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Add modern C++ language feature support to syntax highlighting #5792

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@shavesha shavesha commented Apr 8, 2025

This commit updates the C++ syntax highlight rules to support:

  • C++20 features: concepts, consteval, constinit, coroutines (co_await, co_yield, co_return)
  • Modules support (import, module)
  • Extended preprocessor directives (__has_include, __has_embed, etc.)
  • Additional control flow directives (elifdef, elifndef)
  • Newer type support (char8_t)
  • Contract programming keywords (pre, post, contract_assert)

These changes ensure proper syntax highlighting for modern C++ codebases using recent language standards.

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Description of changes:

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

Pull Request Checklist:

This commit updates the C++ syntax highlight rules to support:
- C++20 features: concepts, consteval, constinit, coroutines (co_await, co_yield, co_return)
- Modules support (import, module)
- Extended preprocessor directives (__has_include, __has_embed, etc.)
- Additional control flow directives (elifdef, elifndef)
- Newer type support (char8_t)
- Contract programming keywords (pre, post, contract_assert)

These changes ensure proper syntax highlighting for modern C++ codebases using recent language standards.
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