thereadme/theread.me
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

rust-boxed-str: fix hello length 5

Browse Source
This commit is contained in:
Mahdi Dibaiee 2022-10-15 18:25:26 +01:00
parent 5d87619783
commit 8987d46eb9
1 changed files with 4 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
_posts/2022-06-16-rust-boxed-str-vs-string.md
View File

@ -238,10 +238,10 @@ char` is represented using `u8` in Rust, so in Rust terminology the type is
0x000000016fdfed78: (unsigned char *) pointer = 0x0000600000004010 0x000000016fdfed78: (unsigned char *) pointer = 0x0000600000004010
0x000000016fdfed78: (core::marker::PhantomData<unsigned char>) _marker = {} 0x000000016fdfed78: (core::marker::PhantomData<unsigned char>) _marker = {}
} }
0x000000016fdfed80: (unsigned long) cap = 6 0x000000016fdfed80: (unsigned long) cap = 5
0x000000016fdfed78: (alloc::alloc::Global) alloc = {} 0x000000016fdfed78: (alloc::alloc::Global) alloc = {}
} }
0x000000016fdfed88: (unsigned long) len = 6 0x000000016fdfed88: (unsigned long) len = 5
} }
} }
``` ```
@ -249,8 +249,8 @@ char` is represented using `u8` in Rust, so in Rust terminology the type is
Ah! I see the `ptr` field of `RawVec` with a value of `0x0000600000004010`, that Ah! I see the `ptr` field of `RawVec` with a value of `0x0000600000004010`, that
is the memory address of the beginning of our string (namely the `h` of our is the memory address of the beginning of our string (namely the `h` of our
`hello`)! There is also `cap` and `len`, which respectively stand for capacity `hello`)! There is also `cap` and `len`, which respectively stand for capacity
and length, with the value 6, indicating that our string is of capacity and and length, with the value 5, indicating that our string is of capacity and
length 6; the difference between the two being that [you can have a `Vec` with a length 5; the difference between the two being that [you can have a `Vec` with a
capacity of 10 while it has zero capacity of 10 while it has zero
items](https://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#capacity-and-reallocation), items](https://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#capacity-and-reallocation),
this would allow you to append 10 items to the `Vec` without having a new this would allow you to append 10 items to the `Vec` without having a new