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Behind LINQ – and beyond

Mads Torgersen, Microsoft. Behind LINQ – and beyond. L anguage IN tegrated Q uery An open multi-language query facility Uses cool language stuff Points into the future. LINQ. Declarative More “what”, less “how” Higher order functions Type inference Comprehensions Metaprogramming

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Behind LINQ – and beyond

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  1. Mads Torgersen, Microsoft Behind LINQ – and beyond

  2. Language INtegratedQuery • An open multi-language query facility • Uses cool language stuff • Points into the future LINQ

  3. Declarative • More “what”, less “how” • Higher order functions • Type inference • Comprehensions • Metaprogramming • Expression trees What language stuff?

  4. DEMO

  5. Language neutral • Expressions now • Statements soon • Declarations and programs later? • Strongly tied to reflection now • Runtime independent later? Expression trees

  6. API for efficient dynamic lookup No special CLR (it’s the VM ) support Caching via ETs and runtime code generation Dynamic Language Runtime (DLR)

  7. Call sites cache a delegate which does the dispatch • Slow path is (caller) language specific. Typically • Ask the receiver object if it wants to lookup • If not, use language binding rules on runtime type • Either way, return rule and meaning ETs • Patch up dispatch ET with new case • Compile ET and install in call site HOW the DLR WORKS

  8. Dynamic languages and features • IronPython, IronRuby • Dynamic lookup in other languages? • Functional languages and features • F# • Mutability tracking? Pattern matching? • Parallelism • Plinq, Parallel Extensions and beyond • Metaprogramming • More compiler in APIs? • More API in compilers? The FUTURE?

  9. ?

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