#include <iostream> #include <cassert> #include <vector> using namespace std; class MyClass { public: unsigned long id; MyClass() : id(0) { } MyClass(unsigned long x) : id(x) { } }; bool operator==(const MyClass& x, const MyClass& y) { return x.id == y.id; } bool operator!=(const MyClass& x, const MyClass& y) { return x.id != y.id; } int main() { vector<MyClass> vector1, vector2(3); assert (vector1.size() == 0); assert (vector2.size() == 3); assert (vector2[0] == MyClass() && vector2[1] == MyClass() &&vector2[2] == MyClass()); assert (vector2 == vector<MyClass>(3, MyClass())); return 0; }