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Update generic notes to match example (#2720)

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Fixes #2716.
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Dustin J. Mitchell 2025-04-23 05:05:18 -04:00 committed by GitHub
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src/generics/generic-functions.md
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@ -57,14 +57,14 @@ fn main() {
val: u8, val: u8,
} }
pick(123, Foo { val: 7 }, Foo { val: 456 }); pick(false, Foo { val: 7 }, Foo { val: 99 });
``` ```
- This is similar to C++ templates, but Rust partially compiles the generic - This is similar to C++ templates, but Rust partially compiles the generic
function immediately, so that function must be valid for all types matching function immediately, so that function must be valid for all types matching
the constraints. For example, try modifying `pick` to return `even + odd` if the constraints. For example, try modifying `pick` to return `left + right` if
`n == 0`. Even if only the `pick` instantiation with integers is used, Rust `cond` is false. Even if only the `pick` instantiation with integers is used,
still considers it invalid. C++ would let you do this. Rust still considers it invalid. C++ would let you do this.
- Generic code is turned into non-generic code based on the call sites. This is - Generic code is turned into non-generic code based on the call sites. This is
a zero-cost abstraction: you get exactly the same result as if you had a zero-cost abstraction: you get exactly the same result as if you had