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The Marriage of Effects and Monads
, 1998
"... this paper is to marry effects to monads, writing T for a computation that yields a value in and may have effects delimited by oe. Now we have that ( is ..."
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this paper is to marry effects to monads, writing T for a computation that yields a value in and may have effects delimited by oe. Now we have that ( is
Compiling Standard ML to Java bytecodes
 IN THIRD ACM SIGPLAN INTERNATIONAL CONFERENCE ON FUNCTIONAL PROGRAMMING
, 1998
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Tackling the awkward squad: monadic input/output, concurrency, exceptions, and foreignlanguage calls in Haskell
 Engineering theories of software construction
, 2001
"... Functional programming may be beautiful, but to write real applications we must grapple with awkward realworld issues: input/output, robustness, concurrency, and interfacing to programs written in other languages. These lecture notes give an overview of the techniques that have been developed by th ..."
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Functional programming may be beautiful, but to write real applications we must grapple with awkward realworld issues: input/output, robustness, concurrency, and interfacing to programs written in other languages. These lecture notes give an overview of the techniques that have been developed by the Haskell community to address these problems. I introduce various proposed extensions to Haskell along the way, and I offer an operational semantics that explains what these extensions mean. This tutorial was given at the Marktoberdorf Summer School 2000. It will appears in the book “Engineering theories of software construction, Marktoberdorf Summer School 2000”, ed CAR Hoare, M Broy, and R Steinbrueggen, NATO ASI Series, IOS Press, 2001, pp4796. This version has a few errors corrected compared with the published version. Change summary: Apr 2005: some examples added to Section 5.2.2, to clarifyevaluate. March 2002: substantial revision 1
Monads and Effects
 IN INTERNATIONAL SUMMER SCHOOL ON APPLIED SEMANTICS APPSEM’2000
, 2000
"... A tension in language design has been between simple semantics on the one hand, and rich possibilities for sideeffects, exception handling and so on on the other. The introduction of monads has made a large step towards reconciling these alternatives. First proposed by Moggi as a way of structu ..."
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Cited by 75 (6 self)
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A tension in language design has been between simple semantics on the one hand, and rich possibilities for sideeffects, exception handling and so on on the other. The introduction of monads has made a large step towards reconciling these alternatives. First proposed by Moggi as a way of structuring semantic descriptions, they were adopted by Wadler to structure Haskell programs, and now offer a general technique for delimiting the scope of effects, thus reconciling referential transparency and imperative operations within one programming language. Monads have been used to solve longstanding problems such as adding pointers and assignment, interlanguage working, and exception handling to Haskell, without compromising its purely functional semantics. The course will introduce monads, effects and related notions, and exemplify their applications in programming (Haskell) and in compilation (MLj). The course will present typed metalanguages for monads and related categorica...
Monads, effects and transformations
 Electronic Notes in Theoretical Computer Science
, 1999
"... Abstract We define a typed compiler intermediate language, MILlite, which incorporates computational types refined with effect information. We characterise MILlite observational congruence by using Howe's method to prove a ciu theorem for the language in terms of a termination predicate defin ..."
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Abstract We define a typed compiler intermediate language, MILlite, which incorporates computational types refined with effect information. We characterise MILlite observational congruence by using Howe's method to prove a ciu theorem for the language in terms of a termination predicate defined directly on the term. We then define a logical predicate which captures an observable version of the intended meaning of each of our effect annotations. Having proved the fundamental theorem for this predicate, we use it with the ciu theorem to validate a number of effectbased transformations performed by the MLj compiler for Standard ML.
Taming Effects with Monadic Typing
, 1999
"... The familiar HindleyMilner type system of the ML language family is extended with monad annotations to account for possible side effects of expression evaluation. This also allows effects to be effectively encapsulated by lexical scopes, with enforcement provided by type checking. A typeandeffect ..."
