test/tribool_test.cpp

@@ -15,105 +15,125 @@ int test_main(int, char*[])
   tribool y(true); // true
   tribool z(indeterminate); // indeterminate
 
-  BOOST_TEST(!x);
-  BOOST_TEST(x == false);
-  BOOST_TEST(false == x);
-  BOOST_TEST(x != true);
-  BOOST_TEST(true != x);
-  BOOST_TEST(indeterminate(x == indeterminate));
-  BOOST_TEST(indeterminate(indeterminate == x));
-  BOOST_TEST(indeterminate(x != indeterminate));
-  BOOST_TEST(indeterminate(indeterminate != x));
-  BOOST_TEST(x == x);
-  BOOST_TEST(!(x != x));
-  BOOST_TEST(!(x && true));
-  BOOST_TEST(!(true && x));
-  BOOST_TEST(x || true);
-  BOOST_TEST(true || x);
+  BOOST_CHECK(!x);
+  BOOST_CHECK(x == false);
+  BOOST_CHECK(false == x);
+  BOOST_CHECK(x != true);
+  BOOST_CHECK(true != x);
+  BOOST_CHECK(indeterminate(x == indeterminate));
+  BOOST_CHECK(indeterminate(indeterminate == x));
+  BOOST_CHECK(indeterminate(x != indeterminate));
+  BOOST_CHECK(indeterminate(indeterminate != x));
+  BOOST_CHECK(x == x);
+  BOOST_CHECK(!(x != x));
+  BOOST_CHECK(!(x && true));
+  BOOST_CHECK(!(true && x));
+  BOOST_CHECK(x || true);
+  BOOST_CHECK(true || x);
 
-  BOOST_TEST(y);
-  BOOST_TEST(y == true);
-  BOOST_TEST(true == y);
-  BOOST_TEST(y != false);
-  BOOST_TEST(false != y);
-  BOOST_TEST(indeterminate(y == indeterminate));
-  BOOST_TEST(indeterminate(indeterminate == y));
-  BOOST_TEST(indeterminate(y != indeterminate));
-  BOOST_TEST(indeterminate(indeterminate != y));
-  BOOST_TEST(y == y);
-  BOOST_TEST(!(y != y));
+  BOOST_CHECK(y);
+  BOOST_CHECK(y == true);
+  BOOST_CHECK(true == y);
+  BOOST_CHECK(y != false);
+  BOOST_CHECK(false != y);
+  BOOST_CHECK(indeterminate(y == indeterminate));
+  BOOST_CHECK(indeterminate(indeterminate == y));
+  BOOST_CHECK(indeterminate(y != indeterminate));
+  BOOST_CHECK(indeterminate(indeterminate != y));
+  BOOST_CHECK(y == y);
+  BOOST_CHECK(!(y != y));
 
-  BOOST_TEST(indeterminate(z || !z));
-  BOOST_TEST(indeterminate(z == true));
-  BOOST_TEST(indeterminate(true == z));
-  BOOST_TEST(indeterminate(z == false));
-  BOOST_TEST(indeterminate(false == z));
-  BOOST_TEST(indeterminate(z == indeterminate));
-  BOOST_TEST(indeterminate(indeterminate == z));
-  BOOST_TEST(indeterminate(z != indeterminate));
-  BOOST_TEST(indeterminate(indeterminate != z));
-  BOOST_TEST(indeterminate(z == z));
-  BOOST_TEST(indeterminate(z != z));
+  BOOST_CHECK(indeterminate(z || !z));
+  BOOST_CHECK(indeterminate(z == true));
+  BOOST_CHECK(indeterminate(true == z));
+  BOOST_CHECK(indeterminate(z == false));
+  BOOST_CHECK(indeterminate(false == z));
+  BOOST_CHECK(indeterminate(z == indeterminate));
+  BOOST_CHECK(indeterminate(indeterminate == z));
+  BOOST_CHECK(indeterminate(z != indeterminate));
+  BOOST_CHECK(indeterminate(indeterminate != z));
+  BOOST_CHECK(indeterminate(z == z));
+  BOOST_CHECK(indeterminate(z != z));
 
