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This explicitly documents behavior of C++ Nix that goes against the intuition you'd gather from this document: that e.g. a simple select from an attribute set causes a value to no longer be pointer equal to its former self. The point of documenting this is that we can show in a to be written section on the use of pointer equality in nixpkgs that pointer equality is only needed in a limited sense for evaluating it (C++ Nix's exterior pointer equality). Tvix's pointer equality is far more powerful since value identity preserving operations also preserve pointer equality, generally speaking (this is because we implement interior pointer equality in my made up terminology). This should eventually also be documented. Change-Id: I6ce7ef2d67b012f5ebc92f9e81bba33fb9dce7d0 Reviewed-on: https://cl.tvl.fyi/c/depot/+/8856 Tested-by: BuildkiteCI Autosubmit: sterni <sternenseemann@systemli.org> Reviewed-by: tazjin <tazjin@tvl.su> |
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| .. | ||
| .gitignore | ||
| component-flow.puml | ||
| components.md | ||
| default.nix | ||
| lang-version.md | ||
| language-spec.md | ||
| Makefile | ||
| value-pointer-equality.md | ||