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    <p>Here it goes:</p> <pre><code>#include &lt;vector&gt; #include &lt;cstdio&gt; /* A class that operates on an std::vector. */ class Vector { public: virtual std::vector&lt;int&gt; &amp; getVector() = 0; virtual void operation() = 0; virtual ~Vector() {} }; /* Basic implementation of Vector. */ class BasicVector : public Vector { public: BasicVector(std::vector&lt;int&gt; &amp; refVector) : intVector(refVector) {} void operation() { intVector.push_back(2); } std::vector&lt;int&gt; &amp; getVector() { return intVector; } private: std::vector&lt;int&gt; &amp; intVector; }; /* First decorator. */ class VectorDecorator1 : public Vector { public: VectorDecorator1(Vector &amp; refVec) : intVec(refVec) {} std::vector&lt;int&gt; &amp; getVector() { return intVec.getVector(); } void operation() { intVec.operation(); intVec.getVector().push_back(3); } private: Vector &amp; intVec; }; /* Second decorator. Others can be easily added in the future. */ class VectorDecorator2 : public Vector { public: VectorDecorator2(Vector &amp; refVec) : intVec(refVec) {} std::vector&lt;int&gt; &amp; getVector() { return intVec.getVector(); } void operation() { intVec.operation(); intVec.getVector().push_back(4); } private: Vector &amp; intVec; }; int main(int argc, char *argv[]) { std::vector&lt;int&gt; my_vector; my_vector.push_back(1); BasicVector basic_vector(my_vector); VectorDecorator1 vd1(basic_vector); VectorDecorator2 vd2(vd1); vd2.operation(); for(unsigned i = 0; i &lt; my_vector.size(); i++) { printf("%d\n", my_vector[i]); } return 0; } </code></pre> <p>Note: if you prefer, it's easy to change BasicVector to make it operate on its own std::vector (instead of a reference).</p>
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