Method for selective back-tracking in a hierarchical system cont

Details Method for selective back-tracking in a hierarchical system cont Method for selective back-tracking in a hierarchical system cont

1989-09-13

1992-08-04

Lee, Thomas C.

Boots, shoes, and leggings

364DIG1, 3642811, 364275, 395 1, G06F 1200

Patent

active

051366983

ABSTRACT:
A method of back-tracking in a computer processing operation in which the programmer can be provided with a number of different types of the back-track controlling, from which a suitable one can freely be selected in accordance with the need of the programmer. In this method, a flag is provided in each choice point, for indicating a type of back-track controlling, and a stack which contains an address of a choice point specified as a present choice point by a present choice point register and an address of a preceding choice point which is immediately preceding the present choice point is utilized in changing indication of the flag.

REFERENCES:
patent: 4931931 (1990-06-01), Syre et al.
patent: 5016164 (1991-05-01), Srivastava
Warren, "An Abstract Prolog Instruction Set," SRI International, Technical Note 309, Oct. 1983, pp. 1-30.

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