Branch at revision 46530

[SVN r46531]

doc/static_assert.qbk

@@ -15,6 +15,10 @@
     [last-revision $Date$]
 ]
 
+This manual is also available in 
+[@http:svn.boost.org/svn/boost/sandbox/pdf/static_assert/release/static_assert.pdf 
+printer friendly PDF format].
+
 [section:intro Overview and Tutorial]
 
 The header `<boost/static_assert.hpp>` supplies a single macro `BOOST_STATIC_ASSERT(x)`, 
@@ -94,12 +98,17 @@ the user that the template is being misused.
    #include <boost/type_traits.hpp>
 
    template <class RandomAccessIterator >
-   RandomAccessIterator foo(RandomAccessIterator from, RandomAccessIterator to)
+   RandomAccessIterator foo(RandomAccessIterator from, 
+                            RandomAccessIterator to)
    {
       // this template can only be used with
       // random access iterators...
-      typedef typename std::iterator_traits< RandomAccessIterator >::iterator_category cat;
-      BOOST_STATIC_ASSERT((boost::is_convertible<cat, const std::random_access_iterator_tag&>::value));
+      typedef typename std::iterator_traits< 
+            RandomAccessIterator >::iterator_category cat;
+      BOOST_STATIC_ASSERT(
+         (boost::is_convertible<
+            cat, 
+            const std::random_access_iterator_tag&>::value));
       //
       // detail goes here...
       return from;

include/boost/static_assert.hpp

@@ -28,6 +28,16 @@
 #  define BOOST_SA_GCC_WORKAROUND
 #endif
 
+//
+// If the compiler issues warnings about old C style casts,
+// then enable this:
+//
+#if defined(__GNUC__) && ((__GNUC__ > 3) || ((__GNUC__ == 3) && (__GNUC_MINOR__ >= 4)))
+#  define BOOST_STATIC_ASSERT_BOOL_CAST( x ) ((x) == 0 ? false : true)
+#else
+#  define BOOST_STATIC_ASSERT_BOOL_CAST(x) (bool)(x)
+#endif
+
 #ifdef BOOST_HAS_STATIC_ASSERT
 #  define BOOST_STATIC_ASSERT( B ) static_assert(B, #B)
 #else
@@ -78,14 +88,14 @@ template<int x> struct static_assert_test{};
 #elif defined(BOOST_MSVC)
 #define BOOST_STATIC_ASSERT( B ) \
    typedef ::boost::static_assert_test<\
-      sizeof(::boost::STATIC_ASSERTION_FAILURE< (bool)( B ) >)>\
+      sizeof(::boost::STATIC_ASSERTION_FAILURE< BOOST_STATIC_ASSERT_BOOL_CAST ( B ) >)>\
          BOOST_JOIN(boost_static_assert_typedef_, __COUNTER__)
 #elif defined(BOOST_INTEL_CXX_VERSION) || defined(BOOST_SA_GCC_WORKAROUND)
 // agurt 15/sep/02: a special care is needed to force Intel C++ issue an error 
 // instead of warning in case of failure
 # define BOOST_STATIC_ASSERT( B ) \
     typedef char BOOST_JOIN(boost_static_assert_typedef_, __LINE__) \
-        [ ::boost::STATIC_ASSERTION_FAILURE< (bool)( B ) >::value ]
+        [ ::boost::STATIC_ASSERTION_FAILURE< BOOST_STATIC_ASSERT_BOOL_CAST( B ) >::value ]
 #elif defined(__sgi)
 // special version for SGI MIPSpro compiler
 #define BOOST_STATIC_ASSERT( B ) \
@@ -100,12 +110,12 @@ template<int x> struct static_assert_test{};
 #define BOOST_STATIC_ASSERT( B ) \
    BOOST_STATIC_CONSTANT(int, \
      BOOST_JOIN(boost_static_assert_test_, __LINE__) = \
-       sizeof(::boost::STATIC_ASSERTION_FAILURE< (bool)( B ) >) )
+       sizeof(::boost::STATIC_ASSERTION_FAILURE< BOOST_STATIC_ASSERT_BOOL_CAST( B ) >) )
 #else
 // generic version
 #define BOOST_STATIC_ASSERT( B ) \
    typedef ::boost::static_assert_test<\
-      sizeof(::boost::STATIC_ASSERTION_FAILURE< (bool)( B ) >)>\
+      sizeof(::boost::STATIC_ASSERTION_FAILURE< BOOST_STATIC_ASSERT_BOOL_CAST( B ) >)>\
          BOOST_JOIN(boost_static_assert_typedef_, __LINE__)
 #endif