Bug 7696 – The Array container works improperly when using as a property

When an array container using as a property, the inner array (m_Children) must be set the capacity to a non-zero value. Otherwise, many operations (like reserve, insertBack, etc.) on the outter array (Children) works improperly. The sample code is below. ========================= public class TestClass { @property { public Array!(int) Children() { return m_Children; } public void Children(Array!(int) value) { m_Children = value;} } private Array!(int) m_Children; void populate() { m_Children.reserve(0); // the capacity can't be zero; //Children.reserve(10); // no effect writefln("%d", m_Children.capacity); writefln("%d", Children.capacity); //m_Children.clear(); for(int i=0; i< 5; i++) { Children.insertBack(i); // Here is the problem. It is affected by m_Children's capacity. //m_Children.insertBack(i); // ok } writefln("Children length %d", Children.length); } this() { } } int main(string[] args) { TestClass testInstance = new TestClass(); testInstance.populate(); return 0; }

It's because your property is returning a copy of the array not the original. Fixed by using a reference to the Array like so: public ref Array!(int) Children() { return m_Children; }