Subject: Re: [Boost-users] Multi Index: Nested std::pair
From: Etienne Philip Pretorius (icewolfhunter_at_[hidden])
Date: 2009-04-26 19:48:28
Hello List,
Continuing from the last post.. I have the following defined:
struct element_t {
element_t(
unsigned char value,
unsigned char x,
unsigned char y
):value(value),x(x),y(y){}
unsigned char value;
unsigned char x;
unsigned char y;
};
typedef boost::multi_index_container<
element_t,
boost::multi_index::indexed_by<
/*value*/
boost::multi_index::ordered_non_unique<
boost::multi_index::member<
element_t,
unsigned char,
&element_t::value
>
>,
/*x co-ordinate*/
boost::multi_index::ordered_non_unique<
boost::multi_index::member<
element_t,
unsigned char,
&element_t::x
>
>,
/*y co-ordinate*/
boost::multi_index::ordered_non_unique<
boost::multi_index::member<
element_t,
unsigned char,
&element_t::y
>
>,
/*unique values per x co-ordinate*/
boost::multi_index::ordered_non_unique<
boost::multi_index::composite_key<
element_t,
boost::multi_index::member<
element_t,
unsigned char,
&element_t::x
>,
boost::multi_index::member<
element_t,
unsigned char,
&element_t::value
>
>
>
>
> matrix_t;
How would I define the "unique values per x co-ordinate" as there x
co-ordinate is suppose to be non unique while value in this key should
ONLY point to unique instances within that x co-ordinate?
Many Thanks,
Etienne