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Once that first line of code has been written and tested, what follows next is a refactoring. You ll want to inspect your code and see that it contains no shortcuts, and that it will work and be robust. Of course, having written the tests, it s trivial to see if your refactoring works. If the tests fail, then the refactoring must be fixed. Overall, though, test-driven development that includes refactoring follows these steps: 1. Implement a piece of functionality by writing some code. 2. Write test scripts to test the functionality. 3. Run the test scripts. 4. Refactor the written code. 5. Rerun, verify, and fix the refactored code. 6. Go back to the first step. Even though you ll try to apply patterns in step 1, it s difficult, because it s hard to see how a system will behave ahead of time. Of course, you ll have general directions and general ideas. Compare this to growing a garden. Sure, you know the dimensions of the garden, and you know what you want to grow. What you don t know is whether you ll get any fruits and vegetables. You might get a snail or bug invasion. Weeds might grow rampantly, and there might be too much sun or too much rain. To make a garden successful, you need to adapt it. The same applies to code. This doesn t mean to implement code without thinking about design patterns ahead of time, rather you still need to think about things and plan hence why it s important to be flexible.

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Prepackaged libraries may or may not support the pure option. For example, as of Visual C++ 2008, ATL and MFC don t support /clr:pure. It depends on whether or not they were compiled with the /clr:pure option. You may recompile your own native libraries as pure code, provided they meet certain restrictions, such as not using Inline assembly. __declspec(align). Any construct that brings in native code. Code that generates native exports (i.e., not using __dllexport to expose functions compiled in a pure assembly to native callers). This is because the calling convention used in pure assemblies (__clrcall) is incompatible with native code. #import to use a COM library. Intrinsics, unless the intrinsics have an MSIL implementation, such as certain C runtime or CRT functions. Refer to the appendix for a table of what s available in which compilation mode. If you re a library vendor, you might decide to ship a native and a pure version of the same library. This is what Microsoft does for the CRT and Standard C++ Libraries. Updates to the C Runtime Library and the Standard C++ Library allow programs to use the pure version of these libraries. If you compile with /clr or /clr:pure, the appropriate pure version of these standard libraries will be linked in. Using a separate pure version of a library can be advantageous if there are frequent calls to a library, since it s better if program execution remains mainly in either managed code or native code, rather than switching frequently between the two.

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When writing the first line of source code, it s important to understand what the context of the first line of code is. There are four unique contexts, defined as follows: Cleanup: You re not adding any code, but modifying existing code. Extension: You re adding new code, but not modifying existing code. Maintenance: You re modifying existing code, but only insofar as to fix certain problems. New: You re creating entirely new code. The new code might be part of an already existing code base. The following sections explain these different contexts, and the text thereafter explains various refactorings that can be used in the different contexts. It s important when writing code that one of these contexts be applied. With each context, certain boundaries are defined.

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