Release 1.49.0

[SVN r77094]

enable_if.html

@@ -21,6 +21,7 @@
 <BR>
 <BR>
 Copyright 2003 Jaakko J&auml;rvi, Jeremiah Willcock, Andrew Lumsdaine.<BR>
+Copyright 2011 Matt Calabrese.<BR>
 <BR>
 <!--TOC section Introduction-->
 
@@ -81,7 +82,7 @@ definitions to find this out. Instantiating the latter definition with
 <PRE>int::result_type negate(const int&amp;);
 
 </PRE>
-where the return type is invalid. If this was an error, adding an unrelated function template 
+where the return type is invalid. If this were an error, adding an unrelated function template 
 (that was never called) could break otherwise valid code.
 Due to the SFINAE principle the above example is not, however, erroneous. 
 The latter definition of <TT>negate</TT> is simply removed from the overload resolution set.<BR>
@@ -154,6 +155,7 @@ typename enable_if&lt;boost::is_arithmetic&lt;T&gt;, T&gt;::type
 foo(T t) { return t; }
 
 </PRE>
+
 <!--TOC section Using <TT>enable_if</TT>-->
 
 <H2><A NAME="htoc5">3</A>&nbsp;&nbsp;Using <TT>enable_if</TT></H2><!--SEC END -->
@@ -162,8 +164,19 @@ foo(T t) { return t; }
 The <TT>enable_if</TT> templates are defined in
 <TT>boost/utility/enable_if.hpp</TT>, which is included by <TT>boost/utility.hpp</TT>.<BR>
 <BR>
-The <TT>enable_if</TT> template can be used either as the return type, or as an 
+With respect to function templates, <TT>enable_if</TT> can be used in multiple different ways:
-extra argument. For example, the <TT>foo</TT> function in the previous section could also be written
+
+<UL>
+<LI>As the return type of an instantiatied function
+<LI>As an extra parameter of an instantiated function
+<LI>As an extra template parameter (useful only in a compiler that supports C++0x default
+arguments for function template parameters, see <A href="#sec:enable_if_0x">Enabling function
+templates in C++0x</a> for details)
+</UL>
+
+In the previous section, the return type form of <TT>enable_if</TT> was shown. As an example
+of using the form of <TT>enable_if</TT> that works via an extra function parameter, the
+<TT>foo</TT> function in the previous section could also be written
 as:
 <PRE>template &lt;class T&gt;
 T foo(T t, typename enable_if&lt;boost::is_arithmetic&lt;T&gt; &gt;::type* dummy = 0); 
@@ -173,18 +186,80 @@ a default value to keep the parameter hidden from client code.
 Note that the second template argument was not given to <TT>enable_if</TT>, as the default 
 <TT>void</TT> gives the desired behavior.<BR>
 <BR>
-Whether to write the enabler as an argument or within the return type is
+Which way to write the enabler is largely a matter of taste, but for certain functions, only a
-largely a matter of taste, but for certain functions, only one
+subset of the options is possible:
-alternative is possible:
 <UL><LI>
-Operators have a fixed number of arguments, thus <TT>enable_if</TT> must be used in the return type.
+Many operators have a fixed number of arguments, thus <TT>enable_if</TT> must be used either in the
-<LI>Constructors and destructors do not have a return type; an extra argument is the only option.
+return type or in an extra template parameter.
-<LI>There does not seem to be a way to specify an enabler for a conversion operator. Converting constructors,
+<LI>Functions that have a variadic parameter list must use either the return type form or an extra
-however, can have enablers as extra default arguments.
+template parameter.
+<LI>Constructors do not have a return type so you must use either an extra function parameter or an
+extra template parameter.
+<LI>Constructors that have a variadic parameter list must an extra template parameter.
+<LI>Conversion operators can only be written with an extra template parameter.
 </UL>
+<!--TOC subsection Enabling function templates in C++0x-->
+
+<A NAME="sec:enable_if_0x"></A>
+<H3><A NAME="htoc7">3.1</A>&nbsp;&nbsp;Enabling function templates in C++0x</H3><!--SEC END -->
+
+In a compiler which supports C++0x default arguments for function template parameters, you can
+enable and disable function templates by adding an additional template parameter. This approach
+works in all situations where you would use either the return type form of <TT>enable_if</TT> or
+the function parameter form, including operators, constructors, variadic function templates, and
+even overloaded conversion operations.
+
+As an example:
+
+<PRE>#include &lt;boost/type_traits/is_arithmetic.hpp&gt;
+#include &lt;boost/type_traits/is_pointer.hpp&gt;
+#include &lt;boost/utility/enable_if.hpp&gt;
+
+class test
+{
+public:
+  // A constructor that works for any argument list of size 10
+  template&lt; class... T
+          , typename boost::enable_if_c&lt; sizeof...( T ) == 10, int &gt;::type = 0
+          &gt;
+  test( T&amp;&amp;... );
+
+  // A conversion operation that can convert to any arithmetic type
+  template&lt; class T
+          , typename boost::enable_if&lt; boost::is_arithmetic&lt; T &gt;, int &gt;::type = 0
+          &gt;
+  operator T() const;
+
+  // A conversion operation that can convert to any pointer type
+  template&lt; class T
+          , typename boost::enable_if&lt; boost::is_pointer&lt; T &gt;, int &gt;::type = 0
+          &gt;
+  operator T() const;
+};
+
+int main()
+{
+  // Works
+  test test_( 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 );
+
+  // Fails as expected
+  test fail_construction( 1, 2, 3, 4, 5 );
+
+  // Works by calling the conversion operator enabled for arithmetic types
+  int arithmetic_object = test_;
+
+  // Works by calling the conversion operator enabled for pointer types
+  int* pointer_object = test_;
+
+  // Fails as expected
+  struct {} fail_conversion = test_;
+}
+
+</PRE>
+
 <!--TOC subsection Enabling template class specializations-->
 
