Daniel Hauser haudan
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| use std::collections::BTreeMap; | |
| fn first_free_key<V>(map: &BTreeMap<usize, V>) -> usize { | |
| map.keys() | |
| .zip(map.keys().skip(1)) | |
| .find(|(a, b)| (*b - *a) > 1) | |
| .map(|(a, _)| *a + 1) | |
| .unwrap_or_else(|| map.keys().last().map(|x| x + 1).unwrap_or(0)) | |
| } |
haudan
/ container_of.c
Last active
September 6, 2021 13:54
CONTAINER_OF macro to downcast types more easily in C
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| //===--------------------~ Source ~--------------------===// | |
| #include <stdint.h> | |
| #ifndef offsetof | |
| #define offsetof(type, member) ((uintptr_t)&((type*)0)->member) | |
| #endif | |
| #define CONTAINER_OF_CONST(member_ptr, container_ty, member_name) \ | |
| ((container_ty const*) ((uintptr_t) member_ptr - offsetof(container_ty, member_name))) |
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