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Type safety - Wikipedia, the free encyclopedia Type safety requires that well-typed programs have no unspecified behaviour (i.e., their semantics are complete). Type safety is usually a requirement for any toy language proposed in programming language research. Type safety is a property of the programming language, and not of the programs themselves. en.wikipedia.org /wiki/Type_safety   (833 words)

Datatype - Wikipedia, the free encyclopedia Duck typing is a humorous way of describing the (dynamic) typing typical of many scripting languages which guess the type of a value. Types usually have associations either with values in memory or with objects such as variables. If type A is compatible with type B, A is a subtype of B (but not always vice versa) - according to the Liskov substitution principle. en.wikipedia.org /wiki/Datatype   (2496 words)

Re: type safety Safety does have _something_ to do with types, in the following sense: If a programming language has unsafe programs, then it is always possible to define type systems which will exclude all of the unsafe programs. types: syntactic expressions which are associated with program fragments according to a set of typing rules and which (if the rules are sound) represent propositions satisfied by the program fragments. I disagree strongly with the thesis that: Type structure is a syntactic discipline for enforcing levels of abstraction. www.seas.upenn.edu /~sweirich/types/archive/1999-2003/msg00319.html   (987 words)

Type Safety (Ch. 2, Sec. 10) [Securing Java] Type safety means that a program cannot perform an operation on an object unless that operation is valid for that object. Type safety checks ensure that any object a method may try to manipulate is of the proper type. Type safety guarantees that programs will not do terrible and dangerous things such as treating pointers as integers (or vice versa) or falling off the end of an array. www.securingjava.com /chapter-two/chapter-two-10.html   (1128 words)

Type Safety Absolute type safety: Type errors are not possible in a well-formed program; the implementation guarantees that every operation on every object will succeed; else the program is not well-formed. Nominal type safety: Type errors are not possible in a well-formed program, unless explicit "dynamic" constructs (instance_of, dynamic_cast, class introspection) are used. Dynamic type safety: Type errors are possible in well-formed programs (and do not require use of explicit constructs which "waive" type-checking). www.bobcongdon.net /blog/2005/11/type-safety.html   (410 words)

Ball-type safety valve - Patent 4030520 Ball type safety valves are disclosed in the prior art for use in fluid flow lines to automatically close upon a rupture of the flow line downstream from the valve to prevent hazardous conditions from occuring and to prevent the waste of the fluid. This invention relates to improvements in the structure of ball type safety valves which are automatically responsive to an excess flow of fluid above a predetermined flow rate to close the valve. The safety valve according to claim 1 wherein said leak passages means comprises at least one restricted flow by-pass port through the transverse wall in which said at least one of said valve ports is located. www.freepatentsonline.com /4030520.html   (1858 words)

Re: type safety I believe that it is useless to distinguish "dynamic" and "static" type safety. So I do know that there is at least one person in the type community who understands that safety and types are independent concepts. In particular, some type systems help us prove that a program won't viololate certain safety restrictions that they implementation imposes on computational operations. www.seas.upenn.edu /~sweirich/types/archive/1999-2003/msg00271.html   (615 words)

Re: Dylan type-safety If the compiler indicates all points where either a type check or a possibly-failing dynamic dispatch occur, then code which has none of these points could legitimately be called "statically type correct". Possibly (and especially if the programmer makes good use of type annotation) the compiler may figure out that all possible values of b will be of type . My impression, as a relative newbie, is that it doesn't: Harry> even if you scrupulously declare the types of all your variables and Harry> methods, you can easily write code that causes run-time type errors with no Harry> warning from the compiler, and with no indication in the code that you're Harry> doing anything dangerous. www.ai.mit.edu /people/gregs/info-dylan-archive-html-1999/msg00091.html   (405 words)

Type safety in Nice Type checking guarantees that the array will not be written to by this method, so that there will be no run time failure. Partial solutions exist, notably using dependent types, but they are not ready for widespread use because of their high complexity. One of the limitations of Java is the absence of genericity: classes and methods cannot have type parameters. nice.sourceforge.net /safety.html   (2100 words)

Dylan type-safety Dylan's types seem superficially similar to Cecil's, but based on my experience I'd have to say that they don't provide the same kind of safety that Cecil's do. My impression, as a relative newbie, is that it doesn't: even if you scrupulously declare the types of all your variables and methods, you can easily write code that causes run-time type errors with no warning from the compiler, and with no indication in the code that you're doing anything dangerous. The purpose of Cecil's types is precisely to define these sorts of contracts and let the compiler ensure that they are fulfilled properly. www.ai.mit.edu /people/gregs/info-dylan-archive-html-1999/msg00090.html   (495 words)

