OnceLock

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Jun 1, 2025 Rust lazy_static LazyLock OnceLock

Runtime-initialized variables in Rust

Rust offers different ways to initialize compile time-initialized variables. Recently, I had to create a runtime-initialized variable: existing approaches don’t work in this case. I want to describe multiple ways to achieve it in this post. Constants The Rust language allows you to create constants. Two keywords are available: const and static. Sometimes a certain value is used many times throughout a program, and it can become inconvenient to copy it over and over. What’s more, it’

Nicolas Fränkel
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