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Compiler Error C2884

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'name' : introduced by using-declaration conflicts with local function 'function'

You tried to define a function more than once. The first definition is a local definition. The second is from a namespace with a using declaration.

The following sample generates C2884:

// C2884.cpp
namespace A {
   void z(int);
}

void f() {
   void z(int);
   using A::z;   // C2884 z is already defined
}