Add std::hash specializations for Date, Time, DateTime#278
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Add std::hash specializations for Date, Time, DateTime#278
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Allow Date, Time, and DateTime to be used as keys in std::unordered_map and std::unordered_set by providing std::hash specializations in each type's header. Date hashes via julian(), Time via hhmmss() (avoiding floating-point hash pitfalls on the underlying double), and DateTime combines both using a new hash_combine utility. Requires ecbuild fix for sg.pl to handle template <> syntax. Fixes: ECKIT-561 Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Description
Allow Date, Time, and DateTime to be used as keys in std::unordered_map and std::unordered_set by providing std::hash specializations in each type's header.
Date hashes via julian(), Time via hhmmss() (avoiding floating-point hash pitfalls on the underlying double), and DateTime combines both using a new hash_combine utility.
Requires ecbuild fix for sg.pl to handle template <> syntax.
Fixes: ECKIT-561
NOTE: blocked by a bug in ecbuild/sg.pl ecmwf/ecbuild#134
Contributor Declaration
By opening this pull request, I affirm the following:
🌦️ >> Documentation << 🌦️
https://sites.ecmwf.int/docs/dev-section/eckit/pull-requests/PR-278