vector<int>初始化的问题

#include<iostream>
#include<vector>
using namespace std;
bool search_vec(vector<int>::iterator beg,vector<int>::iterator end,int val)
{
for(;beg!=end;beg++)
if(*beg==val)
return true;
return false;
}
int main()
{
vector<int> ilist;
ilist.push_back(1);
ilist.push_back(2);
ilist.push_back(3);
ilist.push_back(4);
ilist.push_back(5);
ilist.push_back(6);
ilist.push_back(7);


cout<<search_vec(ilist.begin(),ilist.end(),3)<<endl;
cout<<search_vec(ilist.begin(),ilist.end(),8)<<endl;
return 0;
}