In the standard (section 7.3.3 para 8) the following  is given:

Definitions added to the namespace after the using-declaration are not
considered when a use of the name is made:

namespace A { void f(int); }
using A::f;
namespace A { void f(char); }
void foo()
{ f('a'); } //  calls f(int)

In 7.3.5 para 5 (part of the example is removed)

namespace D {   void f(char) ; }
using namespace D;
namespace D { void f(int); int d2;}
void f() { f('a');  // calls f(char)
                d2++; // OK
              }


What the rationale for the difference in behavior between the
using-directive and the using-declaration?
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