diff --git a/.drone.yml b/.drone.yml
index 6b04d72..70581d4 100644
--- a/.drone.yml
+++ b/.drone.yml
@@ -1,8 +1,12 @@
 kind: pipeline
 name: default
 steps:
-- name: test
-  image: gcc:latest
-  commands:
-  - gcc hello.c -o hello
-  - ./hello
\ No newline at end of file
+  - name: test
+    image: gcc:latest
+    commands:
+      - echo "*****hello*****"
+      - gcc hello.cpp -o hello && ./hello
+
+      - cd class || exit
+      - echo "*****construct*****"
+      - gcc construct.cpp -o construct && ./construct
diff --git a/class/construct.cpp b/class/construct.cpp
new file mode 100644
index 0000000..8e52695
--- /dev/null
+++ b/class/construct.cpp
@@ -0,0 +1,81 @@
+#include <iostream>
+
+using namespace std;
+
+class A {
+   public:
+    A(int) {
+        cout << "A constructed at " << this << " with " << i << " at " << &i << endl;
+        this->i = i;
+    }
+    A() {
+        cout << "A constructed at " << this << endl;
+        this->i = 0;
+    }
+    A& operator=(const A& a) {
+        cout << "A assign constructed at " << this << " with a at " << &a << endl;
+        return *this;
+    }
+    ~A() { cout << "A destructed at " << this << " with val " << i << endl; }
+
+   private:
+    int i;
+};
+
+class Uniq {
+   public:
+    Uniq() {}
+    void copy(Uniq& from) { *this = from; }
+    void setVal(int val) { this->val = val; }
+    int getVal() { return val; }
+
+   private:
+    Uniq(const Uniq&);
+    Uniq& operator=(const Uniq& from) {
+        cout << "Uniq hidden copy assign func called" << endl;
+        val = from.val;
+        return *this;
+    }
+    int val;
+};
+
+class Empty {
+   public:
+    Empty() { cout << "Empty constructed at " << this << endl; }
+    ~Empty() { cout << "Empty destructed at " << this << endl; };
+};
+
+class B {
+   private:
+    int i;
+    A a;
+
+   public:
+    B(A a)
+        : a(a) {
+        cout << "B constructed at " << this << " with A at " << &a << endl;
+    }
+    ~B() { cout << "B destructed at " << this << endl; }
+};
+
+int main() {
+    cout << "construct via new" << endl;
+    new Empty;
+    cout << "construct in sizeof()" << endl;
+    cout << __LINE__ << ": " << sizeof(*(new Empty)) << endl;
+    A a;
+    A aa = a;
+    a = (const A&)aa;
+    B b(a);
+    B bb = b;
+    Uniq u;
+    u.setVal(15);
+    cout << __LINE__ << ": " << u.getVal() << endl;
+    // Uniq u1(u);
+    // Uniq u2;
+    // u2 = u;
+    Uniq* u2 = new Uniq;
+    cout << __LINE__ << ": " << u2->getVal() << endl;
+    u2->copy(u);
+    cout << __LINE__ << ": " << u2->getVal() << endl;
+}
\ No newline at end of file