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Emulation Programming C++17
Added in 1.90.0

Boost.OpenMethod

Open-methods are virtual functions that exist outside of classes, as free-standing functions. They make it possible to add polymorphic behavior to existing classes, without modifying them. This implementation supports single and multiple dispatch.

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Dependencies

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Documentation

Boost.OpenMethod

This page gives a 10,000-foot view of the library. For the motivation, tutorials and reference, please follow the documentation link.

Features

  • Free-standing virtual functions, similar to CLOS, Clojure, Julia, Dylan, etc.

  • Single dispatch can be as fast as equivalent virtual function calls.

  • Multiple dispatch in constant time (for a given number of virtual parameters).

  • Redundancy-free multiple dispatch tables.

  • Inter-operation with standard smart pointers, extensible to other pointer-like types.

  • Exception agnostic by default.

  • Macro-based interface for convenience.

  • Macro-free interface for inter-operation with templates.

  • Customization points for alternative RTTI systems, error handling, vptr placement, etc.

  • Header-only.

Requirements

The library requires an optimizing compiler supporting C++17 or above.

Tested Compilers

Boost.OpenMethod is tested with the following compilers:

  • clang: 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20

  • gcc: 8, 9, 10, 11, 12, 13, 14, 15

  • msvc: 14.3

  • icpx

…​on the following platforms:

  • Linux

  • macOS

  • Windows

  • s390x

Quality Assurance

The development infrastructure for the library includes these per-commit analyses:

  • Coverage reports

  • Clang sanitizers

  • Compilation and tests on Drone.io and GitHub Actions

Build Status

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master

CI

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develop

CI

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Deps

Documentation

Community

Questions, suggestions, defect reports, etc can be submitted via the following channels:

  • Slack. Best for quick questions, especially for those getting started with the library.

  • The Boost developers mailing list. Best for in-depth discussion of the features, future, and implementation of the library. Be sure to read the discussion policy before posting. Please add the [openmethod] tag at the beginning of the subject line.

  • Issues page on GitHub. Best for bug reports. Please mention the Boost version, platform and compiler you are using, and provide a small compilable code sample to reproduce the problem. Also a good place for feature requests and suggestions.

License

Distributed under the Boost Software License, Version 1.0.

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