major boost update

[lyx.git] / boost / boost / static_assert.hpp

diff --git a/boost/boost/static_assert.hpp b/boost/boost/static_assert.hpp
index af421736e3e960ed8acc278d4ca565e5436af5d0..4ba29d71eee68fdabbd65134c2838a8963abb20c 100644 (file)
--- a/boost/boost/static_assert.hpp
+++ b/boost/boost/static_assert.hpp
@@ -8,8 +8,8 @@
 
 /*
  Revision history:
-       02 August 2000
-               Initial version.
+   02 August 2000
+      Initial version.
 */
 
 #ifndef BOOST_STATIC_ASSERT_HPP
@@ -53,13 +53,16 @@ template<int x> struct static_assert_test{};
 // an eye catching error message.  The result of the sizeof expression is either
 // used as an enum initialiser, or as a template argument depending which version
 // is in use...
+// Note that the argument to the assert is explicitly cast to bool using old-
+// style casts: too many compilers currently have problems with static_cast
+// when used inside integral constant expressions.
 //
 #if !defined(BOOST_BUGGY_INTEGRAL_CONSTANT_EXPRESSIONS) && !defined(__MWERKS__)
 #ifndef BOOST_MSVC
 #define BOOST_STATIC_ASSERT( B ) \
    typedef ::boost::static_assert_test<\
       sizeof(::boost::STATIC_ASSERTION_FAILURE< (bool)( B ) >)>\
-         BOOST_ASSERT_JOIN(boost_static_assert_typedef_, __LINE__)
+         BOOST_JOIN(boost_static_assert_typedef_, __LINE__)
 #else
 // __LINE__ macro broken when -ZI is used see Q199057
 // fortunately MSVC ignores duplicate typedef's.
@@ -71,19 +74,10 @@ template<int x> struct static_assert_test{};
 #else
 // alternative enum based implementation:
 #define BOOST_STATIC_ASSERT( B ) \
-   enum { BOOST_ASSERT_JOIN(boost_static_assert_enum_, __LINE__) \
+   enum { BOOST_JOIN(boost_static_assert_enum_, __LINE__) \
       = sizeof(::boost::STATIC_ASSERTION_FAILURE< (bool)( B ) >) }
 #endif
 
-//
-// The following piece of macro magic joins the two 
-// arguments together, even when one of the arguments is
-// itself a macro (see 16.3.1 in C++ standard).  The key
-// is that macro expansion of macro arguments does not
-// occur in BOOST_DO_ASSERT_JOIN but does in BOOST_ASSERT_JOIN
-// provided it is called from within another macro.
-#define BOOST_ASSERT_JOIN( X, Y ) BOOST_DO_ASSERT_JOIN( X, Y )
-#define BOOST_DO_ASSERT_JOIN( X, Y ) X##Y
 
 #endif // BOOST_STATIC_ASSERT_HPP