Hi, Jeremiah. Thanks for your reply.
The declaration "PMap map();" declares a function named "map" that returns an object of type "PMap". Just use the original form "PMap map;" if you want to declare an actual map.
You are right. What a stupid mistake I make, probably I've been writing Python for too long time :-). As for the original form do you have some speculation on why it's crashing? After I surf on the Internet for a while, I found a solution to the crashing problem by change the program into: #include <iostream> #include <map> #include <string> #include <boost/property_map/property_map.hpp> using std::string; using boost::put; using boost::get; int main() { typedef std::map<std::string, int> Map; typedef boost::associative_property_map<Map> PMap; Map tmp; PMap map(tmp); put(map, string("acc"), 1); get(map, string("acc")); return EXIT_SUCCESS; } -- Yaohua Xiong Traffic and Transportation Engineering College, Tongji Univ. Cao An Road 4800#, Jia Ding District, Shanghai, China