Function: Merge from trunk.

- Remove extra definition of operator(), since it's inline anyway.  Fixes
  #4765.
- Make sure that the cv flags are copied when we copy a reference to a function
  object.  Fixes #4325
- Fully qualified function calls to avoid ambiguity with new additions to
  standard. Thanks to Conrad Poelman. Fixes #4073
- Remove iterator workaround for newer versions of Visual Age C++. Thanks to
  'ccambly'. Fixes #3912
- Fix unused variable warning for Visual C++. Fixes #3618
- Testing flag for Visual C++.
- Removed all but one old-style cast, prevents GCC warnings, but breaks GCC
  2.95.3. Fixes #3410
- Fixed tab and newline issues from inspection report.



[SVN r70361]

test/mem_fun_cxx98.cpp

@@ -10,22 +10,28 @@
 
     
 #include <boost/function.hpp>
+#include <boost/detail/lightweight_test.hpp>
 #include <iostream>
 #include <functional>
 
 struct X {
   int foo(int);
+  std::ostream& foo2(std::ostream&) const;
 };
 int X::foo(int x) { return -x; }
+std::ostream& X::foo2(std::ostream& x) const { return x; }
 
 int main()
 {
     boost::function<int (X*, int)> f;
+    boost::function<std::ostream& (X*, std::ostream&)> f2;
 
-f = &X::foo;
-  
-X x;
-f(&x, 5);
+    f = &X::foo;
+    f2 = &X::foo2;
 
-    return 0;
+    X x;
+    BOOST_TEST(f(&x, 5) == -5);
+    BOOST_TEST(f2(&x, boost::ref(std::cout)) == std::cout);
+
+    return ::boost::report_errors();
 }