Type-safety of Lava In the presence of multiform types and type parameters the semantics of the statement "object x conforms to type Y" has to be reconsidered. If the declared type T of a variable var is multiform and depends on virtual types then the actual run time meaning of T depends on the actual pattern context that has to be applied at run time at this place where var is referenced. A multiform type is a type whose declaration is contained in a pattern. lavape.sourceforge.net /doc/html/ProtectedFriend.htm   (4044 words)

Greg Steins ideas for type checking/safety The types associated with a name are almost incidental to the complete operation of a compiler type-inferencing system. This was not as pleasant as having the type information near the names, but we felt that was mainly due to the historical desire to assign types to names. More complex types are required, such as "this is a 3-tuple of an integer, a string, and a string". www.foretec.com /python/workshops/1998-11/greg-type-ideas.html   (1672 words)

Omron Machine Safeguarding Products - Safety Light Curtains, Safety Switches Type 2 safety light curtain operates independently or as part of safety systems. Safety door limit switch that mounts axially along the door hinge, cover or flap. Increases safety by detecting workers to warn of proximity to dangerous area. oeiweb.omron.com /Products-Safety.shtm   (473 words)

Type Safety and Security (.NET Framework Developer's Guide) Although verification of type safety is not mandatory to run managed code, type safety plays a crucial role in assembly isolation and security enforcement. (For this discussion, type safety specifically refers to memory type safety and should not be confused with type safety in a broader respect.) For example, type-safe code cannot read values from another object's private fields. Type Safety and Security (.NET Framework Developer's Guide) msdn.microsoft.com /library/en-us/cpguide/html/cpcontypesafetysecurity.asp?frame=true   (290 words)

LtU Classic Archives Type systems enforce mathematical purity and allow programming languages to converge on a canonical way of programming according to mathematical convention, the end of re-inventing "the wheel", a form of punishment used in the middle ages. The range of an integer type is, likewise, not defined by the language or definable in the language. In this case the problem is not that the checking is weak, it is that C's type system is weak. lambda-the-ultimate.org /classic/message4726.html   (1719 words)

CodeGuru: Generics in .NET: Type Safety, Performance, and Generality Generics were introduced to offer a combination of type safety, performance, and generality in the defined type, which is an all-around win. A generic is a type-safe class that is declared without a specific type applied to it in the definition. The specific type you want applied to the generic type is specified within the symbols. www.codeguru.com /Csharp/.NET/net_framework/microsoftnamespace/article.php/c9661   (1139 words)

Built-in Type Safety? Perhaps it would be more accurate to say that the C type system failed to help since this is one of those areas where C++ finds itself compromised and constrained by its C heritage. Programmers inform their compiler about the types they are using. C++ is a statically typed language but its type system is not bulletproof. www.artima.com /cppsource/typesafety.html   (794 words)

Chistory The language changes during this period, especially around 1977, were largely focused on considerations of portability and type safety, in an effort to cope with the problems we foresaw and observed in moving a considerable body of code to the new Interdata platform. The failure of the original language to include argument types in the type signature of a function was a significant weakness, indeed the one that required the X3J11 committee's boldest and most painful innovation to repair. Generalization was required: given an object of any type, it should be possible to describe a new object that gathers several into an array, yields it from a function, or is a pointer to it. cm.bell-labs.com /cm/cs/who/dmr/chist.html   (8388 words)

Development of a new type of safety fence for use in the construction industry Development of a new type of safety fence for use in the construction industry Literature review and consultation with CSST (Commission de la santé et de la sécurité du travail du Québec, Québec Occupational Health and Safety Commission) inspectors and industry representatives provided information which was used to optimize the prototype, most notably by adapting it for use on concrete flooring. The new safety fence is non-degradable and provides protection continuously throughout its length. www.irsst.qc.ca /en/_projet_2829.html   (368 words)

The Truth about Type Safety in Programming Languages The lack of type safety in C and C++ is probably useful for low-level programming, bit-twiddling. The third definition, that of a manifest as a list of goods, could be applied to compile-time type systems because the declarations of variables and their types could be interpreted as a manifest, but the information about values and their types at run-time is a manifest for the run-time system. The first two definitions could equally be applied to type systems such as Lisp's because the types of values are easily recognized and evident to the run-time system whereas types declared at compile-time are implicit at run-time. lisp-p.org /tat/tat.html   (1051 words)

A Recombinant Glycoprotein Vaccine for Herpes Simplex Type 2: Safety and Efficacy -- Langenberg et al. 122 (12): 889 -- Annals of Internal Medicine A Recombinant Glycoprotein Vaccine for Herpes Simplex Type 2: Safety and Efficacy Incidence of herpes genitalis in Northern Ireland in 1973-83 and herpes simplex types 1 and 2 isolated in 1982-4. Induction and enhancement of immune responses to herpes simplex virus type 2 in humans by use of a recombinant glycoprotein D vaccine. www.annals.org /cgi/content/full/122/12/889   (6530 words)

