Bill Tian
hello,every one now i have a struct like this
struct a { a(const std::string &m1_, const std::string &m2_, boost::int16_t m3_) : m1(m1_),m2(m2_), m3(m3_) {} std::string m1; std::string m2;
boost::int16_t m3; };
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i want to get all data that m2 equal to "k1", when this data has been processed, get all data that m2 equal to "k2" ... but i do not how many unique keys in the container, am i need to store another set to store that when i fill the container? i need a function to get the keys like the SQL:"select distinct(m2) from data".
Something like that will do? for(auto it=data.get<1>().begin(),it_end=data.get<1>().end(); it!=it_end; it=data.get<1>().upper_bound(it->m2)){ std::cout<<it->m2<<"\n"; // or whatever you need to do with the key } Hope this helps, Joaquín M López Muñoz Telefónica