Patch for GCC-4.0.1 compatibility (and better compile time).

[Dave Abrahams]

This patch makes the tests build on GCC-4.0.1 and leaves out what I believe to be the unnecessary step of checking whether a metafunction class is actually a placeholder expression. If I'm understanding correcetly, it will always be a metafunction class, and not just in the tested examples.

Note that this patch is against 1.35.x; I know things have been shuffled for 1.36 but I assume the same transformation can be applied elsewhere.

boost/archive/array/iarchive.hpp

@@ -108 +108 @@
   template<class ValueType>
   void load_override(serialization::array<ValueType> const& x, unsigned int version)
   {
-    typedef typename mpl::apply1<
+    typedef typename mpl::apply_wrap1<
         BOOST_DEDUCED_TYPENAME Archive::use_array_optimization
       , ValueType
     >::type use_optimized;

boost/archive/array/oarchive.hpp

@@ -107 +107 @@
   template<class ValueType>
   void save_override(serialization::array<ValueType> const& x, unsigned int version)
   {
-    typedef typename mpl::apply1<
+    typedef typename mpl::apply_wrap1<
         BOOST_DEDUCED_TYPENAME Archive::use_array_optimization
       , BOOST_DEDUCED_TYPENAME remove_const<ValueType>::type
     >::type use_optimized;

[Robert Ramey]

matthias - could you look at this please?

[Matthias Troyer]

I'm closing this since the offending code has been rewritten in the meantime but will keep the fix in mind if it should reappear.