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The familiar HindleyMilner type system of the ML language family is extended with monad annotations to account for possible side effects of expression evaluation. This also allows effects to be effectively encapsulated by lexical scopes, with enforcement provided by type checking. A typeandeffects analysis supports type inference. Type soundness and completeness theorems establish the coherence of monadic type inference with the reference semantics of a small MLstyle language. 1 Introduction Modern functional languages such as Haskell, Standard ML, CAML and Clean have evolved into wide spectrum programming languages through the addition of imperative features and foreignlanguage interfaces to a purely functional core. This evolution has been necessary to make these languages practical vehicles for the design and implementation of software systems but it has impaired our ability to reason about and formally manipulate programs. When evaluation of an expression may produce a side ...
2013): The Sequential Semantics of Producer Effect Systems
 In: POPL
"... Effects are fundamental to programming languages. Even the lambda calculus has effects, and consequently the two famous evaluation strategies produce different semantics. As such, much research has been done to improve our understanding of effects. Since Moggi introduced monads for his computational ..."
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Cited by 7 (0 self)
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Effects are fundamental to programming languages. Even the lambda calculus has effects, and consequently the two famous evaluation strategies produce different semantics. As such, much research has been done to improve our understanding of effects. Since Moggi introduced monads for his computational lambda calculus, further generalizations have been designed to formalize increasingly complex computational effects, such as indexed monads followed by layered monads followed by parameterized monads. This succession prompted us to determine the most general formalization possible. In searching for this formalization we came across many surprises, such as the insufficiencies of arrows, as well as many unexpected insights, such as the importance of considering an effect as a small component of a whole system rather than just an isolated feature. In this paper we present our semantic formalization for producer effect systems, which we call a productor, and prove its maximal generality by focusing on only sequential composition of effectful computations, consequently guaranteeing that the existing monadic techniques are specializations of productors.
Convenient explicit effects using type inference with subeffects
, 2010
"... Most programming languages in use today let one freely use arbitrary (side) effects. This is despite the fact that unknown and unrestricted side effects are the cause of many software problems. We propose a programming model where effects are treated in a disciplined way, and where the potential sid ..."
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Cited by 2 (1 self)
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Most programming languages in use today let one freely use arbitrary (side) effects. This is despite the fact that unknown and unrestricted side effects are the cause of many software problems. We propose a programming model where effects are treated in a disciplined way, and where the potential sideeffects of a function are apparent in its type signature. In contrast to most effect systems that are meant for internal compiler optimizations, our system is designed to be used by the programmer. Inspired by Haskell, we use a coarsegrained hierarchy of effects, like pure and io, which makes it convenient to read and write type signatures. The type and effect of expressions can also be inferred automatically, and we describe a polymorphic type inference system based on HindleyMilner style inference.
Monads and eects
 Lecture Notes in Computer Science
, 2002
"... Abstract. A tension in language design has been between simple semantics on the one hand, and rich possibilities for sideeects, exception handling and so on on the other. The introduction of monads has made a large step towards reconciling these alternatives. First proposed by Moggi as a way of st ..."
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Abstract. A tension in language design has been between simple semantics on the one hand, and rich possibilities for sideeects, exception handling and so on on the other. The introduction of monads has made a large step towards reconciling these alternatives. First proposed by Moggi as a way of structuring semantic descriptions, they were adopted by Wadler to structure Haskell programs, and now oer a general technique for delimiting the scope of eects, thus reconciling referential transparency and imperative operations within one programming language. Monads have been used to solve longstanding problems such as adding pointers and assignment, interlanguage working, and exception handling to Haskell, without compromising its purely functional semantics. The course will introduce monads, eects and related notions, and exemplify their applications in programming (Haskell) and in compilation (MLj). The course will present typed metalanguages for monads and related categorical notions, and describe how they can be further rened by introducing eects.
Reading, Writing and Relations Towards Extensional Semantics for Effect Analyses
"... Abstract. We give an elementary semantics to an effect system, tracking read and write effects by using relations over a standard extensional semantics for the original language. The semantics establishes the soundness of both the analysis and its use in effectbased program transformations. 1 ..."
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Abstract. We give an elementary semantics to an effect system, tracking read and write effects by using relations over a standard extensional semantics for the original language. The semantics establishes the soundness of both the analysis and its use in effectbased program transformations. 1