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Logtalk 2.43.3

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Object-oriented logic programming language. Free

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Paulo Moura

Logtalk is an object-oriented logic programming language that can use most Prolog implementations as a back-end compiler.

As a multi-paradigm language, Logtalk includes support for both prototypes and classes, protocols (interfaces), component-based programming through category-based composition, event-driven programming, and high-level multi-threading programming.

What's New

Version 2.43.3:

Changed the compiler to take into account the uses/2 directive when compiling calls to the reflection built-in methods. This change extends the semantics of the uses/2 directive and allows easier migration from plain Prolog applications to Logtalk.
Updated the implementation of the predicate_property/2 built-in method, adding a scope/1 property.
Updated the Logtalk compiler to add information about a source file name, source file directory, and source file compiler options to the generated Prolog files. In previous versions, this information was registered only when loading a source file. The changes simplify building applications where Logtalk libraries are pre-compiled and pre-loaded.
Updated the Logtalk compiler to print the name of the hook object used in the compilation of source files when the "hook" compiler flag is defined.
Updated the built-in debugger in order to avoid unnecessary choice points created by back-end Prolog compilers whose retract/1 implementation fails to take advantage of logical update semantics to make calls deterministic.
Corrected a bug in the Logtalk compiler runtime handler where it failed to decompile internal entity identifiers when throwing entity existence exceptions.
Updated the Lean Prolog config file, adding index/1 directives for some of the dynamic predicates used by the internal Logtalk runtime tables.
Updated the SWI-Prolog integration files to test for the availability of the index/1 directive, which is deprecated by the new experimental SWI-Prolog support for just-in-time multi-argument indexing.
Added predicates subsequence/4 (for generating subsequences of a list with a given length), substitute/4 (for replacing elements in a list), and hamming_distance/3 to the library "listp" and "list" entities.
Added euclidean_norm/2, chebyshev_norm/2, manhattan_norm/2, euclidean_distance/3, chebyshev_distance/3, manhattan_distance/3, and scalar_product/3 predicates to the library "numberlistp" and "numberlist" entities.
Corrected some silly bugs in the definition of the "character" library object predicates is_bin_digit/1, is_octal_digit/1, is_dec_digit/1, and is_hex_digit/1.
Updated the library "all_loader.lgt" loader file to also load the "meta_compiler_loader.lgt" loader file.

Version 2.43.3:

Changed the compiler to take into account the uses/2 directive when compiling calls to the reflection built-in methods. This change extends the semantics of the uses/2 directive and allows easier migration from plain Prolog applications to Logtalk.
Updated the implementation of the predicate_property/2 built-in method, adding a scope/1 property.
Updated the more...

Requirements