-  BOOST_TEST(!(x == y));
-  BOOST_TEST(x != y);
-  BOOST_TEST(indeterminate(x == z));
-  BOOST_TEST(indeterminate(x != z));
-  BOOST_TEST(indeterminate(y == z));
-  BOOST_TEST(indeterminate(y != z));
+  BOOST_CHECK(!(x == y));
+  BOOST_CHECK(x != y);
+  BOOST_CHECK(indeterminate(x == z));
+  BOOST_CHECK(indeterminate(x != z));
+  BOOST_CHECK(indeterminate(y == z));
+  BOOST_CHECK(indeterminate(y != z));
 
-  BOOST_TEST(!(x && y));
-  BOOST_TEST(x || y);
-  BOOST_TEST(!(x && z));
-  BOOST_TEST(indeterminate(y && z));
-  BOOST_TEST(indeterminate(z && z));
-  BOOST_TEST(indeterminate(z || z));
-  BOOST_TEST(indeterminate(x || z));
-  BOOST_TEST(y || z);
+  BOOST_CHECK(!(x && y));
+  BOOST_CHECK(x || y);
+  BOOST_CHECK(!(x && z));
+  BOOST_CHECK(indeterminate(y && z));
+  BOOST_CHECK(indeterminate(z && z));
+  BOOST_CHECK(indeterminate(z || z));
+  BOOST_CHECK(indeterminate(x || z));
+  BOOST_CHECK(y || z);
 
-  BOOST_TEST(indeterminate(y && indeterminate));
-  BOOST_TEST(indeterminate(indeterminate && y));
-  BOOST_TEST(!(x && indeterminate));
-  BOOST_TEST(!(indeterminate && x));
+  BOOST_CHECK(indeterminate(y && indeterminate));
+  BOOST_CHECK(indeterminate(indeterminate && y));
+  BOOST_CHECK(!(x && indeterminate));
+  BOOST_CHECK(!(indeterminate && x));
 
-  BOOST_TEST(indeterminate || y);
-  BOOST_TEST(y || indeterminate);
-  BOOST_TEST(indeterminate(x || indeterminate));
-  BOOST_TEST(indeterminate(indeterminate || x));
+  BOOST_CHECK(indeterminate || y);
+  BOOST_CHECK(y || indeterminate);
+  BOOST_CHECK(indeterminate(x || indeterminate));
+  BOOST_CHECK(indeterminate(indeterminate || x));
 
   // Test the if (z) ... else (!z) ... else ... idiom
   if (z) {
-    BOOST_TEST(false);
+    BOOST_CHECK(false);
   }
   else if (!z) {
-    BOOST_TEST(false);
+    BOOST_CHECK(false);
   }
   else {
-    BOOST_TEST(true);
+    BOOST_CHECK(true);
   }
 
   z = true;
   if (z) {
-    BOOST_TEST(true);
+    BOOST_CHECK(true);
   }
   else if (!z) {
-    BOOST_TEST(false);
+    BOOST_CHECK(false);
   }
   else {
-    BOOST_TEST(false);
+    BOOST_CHECK(false);
   }
 
   z = false;
   if (z) {
-    BOOST_TEST(false);
+    BOOST_CHECK(false);
   }
   else if (!z) {
-    BOOST_TEST(true);
+    BOOST_CHECK(true);
   }
   else {
-    BOOST_TEST(false);
+    BOOST_CHECK(false);
   }
 
+#ifndef BOOST_NO_CXX11_CONSTEXPR
+  constexpr bool res_ors = indeterminate(false || tribool(false) || false || indeterminate); // true
+  BOOST_CHECK(res_ors);
+  char array_ors[res_ors ? 2 : 3];
+  BOOST_CHECK(sizeof(array_ors) / sizeof(char) == 2);
+
+  constexpr bool res_ands = !indeterminate(!(true && tribool(true) && true && indeterminate)); // false
+  BOOST_CHECK(!res_ands);
+  char array_ands[res_ands ? 2 : 3];
+  BOOST_CHECK(sizeof(array_ands) / sizeof(char) == 3);
+
+  // We avoid checking the tribool::operator safe_bool(),
+  // because GCC-4.8 fails to evaluate it at compile-time.
+  // Clang compiles well.
+  //
+  // constexpr bool res_safe_bool = tribool(true); // false
+  // constexpr tribool xxx = (tribool(true) || tribool(indeterminate));
+  // static_assert(xxx, "Must be true!");
+#endif
+
   std::cout << "no errors detected\n";
   return 0;
 }