codesnips

metaprogramming

rust 
macro_rules! create_function {
    ($func_name:ident) => {
        fn $func_name() {
            println!("Called {}", stringify!($func_name));
        }
    };

Declarative macros (macro_rules!) for code generation

rust macros metaprogramming
by Marcus Chen 1 tab
ruby 
# Define refinements in a module
module StringExtensions
  refine String do
    def titleize
      split.map(&:capitalize).join(' ')
    end

Ruby refinements for scoped monkey patching

ruby refinements monkey-patching
by Sarah Mitchell 2 tabs
ruby 
class DynamicFinder
  def initialize(records)
    @records = records
  end

  def method_missing(method_name, *args, &block)

Metaprogramming with method_missing and define_method

ruby metaprogramming method_missing
by Sarah Mitchell 3 tabs
rust 
// In a proc-macro crate:
use proc_macro::TokenStream;
use quote::quote;
use syn::{parse_macro_input, DeriveInput};

#[proc_macro_derive(MyTrait)]

Procedural macros for custom derives and attributes

rust macros metaprogramming
by Marcus Chen 1 tab