builder 0.1.0

A library permitting easy addition of a builder pattern to a class.

To use this package, run the following command in your project's root directory:

Manual usage
Put the following dependency into your project's dependences section:


This small project provides a boiler-plate free mechanism to add a Builder API to classes.

Advantages of a Builder API:

  • unambiguous: Parameter names rather than their order is used to set values.
  • fluent: An object can be initialized in a single expression, allowing them to be used inline as function arguments, etc.
  • consistent: When used throughout a project, class construction becomes uniform and consistent, improving code readability.
  • portable: Such patterns are common in other languages, such as Java, and using them can help people more easily transition into D projects.


Example initialization without a builder:

class A1 {
  private int a;
  private string b;
  private int c = 3;

  void setA(int a) {
    this.a = a;
  // More setters...

// One method to build a1, which is verbose.
A1 a1 = new A1();
// Another way to build a1, which can make large numbers of parameters ambiguous.
A1 a1 = new A1(3, "ham");

Using the AddBuilder template from within a class, creates an inner class and methods to support a Builder API. Using this pattern, it is now possible to create and initialize objects as a single expression, which allows them to be built, for example, as function arguments.

import builder : AddBuilder;

// Parameter initializers and inheritance are both supported.
class A2 : A1 {
  string d = "sam";

  mixin AddBuilder!(typeof(this));


The Builder API is heavily influenced by Project Lombok's Builder for Java.

  • Vijay Nayar
0.1.0 2023-Jan-05
~master 2023-Jan-05
Show all 2 versions
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