Fix std::hash compilation error for gsl::not_null<std::shared_ptr<T>> #1210
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Copilot
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[WIP] Compilation error with std::hash<gsl::not_null<std::shared_ptr<T>>> in GSL 4.2.0
Fix std::hash compilation error for gsl::not_null<std::shared_ptr<T>>
Jun 2, 2025
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Pull Request Overview
This PR fixes the compilation error related to the specialization of std::hash for gsl::not_null<std::shared_ptr> by changing the template deduction from decltype(.get()) to use typename T::element_type.
- Update not_null_hash template in include/gsl/pointers to correctly deduce the type.
- Add new tests in tests/notnull_tests.cpp to verify correct behavior of std::hash with not_null.
- Ensure compatibility with both C++14 and C++20 standards.
Reviewed Changes
Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.
| File | Description |
|---|---|
| tests/notnull_tests.cpp | Added test cases to validate correct hashing behavior for not_null<std::shared_ptr>. |
| include/gsl/pointers | Updated the not_null_hash template to use typename T::element_type for proper type deduction. |
carsonRadtke
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Jul 26, 2025
carsonRadtke
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Dec 4, 2025
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|
@copilot Can you rebase these changes onto main so the tests actions re-run? |
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carsonRadtke
requested changes
Dec 4, 2025
Co-authored-by: carsonRadtke <10507970+carsonRadtke@users.noreply.github.com>
…null_hash Co-authored-by: carsonRadtke <10507970+carsonRadtke@users.noreply.github.com>
Co-authored-by: carsonRadtke <10507970+carsonRadtke@users.noreply.github.com>
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gdr-at-ms
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carsonRadtke
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All changes have been successfully rebased onto the latest main branch and unnecessary file has been removed.
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