-<H3><A NAME="htoc6">3.1</A>&nbsp;&nbsp;Enabling template class specializations</H3><!--SEC END -->
+<H3><A NAME="htoc7">3.2</A>&nbsp;&nbsp;Enabling template class specializations</H3><!--SEC END -->
 
 <A NAME="sec:enable_if_classes"></A>
 Class template specializations can be enabled or disabled with <TT>enable_if</TT>.
@@ -210,7 +285,7 @@ is the correct value.<BR>
 <BR>
 <!--TOC subsection Overlapping enabler conditions-->
 
-<H3><A NAME="htoc7">3.2</A>&nbsp;&nbsp;Overlapping enabler conditions</H3><!--SEC END -->
+<H3><A NAME="htoc8">3.3</A>&nbsp;&nbsp;Overlapping enabler conditions</H3><!--SEC END -->
 
 <A NAME="sec:overlapping_conditions"></A>
 Once the compiler has examined the enabling conditions and included the
@@ -239,7 +314,7 @@ partial specializations as well.<BR>
 <BR>
 <!--TOC subsection Lazy <TT>enable_if</TT>-->
 
-<H3><A NAME="htoc8">3.3</A>&nbsp;&nbsp;Lazy <TT>enable_if</TT></H3><!--SEC END -->
+<H3><A NAME="htoc9">3.4</A>&nbsp;&nbsp;Lazy <TT>enable_if</TT></H3><!--SEC END -->
 
 <A NAME="sec:enable_if_lazy"></A>
 In some cases it is necessary to avoid instantiating part of a
@@ -285,7 +360,7 @@ above example, <TT>is_multipliable&lt;T, U&gt;::value</TT> defines when
 <BR>
 <!--TOC subsection Compiler workarounds-->
 
-<H3><A NAME="htoc9">3.4</A>&nbsp;&nbsp;Compiler workarounds</H3><!--SEC END -->
+<H3><A NAME="htoc10">3.5</A>&nbsp;&nbsp;Compiler workarounds</H3><!--SEC END -->
 
 <A NAME="sec:workarounds"></A>
 Some compilers flag functions as ambiguous if the only distinguishing factor is a different 
@@ -367,9 +442,9 @@ David Vandevoorde and Nicolai&nbsp;M. Josuttis.
 Addison-Wesley, 2002.</DL>
 
