type system

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type system

The rules that apply to the data types in a programming language. Every language supports some number of data types (binary, text string, floating point, etc.) that are processed by the instructions. Type checking verifies that the operations performed on the data are correct; for example, a text string cannot be multiplied. Static type checking looks at the source code, while dynamic type checking works at runtime. Both methods are used to verify the proper operation of the program with regard to how instructions operate on the data. See data type and polymorphic typing.
References in periodicals archive ?
An alternative has been proposed for incorporating dynamic typing into a statically typed language, based on an explicit type dynamic for dynamically typed values [Abadi et al.
One motivation has been to allow any program to be expressed in a statically typed language which is expressible in a dynamically typed language (such as Lisp or Scheme); if a program in the latter language cannot be statically type-checked in certain places, then insert run-time checks into the code.
Dynamic typing in a statically typed language. ACM Transactions on Programming Languages and Systems 13, 2, 237-268.
Statically typed languages are now widely accepted as being a necessity for secure program execution, verifying at compile-time that programs satisfy certain decidable invariants in terms of the correct use of data structures, and yielding information about data usage which allows data representations to be optimized [Appel 1992].
In this article we present a new approach to incorporating dynamic typing into statically typed languages, particularly languages with parametric polymorphism such as ML.
Hence soft typing should be applicable to the individual datatypes of a statically typed language. It should be feasible to adapt our method of inferring type information to determine type information for variants in languages such as Standard ML.
In ordinary statically typed languages, pattern matching is largely a notational convenience and could be provided as a syntactic abbreviation (macro).
Statically typed languages provide all the benefits of types and type checking that we seek, but at the price of rejecting programs that do not satisfy the type system's arbitrary constraints.
(5) The same process cannot be used with statically typed languages such as ML because the Hindley-Milner type discipline does not provide implicit union types.
While these constructs were designed for ANSI C, it should be straightforward to add analogous constructs to other statically typed languages.
1993] are examples of statically typed languages. Self [Holzle 1990] is an example of a prototype-based language.
Unlike statically typed languages where the resolution of overloading takes place at compile time, in Lisp it occurs at run time.