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As in classic C++, constructors are not inherited. Each derived class must define appropriate constructors. The base class constructor may be called from the derived class constructor for reference classes in the usual way by using the initializer list, as in Listing 8-13. Listing 8-13. Calling a Base Class Constructor // constructor_inheritance.cpp using namespace System; ref class MyBase { int data; public: MyBase() { Console::WriteLine("MyBase::MyBase()"); } MyBase(int data_in) : data(data_in) { Console::WriteLine("MyBase::MyBase(int)"); } }; ref class Derived : MyBase { public: // Invoke the base class constructor. Derived(int data) : MyBase(data) { Console::WriteLine("Derived::Derived(int)"); } }; int main() { // Derived d; // illegal: ctor w/o args not inherited MyBase b; Derived d(100); } The output of Listing 8-13 is shown here: MyBase::MyBase() MyBase::MyBase(int) Derived::Derived(int) Even though the code looks very similar to what you would do with native classes in classic C++, there is an important difference. The order in which initializer code is called is not the same as in classic C++. Listing 8-14 demonstrates this. In this example, there is a classic C++ inheritance hierarchy in a native type, and the same hierarchy with a reference type. In both cases, a field is initialized by the derived class constructor. The code is parallel in every way, and yet the behavior is different.

Address: 66.212.129.45 Assuming you want to know the domain name server of the computer in your network with the IP address 192.168.1.7, you will use nslookup 192.168.1.7 The output will resemble Listing 11-11. Listing 11-11. Doing nslookup on a Computer in Your Network Server: Address: 127.0.0.1 127.0.0.1#53 name = ns1.pvctoyfan.com.

Listing 8-14. Order of Initialization // constructor_order.cpp using namespace System; class NativeClass { public: NativeClass() { Console::WriteLine("NativeClass: Field constructor."); } }; ref class ManagedClass { public: ManagedClass() { Console::WriteLine("ManagedClass: Field constructor."); } }; class NativeBase { public: NativeBase() { Console::WriteLine("NativeBase: Base class constructor."); } }; class NativeDerived : NativeBase { NativeClass field; public: NativeDerived() : field() { Console::WriteLine("Native: Derived class constructor."); } };

Figure 3-8. Configuring the server 2. Make sure that the database name is listed properly for the SQL Server installation that you completed earlier. 3. Use the Browse button to find the administrative account that you wish to use. Click Configure when complete. 4. BizTalk will kindly inform you of what it is about to update and notify you of any inconsistencies by adding an exclamation point to anything that may have configuration issues. Clicking Next will move you on your way. When all is said and done, the server will be installed, configured, and ready for action!

Take the following steps to configure a caching DNS server: 1. Create a hints file called db.cache using dig and place it inside the /var/named/chroot/var/named directory: dig @a.root-servers.net . ns > /var/named/chroot/var/named/db.cache

This section has provided a whirlwind overview of what LVM can offer, but many more advanced features and other hints and tips are available. The best place for more information on LVM is the documentation at the Linux Documentation Project (http://tldp.org/HOWTO/LVM-HOWTO/), which contains in-depth descriptions of all the LVM features and a complete command reference and a detailed step-by-step guide.

ref class ManagedBase { public: ManagedBase() { Console::WriteLine("ManagedBase: Base class constructor."); } }; ref class ManagedDerived : ManagedBase { ManagedClass field; public: ManagedDerived() : field() { Console::WriteLine("ManagedDerived: Derived class constructor."); } }; int main() { NativeDerived nd; ManagedDerived md; } The different behavior is revealed when the code in Listing 8-14 is executed. The constructors are called in a different order in the two cases: NativeBase: Base class constructor. NativeClass: Field constructor. Native: Derived class constructor. ManagedClass: Field constructor. ManagedBase: Base class constructor. ManagedDerived: Derived class constructor. In the native type hierarchy, the base class constructor is called before the field initializer is called. In the reference type hierarchy, the initializer for the field is called first, before the base class constructor. As long as your initializers have no dependency on the base class s fields, you don t have to worry about this difference. If your initializers do depend on base class fields, the initialization code should be moved from the initializer list into the body of the constructor.

Note If you want to mount the disk permanently, simply follow the same instructions we used earlier, only this time, use the device name (/dev/vg-home/home/ in our example) instead of /dev/hdb1.

In classic C++, virtual functions behave differently in the constructor than they do elsewhere. This is because it was seen as undesirable to call virtual functions on derived classes whose

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