Ruby Weak References - Latest Information & Updates 2026

Web Reference: Weakref Weak Reference class that allows a referenced object to be garbage-collected. A WeakRef may be used exactly like the object it references. The current way of marking weak references uses rb_gc_mark_weak(VALUE *ptr). This presents challenges because Ruby's GC is incremental, meaning that if the ptr changes (e.g. realloc'd or free'd), then we could have an invalid memory access. Sep 14, 2021 · WeakRef uses an ObjectSpace::WeakMap internally to store the weak references. Although this class is intended for internal use (and thus may change in behavior between versions), I still found it more straight-forward to use it directly rather than via a WeakRef.

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Last Updated: April 5, 2026

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