#Metaprogramming via scripting

• Brilliant sample from 'Metaprogramming in .Net' book
• Scripting: Roslyn CTP vs. IronPython
• ScriptCS eval()-like
• Roslyn CTP: scripting and results as dynamic
• IronPython: scripting, DLR and results as dynamic
  • C# code
  • .py code

#Dynamically generating .Net assembly at runtime

• Roslyn CTP: build and load assembly in memory
• CodeDOM
  • build and load assembly in memory
  • C# 4.0 and 5.0 features, not supported by Roslyn CTP yet

#Metaprogramming via runtime code generation

• Hardcoded C# rule: ~900ms to run 1000 iterations
• Roslyn CTP: scripting and statically typed results: ~950ms to run 1000 iterations
• DLR i.e. Dynamic Language Runtime with ExpressionTrees: ~1200ms to run 1000 iterations

#Code-as-Data approach

• Roslyn CTP convert VB → C#, and back
• Roslyn CTP and T4
  • Runtime template transformation using T4
  • Generate types, models and algorithms from JSON input using Roslyn CTP

#Introspection

• Roslyn CTP: Calculate code complexity
  • asynchronously
  • using Rx
• Roslyn CTP: search for return null;.
  • asynchronously
  • using Rx
  • using Syntax Walker
  • Full sample with yeild return null;, default(T) and value/reference types check is here
• Using System.Reflection to limit dependencies of assemblies
  • Test dependencies of assemblies intersection

#Nemerle: compile-time macro

• Nemerle macro: compile- with run- time execution
  • compile-time macro
  • compile-time macro usage
  • introduce new syntax keyword fault
  • new syntax keyword fault usage