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that the units are obvious. To a new programmer, they won t be. To someone who s been working on another part of the system, they won t be. After the program has been substantially modified, they won t be.

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What we re looking for should be easily maintainable. And it should be stored in the source control system like everything else that takes part in the CI process. The obvious way to automate the build process is to script it using human-readable text. You should avoid everything that doesn t use text as a description of a build process. Compile managers are bad, bad things. You should ban from your mind any automation tool that keeps the build description in binary format and requires you to manually click to make it run. Text form is easier to create, read, edit, and keep track of (using version control) than binary form. In chapter 1, you saw a simple example of automation using ordinary commandline commands organized in a batch file; software automation was done this way at the dawn of time. It makes the process faster in comparison to manually issuing commands, it reduces redundant tasks because you don t have to be involved in every build, and it lets others maintain the build. Now, let s walk through some real automation tools and search for the best one.

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Automatic Memory Management (Garbage Collection)

documenting allowable ranges of variables is to use assertions at the beginning and end of a routine to assert that the variable s values should be within a prescribed range. For more details, see Section 8.2, "Assertions."

objects L through O . And while running, the application stops using objects G, L, and M, making them all unreachable . The heap now looks like Figure 21-12 .

Comment the range of allowable numeric values If a variable has an expected range of values, document the expected range. One of the powerful features of the Ada programming language was the ability to restrict the allowable values of a numeric variable to a range of values. If your language doesn t support that capability (which most languages don t), use a comment to document the expected range of values. For example, if a variable represents an amount of money in dollars, indicate that you expect it to be between $1 and $100. If a variable indicates a voltage, indicate that it should be between 105v and 125v. Comment coded meanings If your language supports enumerated types as C++ and Visual Basic do use them to express coded meanings. If it doesn t, use comments to indicate what each value represents and use a named constant rather than a literal for each of the values. If a variable represents kinds of electrical current, comment the fact that 1 represents alternating current, 2 represents direct current, and 3 represents undefined.

Let s say that allocating object P causes generation 0 to exceed its budget, causing a garbage collection to occur . Because the memory occupied by all of the objects in generation 1 is less than 2 MB, the garbage collector again decides to collect only generation 0, ignoring the unreachable objects in generation 1 (objects B and G) . After the collection, the heap looks like Figure 21-13 .

Here s an example of documenting variable declarations that illustrates the three preceding recommendations:

FIguRE 21-13 After three collections, generation 0 survivors are promoted to generation 1 (growing the size

Software-automation platforms are older than most active software developers. The great-grandfather of almost all current tools is the UNIX make utility, which was created

In Figure 21-13, you see that generation 1 keeps growing slowly . In fact, let s say that generation 1 has now grown to the point in which all of the objects in it occupy 2 MB of memory . At this point, the application continues running (because a garbage collection just finished) and starts allocating objects P through S, which fill generation 0 up to its budget . The heap now looks like Figure 21-14 .

Dim cursorX As Integer Dim cursorY As Integer ' horizontal cursor position; ranges from 1..MaxCols ' vertical cursor position; ranges from 1..MaxRows ' length of antenna in meters; range is >= 2 ' strength of signal in kilowatts; range is >= 1 ' ASCII character code; ranges from 0..255 ' size of character in points; ranges from 4..127

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