What happens when you attempt to compile and run the following code?
#include <deque>
#include <set>
#include <iostream>
#include <algorithm>
using namespace std;
class B { int val;
public:
B(int v):val(v){}
int getV() const {return val;} bool operator < (const B & v) const { return val<v.val;} }; ostream & operator <<(ostream & out, const B & v) { out<<v.getV(); return out;} template<class T>struct Out { ostream & out; Out(ostream & o): out(o){} void operator() (const T & val ) { out<<val<<" "; } }; int main() { int t[]={8, 10, 5, 1, 4, 6, 2, 7, 9, 3}; deque<B> d1(t, t+10); sort(d1.begin(), d1.end()); set<B> s1(t,t+10); cout<<binary_search(s1.begin(),s1.end(), B(4))<<" "<<binary_search(d1.begin(),d1.end(), B(4))
<<endl;
return 0;
}
Program outputs: