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here's how you remove items from a vector:

vector<Rect>::iterator itc= rects.begin();
while (itc!=rects.end()) {
    if( NOT_A_HUMAN(*itc)) { // (*itc) is a Rect
        // erase needs an iterator, also be careful to use the returned iterator,
        //  not the previous one (that will be invalid)
        itc = rects.erase(itc); 
    }else{
        ++itc;
    }
}