[Boost-users] member selector adapter

From: Nico Galoppo (nico_at_[hidden])
Date: 2006-02-25 17:31:08

Hi,

is there some utility (templated) adapter type class that I could use to 
construct an adapter such that an (associative) array of (pointers to) objects 
behaves like an (associative) array of a member variable of the objects? 
Something like

class A {
   int val;
};

std::map<int, shared_ptr<A> > container_type;
container_type amap;

shared_ptr<A> elem(new A());

amap[2] = elem;
amap[4] = elem;
amap[6] = elem;

selector_adapter<container_type, &A::val> val_container(&amap);
std::cout << val_container[4]; // should output amap[4]->val;

--nico

-- 
nico galoppo von borries     @  address: 105 creel st., chapel hill
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