 <hr/>
-   <p>Copyright Jaakko J&auml;rvi, Jeremiah Willcock and Andrew Lumsdaine<BR>
+   <p>Copyright Jaakko J&auml;rvi<sup>*</sup>, Jeremiah Willcock<sup>*</sup>, Andrew Lumsdaine<sup>*</sup>, Matt Calabrese<BR>
-<EM>{jajarvi|jewillco|lums}@osl.iu.edu</EM><BR>
+<EM>{jajarvi|jewillco|lums}@osl.iu.edu, rivorus@gmail.com</EM><BR>
-Indiana University<BR>
+<sup>*</sup>Indiana University<BR>
 Open Systems Lab<br/>
 Use, modification and distribution are subject to the
 Boost Software License, Version 1.0.

include/boost/current_function.hpp

@@ -28,7 +28,7 @@ namespace detail
 inline void current_function_helper()
 {
 
-#if defined(__GNUC__) || (defined(__MWERKS__) && (__MWERKS__ >= 0x3000)) || (defined(__ICC) && (__ICC >= 600))
+#if defined(__GNUC__) || (defined(__MWERKS__) && (__MWERKS__ >= 0x3000)) || (defined(__ICC) && (__ICC >= 600)) || defined(__ghs__)
 
 # define BOOST_CURRENT_FUNCTION __PRETTY_FUNCTION__
 
@@ -65,3 +65,4 @@ inline void current_function_helper()
 } // namespace boost
 
 #endif // #ifndef BOOST_CURRENT_FUNCTION_HPP_INCLUDED
+

include/boost/operators.hpp

@@ -8,6 +8,8 @@
 //  See http://www.boost.org/libs/utility/operators.htm for documentation.
 
 //  Revision History
+//  16 Dec 10 Limit warning suppression for 4284 to older versions of VC++
+//            (Matthew Bradbury, fixes #4432)
 //  07 Aug 08 Added "euclidean" spelling. (Daniel Frey)
 //  03 Apr 08 Make sure "convertible to bool" is sufficient
 //            for T::operator<, etc. (Daniel Frey)
@@ -88,7 +90,7 @@
 #   pragma set woff 1234
 #endif
 
-#if defined(BOOST_MSVC)
+#if BOOST_WORKAROUND(BOOST_MSVC, < 1600)
 #   pragma warning( disable : 4284 ) // complaint about return type of 
 #endif                               // operator-> not begin a UDT
 

include/boost/utility/detail/result_of_iterate.hpp

@@ -35,10 +35,7 @@ struct tr1_result_of<F(BOOST_RESULT_OF_ARGS)>
 
 #if !defined(BOOST_NO_DECLTYPE) && defined(BOOST_RESULT_OF_USE_DECLTYPE)
 
-// As of N2588, C++0x result_of only supports function call
+// Uses declval following N3225 20.7.7.6 when F is not a pointer.
-// expressions of the form f(x). This precludes support for member
-// function pointers, which are invoked with expressions of the form
-// o->*f(x). This implementation supports both.
 template<typename F BOOST_PP_COMMA_IF(BOOST_PP_ITERATION())
          BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(),typename T)>
 struct result_of<F(BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(),T))>
@@ -56,18 +53,15 @@ struct result_of<F(BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(),T))>
 
 namespace detail {
 
-# define BOOST_RESULT_OF_STATIC_MEMBERS(z, n, _) \
-     static T ## n t ## n; \
-  /**/
-
 template<typename F BOOST_PP_COMMA_IF(BOOST_PP_ITERATION())
          BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(),typename T)>
-class cpp0x_result_of_impl<F(BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(),T))>
+struct cpp0x_result_of_impl<F(BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(),T))>
 {
-  static F f;
+  typedef decltype(
-  BOOST_PP_REPEAT(BOOST_PP_ITERATION(), BOOST_RESULT_OF_STATIC_MEMBERS, _)
+    boost::declval<F>()(
-public:
+      BOOST_PP_ENUM_BINARY_PARAMS(BOOST_PP_ITERATION(), declval<T, >() BOOST_PP_INTERCEPT)
-  typedef decltype(f(BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(),t))) type;
+    )
+  ) type;
 };
 
