STL set intersection question

[Phil]

Hello,

I'm trying to get the result of a set intersection and I'm sure that I've
made a very basic error.

A Google search has helped but I'm still not quite there. Can someone show
me the error?

set<int> firstSet;

secondSet.insert(1);
secondSet.insert(2);

set<int> secondSet;

secondSet.insert(2);

set<int> resultSet;

resultSet = set_intersection(firstSet.begin(), firstSet.end(),
secondSet.begin(), secondSet.end(), resultSet.begin());

 

[joosteto]

Hello,

I'm trying to get the result of a set intersection and I'm sure that I've
made a very basic error.

A Google search has helped but I'm still not quite there. Can someone show
me the error?

set<int> firstSet;

secondSet.insert(1);
secondSet.insert(2);

set<int> secondSet;

secondSet.insert(2);

set<int> resultSet;

resultSet = set_intersection(firstSet.begin(), firstSet.end(),
secondSet.begin(), secondSet.end(), resultSet.begin());

This does seem to compile:
vector<int> vi;
set_intersection(firstSet.begin(), firstSet.end(),
secondSet.begin(), secondSet.end(),
vi.begin());