2024-05-06 20:40:05 +00:00
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---
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2024-10-30 17:04:36 +00:00
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date: 20201120
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2024-05-06 20:40:05 +00:00
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id: e3a6f28a-27fd-489d-b2b4-de6d2c149a60
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title: as~ptrrange~
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---
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# Description
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as~ptrrange~[^1] returns the two raw pointers spanning the slice.
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The returned range is half-open, which means that the end pointer points
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one *past* the last element of the slice. This way, an empty slice is
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represented by two equal pointers, and the difference between the two
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pointers represents the size of the slice.
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This function is useful for interacting with foreign interfaces which
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use two pointers to refer to a range of elements in memory, as is common
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in C++.
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# Declaration
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``` rust
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pub fn as_ptr_range(&self) -> Range<*const T>
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```
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# Traits for Range\<A\>
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``` rust
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impl<A> Iterator for Range<A> where
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A: Step, type Item = A;
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```
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# Syntax
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``` rust
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#![allow(unused)]
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fn main() {
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let a = [1, 2, 3];
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let x = &a[1] as *const _;
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let y = &5 as *const _;
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assert!(a.as_ptr_range().contains(&x));
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assert!(!a.as_ptr_range().contains(&y));
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}
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```
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# Footnotes
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[^1]: <https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr_range>
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