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  • Book Overview & Buying D Cookbook
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D Cookbook

D Cookbook

By : Adam Ruppe
5 (9)
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D Cookbook

D Cookbook

5 (9)
By: Adam Ruppe

Overview of this book

A recipe-packed reference guide filled with practical tasks that are concisely explained to develop and broaden the user's abilities with the D programming language. If you are an experienced programmer who is looking to explore a language that offers plenty of advantages over more established programming languages, this is the book for you. We assume that you are already familiar with general programming language basics, but you do not need to be a proficient user of D.
Table of Contents (21 chapters)
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D Cookbook
Credits
Foreword
About the Author
About the Reviewers
www.PacktPub.com
Preface
2
Index

Determining whether a module is available


We might want to compile some extension features if and only if another module is available at compile-time to gracefully degrade when a dependency isn't installed. The most straightforward solution is to use the version statement, passing the appropriate identifier to the dmd command line. Can we also do it without extra compiler options from the user?

How to do it…

Let's execute the following steps to determine whether a module is available:

  1. Try to compile an anonymous function that does nothing other than import a module.

  2. Use it conditionally by wrapping any use of the module inside the static if statement.

  3. Instruct the user to enable the module by placing it at a location where the compiler can find it automatically, or by adding the following module to the compile command line.

The code is as follows:

static if(__traits(compiles, { import test.foo; })) {
    import test.foo; /* safe to use */
} else {
   // module not available, work around
}

How it...

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Programming languages
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D Cookbook
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