[Note: the ability to omit the return type is not available on all compilers.]
+By default, bind makes a copy of the provided function object.
+ boost::ref and boost::cref can be used to make it store
+ a reference to the function object, rather than a copy. This can be useful when
+ the function object is noncopyable, expensive to copy, or contains state; of
+ course, in this case the programmer is expected to ensure that the function
+ object is not destroyed while it's still being used.
struct F2
+{
+ int s;
+
+ typedef void result_type;
+ void operator()( int x ) { s += x; }
+};
+
+F2 f2 = { 0 };
+int a[] = { 1, 2, 3 };
+
+std::for_each( a, a+3, bind( ref(f2), _1 ) );
+
+assert( f2.s == 6 );
+
Pointers to member functions and pointers to data members are not function objects, because they do not support operator(). For convenience, bind @@ -859,7 +880,7 @@ namespace by Jaakko Järvi;