I want to achieve something like this with boost multi_index_container and composite_key:
struct LogicalAnd {
bool operator()(const int& argVal1, const int& argVal2) const {
return int(argVal1 & argVal2) == argVal1;
}
};
template<class T, class Enable = void>
class FooContainer;
template <class T>
struct FooContainer<T,typename boost::enable_if<boost::is_base_of<IFoo, T> >::type> {
typedef multi_index_container<
boost::shared_ptr<T>,
indexed_by<
hashed_non_unique<
composite_key<
T,
const_mem_fun<T,int,&T::getKey1>,
const_mem_fun<T,int,&T::getKey2>
>,
composite_key_equal_to<
LogicalAnd,
LogicalAnd
>
>
>
> shared_ptr_type;
};
Knowing that:
namespace CustomKey {
typedef enum {
VAL1 = 0x00000001,
VAL2 = 0x00000002,
ALL = 0xFFFFFFFF
} type;
}
The goal is to be able to perform the following:
container.find(boost::make_tuple(CustomKey::VAL1, CustomKey::ALL));
Which would allow me to retrieve all elements for which LogicalAnd returns true.
The problem is that I can't manage to get my LogicalAnd comparator to work with my multi_index_container.
I can get it to build by adding a composite_key_hash right before composite_key_equal_to:
composite_key_hash<
boost::hash<int>,
boost::hash<int>
>
But find operation does not work as expected so it does not change much...
I've searched boost documentation, and I've tryed various implementations, but I'm getting drown in the amount of information...
Any help is appreciated!
findnot work as expected? – Useless May 2 at 10:55composite_key_hash, but I would expect find to return an item which matches myLogicalAnd::operator. Unfortunatelly, as demonstrated in the linked code, it doesn't work becausefinddoes not return any entry. – Syffys May 2 at 14:34