using map item without assigning onw first?

[Gernot Frisch]

Can I do this:

std::map<long, std::vector<long>> snapmap;
long i=4, j=0;
snapmap[j].push_back(i);


--
-Gernot
int main(int argc, char** argv) {printf
("%silto%c%cf%cgl%ssic%ccom%c", "ma", 58, 'g', 64, "ba", 46, 10);}

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[John Harrison]

Can I do this:

std::map<long, std::vector<long>> snapmap;
long i=4, j=0;
snapmap[j].push_back(i);

Yes, using snapmap[j] will create a map entry using the default constructor
for std::vector<long>. You then push back i onto that empty vector.

john