Resolving operators with user defined operands

Details Resolving operators with user defined operands Resolving operators with user defined operands

2003-10-31

2009-11-17

Vo, Ted T (Department: 2191)

Data processing: software development, installation, and managem

Software program development tool

Translation of code

C717S117000

Reexamination Certificate

active

07620944

ABSTRACT:
Techniques are disclosed to support the resolution of an operator which has been called with inconsistent typing and at least one operand of a user-defined type. In order to allow the compilation of such an operation, first all possible widening conversions for each operand are examined to determine if any widening conversions of any operands would result in types over which the operator is defined. If not, both the narrowing and the widening conversions of each operand are considered, to determine if any conversions of either or both operands would result in types for which the operator is defined. If only widening conversions are used, the most encompassed possible result type is selected as the target type. If a narrowing conversion is used, the most encompassing possible result type is selected as the target type. In order to use the target type, each operand is converted to the target type. The operation is then performed using the converted operands.

REFERENCES:
Microsoft, “C# Language Specification”, May 2001, Microsoft Corporation, Version 0.28, pp. i-xiii, 1-362.
Baker, T.P., “A One-Pass Algorithm for Overload Resolution in Ada”,ACM Transactions on Programming Languages and Systems(TOPLAS), 1982, 4(4), 601-614.
Neubauer, M. et al., “Functional Logic Overloading”,Annual Symposium on Principles of Programming Languages, Proceedings of the 29thACM SIGPLAN-SIGACT Symposium on Principles of Programming, 2002, 233-244.

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