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vector->at(i) ?
Posted: Sat Mar 05, 2005 12:15 pm
by mbkt
Hi, I have submited a solution which uses the function vector::at(int) and i got CE...
What am i doing wrong? this simple code causes a Compile Error:
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#include <vector>
int main(){
vector<int>* vc = new vector<int>();
return vc->at(0);
}
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no matching function for call to `vector<int,allocator<int> >::at (int)
Help me plz!
Posted: Sat Mar 05, 2005 12:59 pm
by Krzysztof Duleba
LOL! Don't you understand "no matching function for call to `vector<int,allocator<int> >::at (int)"?
Let me explain it: in judge's g++ 2.95, there is no matching function for call to vector<>::at (int).
You have to use operator[] instead.
Posted: Sat Mar 05, 2005 1:11 pm
by mbkt
Yes, i understand it, i also tried using operator [] but it's a vector<>*, so i cannot call operator [], then i get CE too:
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class vector<int,allocator<int> >' used where a `int' was expected
There's some way i can use that operator in a pointer type?
(Sorry, but i'm quite new in C++...)
Thanks for helping!
Posted: Sat Mar 05, 2005 3:48 pm
by Aleksandrs Saveljevs
You can do it like this: "(*p)[1]". For example,
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vector<int>* p;
p=new vector<int>();
p->push_back(4);
p->push_back(8);
printf("%d\n", (*p)[1]);
delete p;
Posted: Sat Mar 05, 2005 7:26 pm
by mbkt
It works! Thanks a lot!
