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Merge pull request #141 from brandonpollack23/static_const
Added notes, runtime constant eval, and footnoes to static-and-const.md
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@ -24,6 +24,8 @@ fn main() {
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}
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```
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According the the [Rust RFC Book][1] these are inlined upon use.
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## `static`
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You can also declare static variables:
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@ -36,4 +38,15 @@ fn main() {
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}
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```
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As noted in the [Rust RFC Book][1], these are not inlined upon use and have an actual associated memory location. This is useful for unsafe and embedded code, and have a `'static` lifetime.
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We will look at mutating static data in the [chapter on Unsafe Rust](../unsafe.md).
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<details>
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* Mention that `const` behaves semantically similar to C++'s `constexpr`.
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* `static`, on the other hand, is much more similar to a `const` or mutable global variable in C++.
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* It isn't super common that one would need a runtime evaluated constant, but it is helpful and safer than using a static.
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</details>
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