add a unique_ptr test

unique_ptr.cpp

@@ -0,0 +1,18 @@
+#include <cassert>
+#include <iostream>
+#include <memory>
+#include <vector>
+
+int main(void) {
+  std::vector<std::unique_ptr<int>> v;
+  std::unique_ptr<int> q(new int(42));
+
+  assert(q != NULL);
+  // v.push_back(q);
+  v.push_back(std::move(q));
+  assert(q == NULL);
+
+  for(auto &e: v) {
+    std::cout << *e << std::endl;
+  }
+}