unique_ptr1.cpp

// Create a unique pointer
auto p1 = std::make_unique<int>(42);
// Error to copy
auto p2 = p1;
// Ok to move
auto p2 = std::move(p1);
// After being moved, p1 is guaranted be equal to nullptr
assert(p1 == nullptr);
// It's a runtime error to access p1
int x = *p1;