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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

Creating user-defined literals


D doesn't have specialized syntax for user-defined literals, but using the template syntax with the right implementation, we can generate the same code as if it did. A distinguishing factor of user-defined literals is that there must be zero runtime cost to use them. Here, we'll write the code to enable integer literals written in octal, a simplified version of the implementation of octal in Phobos' std.conv module.

Getting ready

First, let's write an octal number parser, converting from string to integer. The algorithm is simple: read a digit, multiply our accumulator by eight, and then add the value to the accumulator until we're out of digits. Any invalid digit is an exception. All these steps are shown in the following code:

int readOctalString(string n) {
  int sum = 0;
  foreach(c; n) {
    if(c < '0' || c > '7')
      throw new Exception("Bad octal number " ~ n);
    sum *= 8;
    sum += c - '0';
  }

  return sum;
}

unittest {
  assert(readOctalString...
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Programming languages
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D Cookbook
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