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Advanced Programming Techniques in D

String Mixins

Explore the use of string mixins in the D programming language to insert compile-time generated code as strings. Understand how mixins can concatenate multiple arguments, generate complex code, and how to debug them using compiler options. This lesson helps you apply string mixins for more flexible and powerful programming.

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Another powerful feature of D the ability to insert code as string as long as that string is known at compile time. The syntax of string mixins requires the use of parentheses:

mixin (compile_time_generated_string)

For example, the hello world program can also be written with a mixin:

D
import std.stdio;



void main() {

    mixin (`writeln("Hello, World!");`);

}

The string gets inserted as code.

We can go further and insert all of the program as a string mixin:

D
import std.stdio;



mixin (

`import std.stdio; void main() { writeln("Hello, World!"); }`

);

Obviously, there is no need for mixins in these examples, as the strings could have been written as code.

The power of string mixins comes from the fact that the code can be generated at compile ...