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Message: [QUOTE="Jeff Schwab, post: 3450757"] That's a neat idea. It could probably be made a little more efficient by replacing the calls to map::operator[] with calls to map::find and map::insert. If the OP is willing to have two statements rather than one, a copy of the map's data can also be saved by adding a swap function: template<typename K, typename V> struct map_initializer_proxy { // ... void swap(std::map<K, V>& m) { map_.swap(m); } }; int main() { std::map<int, int> m; map_initializer(3,4)(5,6)(7,8).swap(m); } This is admittedly not as nifty, since it's not really an initialization. It's more like a map_filler. [/QUOTE]