stdmap - Map lookup using boost::tuple as key -

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i understand how key in form of boost::tuple looked in map, compare=std::less. instance, snippet of code i'm working on:

typedef boost::tuple<std::string, std::string> key; void *data;  typedef std::map<key, data> filedatamap; filedatamap file_map;  lookup_data(std::string s1, std::string s2) {     ...     fk = boost::make_tuple(s1, s2);      filedatamap::iterator itr = file_map.find(fk);     ...     ... }  insert_data(std::string s1, std::string s2, void *fdata) {     ...     fk = boost::make_tuple(s1, s2);     file_map.insert(std::make_pair(fk, fdata));     ...     ... }

at time of inserting value map, let's suppose s1 abc , s2 xyz. during lookup, how key match determined?

is string comparison of s1 , s2 done abc , xyz respectively, individually? if so, std::string comparison operators used?

thanks!

i wrote code test out. testing indicates strings indeed compared individually using defined comparison operators.

the document talks on similar lines: http://en.cppreference.com/w/cpp/utility/tuple/operator_cmp


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