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#include <boost/phoenix/bind/bind_member_variable.hpp>
          Member variables can also be bound much like member functions. Member variables
          are not functions. Yet, like the ref(x)
          that acts like a nullary function returning a reference to the data, member
          variables, when bound, act like a unary function, taking in a pointer or
          reference to an object as its argument and returning a reference to the
          bound member variable. For instance, given:
        
struct xyz { int v; };
          xyz::v can be bound as:
        
bind(&xyz::v, obj) // obj is an xyz object
As noted, just like the bound member function, a bound member variable also expects the first (and only) argument to be a pointer or reference to an object. The object (reference or pointer) can be lazily bound. Examples:
xyz obj; bind(&xyz::v, arg1) // arg1.v bind(&xyz::v, obj) // obj.v bind(&xyz::v, arg1)(obj) = 4 // obj.v = 4