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You may be wondering if, like the Hello type in the previous chapter, you could also have created Atom as a value type. If you only change ref to value and recompile, you get an error message that states value types cannot define special member functions this is because of the definition of the default constructor, which counts as a special member function. Thanks to the compiler, value types always act as if they have a built-in default constructor that initializes the data members to their default values (e.g., zero, false, etc.). In reality, there is no constructor emitted, but the fields are initialized to their default values by the CLR. This enables arrays of value types to be created very efficiently, but of course limits their usefulness to situations where a zero value is meaningful. Let s say you try to satisfy the compiler and remove the default constructor. Now, you ve created a problem. If you create an atom using the built-in default constructor, you ll have atoms with atomic number zero, which wouldn t be an atom at all. Arrays of value types don t call the constructor; instead, they make use of the runtime s initialization of the value type

This completes the steps for creating a custom functoid. You can now add the functoid to a BizTalk map and test it. When a map is ready for deployment, the functoid will need to be copied to the Mapper Extensions folder (see step 6) and the GAC on the production server. Figure 3 39 shows the new functoid with custom bitmap in the toolbox in Visual Studio.

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One of the biggest benefits to using custom functoids is that you have full access to the .NET libraries. Inline code within maps gives only limited access to libraries, and coding is often primitive. Custom functoids are created as .NET class libraries, and they have all of the related coding benefits. The example shown in this recipe is very simple. Custom functoids do not have to be limited to the two functions shown in the code. For example, assume that you need a functoid that does some sort of interaction with a database. You may need to include an Init() function and a deconstructor to terminate a connection, all of which can be included in the class library. Additionally, you may need multiple input parameters for your functoid. Additional parameters can be added very easily. See Listing 3 21 for an example of a functoid with three input parameters. Listing 2-22. Multiple Input Parameters for a Custom Functoid SEE CODE FROM Listing 3 20. // three parameters in, one parameter out this.SetMinParams(3); this.SetMaxParams(3); ... // add one of the following lines of code for every input

fields to zero, so if you wanted to create arrays of atoms, you would have to initialize them after constructing them. You could certainly add an Initialize function to the class to do that, but if some other programmer comes along later and tries to use the atoms before they re initialized, that programmer will get nonsense (see Listing 2-3). Listing 2-3. C++/CLI s Version of Heisenberg Uncertainty void atoms() { int n_atoms = 50; array<Atom>^ atoms = gcnew array<Atom>(n_atoms); // Between the array creation and initialization, // the atoms are in an invalid state. // Don't call GetAtomicNumber here! for (int i = 0; i < n_atoms; i++) { atoms[i].Initialize( /* ... */ ); } } Depending on how important this particular drawback is to you, you might decide that a value type just won t work. You have to look at the problem and determine whether the features available in a value type are sufficient to model the problem effectively. Listing 2-4 provides an example where a value type definitely makes sense: a Point class. Listing 2-4. Defining a Value Type for Points in 3D Space // value_struct.cpp value struct Point3D { double x; double y; double z; }; Using this structure instead of the array makes the Atom class look like Listing 2-5. Listing 2-5. Using a Value Type Instead of an Array ref class Atom { private: Point3D position; unsigned int atomicNumber; unsigned int isotopeNumber;

// parameter. All lines would be identical. AddInputConnectionType(ConnectionType.All); // input parameter 1 AddInputConnectionType(ConnectionType.All); // input parameter 2 AddInputConnectionType(ConnectionType.All); // input parameter 3 } // Actual function which does the replacement of symbols public string EncodeChars(String strInputValue, strReplace1, strReplace2) { strInputValue = strInputValue.Replace("&",strReplace1); strInputValue = strInputValue.Replace("<",strReplace2); return strInputValue; }

You are mapping a message in BizTalk Server and need to manipulate date and time fields. Specifically, you must use the current date in order to determine a required date and time in the future, which is added to the outbound message during mapping. Additionally, you must apply the processing time for each document during mapping.

// Force a collection of dh: finalizer only, not // the destructor. GC::Collect(); } Here is the output of Listing 8-17: ~Derived !Derived ~Base !Base Collecting after G() !Derived !Base The output of Listing 8-17 shows that the finalizer for the derived class is called first, followed by any base classes. If there is more than one base class, the finalizers are called in order from the most derived class up to the root base class.

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