Why Rust allows many readers but only One Writer

Short summary

This article explains Rust's core ownership principle — Aliasing XOR Mutation — using accessible analogies and concrete examples like bank transaction data races and iterator invalidation in C. It contrasts C's permissive memory model with Rust's compile-time enforcement that allows either many read-only references or one mutable reference, but never both simultaneously. The piece traces the history of memory safety bugs and how Graydon Hoare designed Rust to eliminate them before runtime.

• •Rust enforces Aliasing XOR Mutation: many readers OR one writer, never both at once
• •Concrete examples show data races in C bank transactions and iterator invalidation from pointer aliasing
• •Graydon Hoare designed Rust to eliminate entire classes of memory safety bugs at compile time

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