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Overview:

Type constraints express subtype-relationships between the types of program expressions that are required for type-correctness, and were originally proposed as a convenient framework for solving type checking and type inference problems. This paper shows how type constraints can be used as the basis for practical refactoring tools. In one's approach, a set of type constraints is derived from a type-correct program P. The main insight behind the work is the fact that P constitutes just one solution to this constraint system, and that alternative solutions may exist that correspond to refactored versions of P. The paper shows how a number of refactorings for manipulating types and class hierarchies can be expressed naturally using type constraints.

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Format:PDFSize:607 KB
Date:Jun 2007
Pages:17

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