Mega Code Archive
Demonstrating STL vector constructors with a user-defined type
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#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;
}
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