Last time: abstraction and parametricity ∃ ∀ 1/ 53 This time: GADTs a ≡ b 2/ 53 What we gain ⇓ Γ ⊢: Γ ⊢: ⇓ (Addtionally, some programs become faster!) 3/ 53 What we gain ⇓ Γ ⊢: Γ ⊢: ⇓ (Addtionally, some programs become faster!) 3/ 53 What it costs We’ll need to: […]
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A modular foreign function interface Jeremy Yallop, David Sheets and Anil Madhavapeddy Docker, Inc, and University of Cambridge Computer Laboratory Abstract Foreign function interfaces are typically organised monolithically, tying to- gether the specification of each foreign function with the mechanism used to make the function available in the host language. This leads to inflexible systems,
Last time: GADTs a ≡ b 1/ 47 This time: GADT programming patterns 2/ 47 Recap: depth-annotated trees T[2] max(1,0)≡1 T[1] max(0,0)≡0 E a E b E type (’a,_) dtree = EmptyD : (’a,z) dtree | TreeD : (’a,’m) dtree * ’a * (’a,’n) dtree * (’m,’n,’o) max → (’a,’o s) dtree 3/ 47 Functions
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Chapter 10 First-class effects 10.1 Effects in OCaml Most of the programs and functions we have considered so far are pure: they turn parameters into results, leaving the world around them unchanged. However, most useful programs and many useful functions are not pure: they may modify memory, write to or read from files, communicate over
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Last time: Overloading val (=) : {E:EQ} → E.t → E.t → bool 1/ 52 This time: monads (etc.) >>= 2/ 52 What do monads give us? A general approach to implementing custom effects A reusable interface to computation A way to structure effectful programs in a functional language 3/ 52 Effects 4/ 52 What’s
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Lambda calculus (Advanced Functional Programming) Jeremy Yallop Computer Laboratory University of Cambridge January 2017 1/ 64 Course outline 2/ 64 Books OCaml from the very beginning John Whitington Coherent Press (2013) Real World OCaml Yaron Minsky, Anil Madhavapeddy & Jason Hickey O’Reilly Media (2013) Types and Programming Languages Benjamin C. Pierce MIT Press (2002) 3/
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Chapter 6 Abstraction Type structure is a syntactic discipline for maintaining levels of abstraction – John Reynolds, “Types, Abstraction and Parametric Polymorphism” Abstraction, also known as information hiding, is fundamental to computer science. When faced with creating and maintaining a complex system, the interactions of different components can be simplified by hiding the details of
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Programming Language Pragmatics Programming Language Pragmatics FOURTH EDITION This page intentionally left blank Programming Language Pragmatics FOURTH EDITION Michael L. Scott Department of Computer Science University of Rochester AMSTERDAM • BOSTON • HEIDELBERG • LONDON NEW YORK • OXFORD • PARIS • SAN DIEGO SAN FRANCISCO • SINGAPORE • SYDNEY • TOKYO Morgan Kaufmann is
CS131: Programming Languages Zhaowei Tan Discussion 1B Week 10, Winter 2022 Copyright By PowCoder代写 加微信 powcoder Course Announcement • For homework 6 & Project, you MUST submit it by today! • Sample final review • Final Exam – Monday, March 14, 2022, 11:30 AM – 2:30 PM WG YOUNG CS50 – Similar rules as midterm
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Compilers and computer architecture: Semantic analysis Martin Berger Alex Jeffery October 2015 Recall the function of compilers Recall the structure of compilers Source program Lexical analysis Intermediate code generation Optimisation Syntax analysis Semantic analysis, e.g. type checking Code generation Translated program Semantic analysis One of the jobs of the compiler front-end is to reject ill-formed