 } // namespace detail 

include/boost/utility/result_of.hpp

@@ -13,7 +13,9 @@
 #include <boost/preprocessor/iteration/iterate.hpp> 
 #include <boost/preprocessor/punctuation/comma_if.hpp> 
 #include <boost/preprocessor/repetition/enum_params.hpp> 
+#include <boost/preprocessor/repetition/enum_binary_params.hpp> 
 #include <boost/preprocessor/repetition/enum_shifted_params.hpp> 
+#include <boost/preprocessor/facilities/intercept.hpp> 
 #include <boost/detail/workaround.hpp>
 #include <boost/mpl/has_xxx.hpp>
 #include <boost/mpl/if.hpp>
@@ -22,6 +24,7 @@
 #include <boost/type_traits/is_pointer.hpp>
 #include <boost/type_traits/is_member_function_pointer.hpp>
 #include <boost/type_traits/remove_cv.hpp>
+#include <boost/utility/declval.hpp>
 
 #ifndef BOOST_RESULT_OF_NUM_ARGS
 #  define BOOST_RESULT_OF_NUM_ARGS 10

test/result_of_test.cpp

@@ -98,6 +98,11 @@ struct no_result_type_or_result_of
   unsigned int operator()();
   unsigned short operator()() volatile;
   const unsigned short operator()() const volatile;
+#if !defined(BOOST_NO_RVALUE_REFERENCES)
+  short operator()(int&&);
+  int operator()(int&);
+  long operator()(int const&);
+#endif
 };
 
 template<typename T>
@@ -108,6 +113,11 @@ struct no_result_type_or_result_of_template
   unsigned int operator()();
   unsigned short operator()() volatile;
   const unsigned short operator()() const volatile;
+#if !defined(BOOST_NO_RVALUE_REFERENCES)
+  short operator()(int&&);
+  int operator()(int&);
+  long operator()(int const&);
+#endif
 };
 
 struct X {};
@@ -232,6 +242,14 @@ int main()
   BOOST_STATIC_ASSERT((is_same<result_of<const no_result_type_or_result_of_template<void>(double)>::type, short>::value));
   BOOST_STATIC_ASSERT((is_same<result_of<volatile no_result_type_or_result_of_template<void>(void)>::type, unsigned short>::value));
   BOOST_STATIC_ASSERT((is_same<result_of<const volatile no_result_type_or_result_of_template<void>(void)>::type, const unsigned short>::value));
+#if !defined(BOOST_NO_RVALUE_REFERENCES)
+  BOOST_STATIC_ASSERT((is_same<result_of<no_result_type_or_result_of(int&&)>::type, short>::value));
+  BOOST_STATIC_ASSERT((is_same<result_of<no_result_type_or_result_of(int&)>::type, int>::value));
+  BOOST_STATIC_ASSERT((is_same<result_of<no_result_type_or_result_of(int const&)>::type, long>::value));
+  BOOST_STATIC_ASSERT((is_same<result_of<no_result_type_or_result_of_template<void>(int&&)>::type, short>::value));
+  BOOST_STATIC_ASSERT((is_same<result_of<no_result_type_or_result_of_template<void>(int&)>::type, int>::value));
+  BOOST_STATIC_ASSERT((is_same<result_of<no_result_type_or_result_of_template<void>(int const&)>::type, long>::value));
+#endif
 #endif
 
   return 0;

utility.htm

@@ -224,6 +224,20 @@ typedef boost::result_of<
 &gt;::type type;</pre>
                 </blockquote>
 
+                <p>In a future
+                release, <code>BOOST_RESULT_OF_USE_DECLTYPE</code>
+                may be enabled by default on compilers that
+                support <code>decltype</code>, so if you use the above
+                protocol please take care to ensure that
+                the <code>result_type</code>
+                and <code>result&lt;&gt;</code> members accurately
+                represent the result type. If you wish to continue to
+                use the protocol on compilers that
+                support <code>decltype</code>,
+                use <code>boost::tr1_result_of</code>, which is also
+                defined
+                in <code>&lt;<a href="../../boost/utility/result_of.hpp">boost/utility/result_of.hpp</a>&gt;</code>.</p>
+
                 <a name="BOOST_NO_RESULT_OF"></a>
                 <p>This implementation of <code>result_of</code>
                 requires class template partial specialization, the