Java Arrays Break Type Safety The real pain of Java only completely enforcing type safety for arrays at run-time is that there is a run-time cost to array accesses, even though no sane code will ever fail the test. This breaks type safety, and therefore array accesses have to be type checked at runtime. If DataflowAnalysis shows that only elements of appropriate types are assigned to an array of fully known type, then the runtime checks can be neglected without harm. c2.com /cgi/wiki?JavaArraysBreakTypeSafety   (1818 words)

Enforce strict type safety with generics In this article, Conan Dalton attempts to present one of the bright sides of generics: the ability to enforce stricter type safety—in particular, a kind of type safety that can not be achieved with autocasting. , the event type is unconstrained, but at the cost of type safety. ; in other words, it lacks type information. www.javaworld.com /javaworld/jw-09-2004/jw-0920-generics.html   (869 words)

Typed Assembly Language These typing rules guarantee the memory safety, control flow safety, and type safety of TAL programs. Moreover, the typing constructs are expressive enough to encode most source language programming features including records and structures, arrays, higher-order and polymorphic functions, exceptions, abstract data types, subtyping, and modules. Typed Assembly Language (TAL) extends traditional untyped assembly languages with typing annotations, memory management primitives, and a sound set of typing rules. www.cs.cornell.edu /talc   (145 words)

Smalltalk.org™   articles   article_20050914_a1_Exploring_Type_Safety.html Right there the claimed benefit of "type safety" interfeers directly with the ability of a programmer to write and test their code in a dynamicly live and interactive system. Most often the type constrains are simplistic statements that limit the type of a variable to a specific type (or class or one of it's subclasses). Those that think that types are not used in Smalltalk are not entirely correct, "types" are used, or more correctly the objects class meta information is available for use at runtime to perform any necessary and all possible 'type' operations at run-time (which includes almost all the compile time "type" possibilities). smalltalk.org /articles/article_20050914_a1_Exploring_Type_Safety.html   (1992 words)

[Coq-Club] Type safety A proof_tree proves a goal if the goal has a type, and for each node in the tree the (goal, rule, subgoals) is a valid inference. Furthermore, 1) there are a small number of rules defined by the kernel, and 2) in each case, if the goal has a type then the subgoals have a type. type proof_tree = { open_subgoals : int; goal : goal; ref : (rule * proof_tree list) option } In a complete proof, there must be no open_subgoals, and no ref=None. pauillac.inria.fr /pipermail/coq-club/2005/001665.html   (233 words)

Java is not type-safe However, the signature of this class (its fields and methods, and their associated types) may be completely arbitrary, and designed to suit the requirements for spoofing. An implication of this example is that type information, rather than just typename information, must be taken into account at the time that the method table for a class is built. A more accurate term would be "link-time" type system, since many type checks are delayed till link-time (and almost no type-checks are performed at run-time; here by run-time I mean the second or subsequent invocation of an instruction). www.cis.upenn.edu /~bcpierce/courses/629/papers/Saraswat-javabug.html   (6176 words)

2005 Jaguar X-Type Safety & Crash Test Ratings - MSN Autos These organizations provide data for specific types of tests, which are valuable to consumers and worth observing. The crashworthiness data for this vehicle has been obtained from the Insurance Institute for Highway Safety and is protected by copyrights and other proprietary rights. Forces on the lower left leg were just high enough to indicate the possibility of injury. autos.msn.com /research/vip/safety.aspx?year=2005&make=Jaguar&model=X-Type   (319 words)

Sam Ruby: Type Safety in a Loosely Coupled World In the type safety/loose coupling sense, this design decision moves the assumption of type further into run-time. Chris Sells: I have always turned up my nose at run-time type checking until I realized (and this is the insight I got from Tim's talk) that *all* marshaling-based type checking is done at run-time. It tries really hard to guess a variable's type because it's difficult for the programmer to specify them either in the code or in HTML inputs and want to make this as easy as possible. www.intertwingly.net /blog/923.html   (1397 words)

Type Safety in the JVM: Some Problems in Java 2 SDK 1.2 and Proposed Solutions (ResearchIndex) These bugs, which lead to type safety violations, relate to the naming of reference types. Type Safety in the JVM: Some Problems in Java 2 SDK 1.2 and Proposed Solutions Type Safety in the JVM: Some Problems in Java 2 SDK 1.2 and Proposed Solutions (ResearchIndex) citeseer.ist.psu.edu /483868.html   (424 words)

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