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Added some extra debug_asserts to ring_buf.

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This commit is contained in:
Colin Sherratt 2014-11-10 21:16:29 -05:00
parent ba24e33021
commit 4cae9add8c
1 changed files with 16 additions and 4 deletions
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20
src/libcollections/ring_buf.rs
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@ -209,7 +209,7 @@ impl<T> RingBuf<T> {
assert!(i < self.len());
assert!(j < self.len());
let ri = wrap_index(self.tail + i, self.cap);
let rj = wrap_index(self.tail + j, self.cap);
let rj = wrap_index(self.tail + j, self.cap);;
unsafe {
ptr::swap(self.ptr.offset(ri as int), self.ptr.offset(rj as int))
}
@ -320,6 +320,7 @@ impl<T> RingBuf<T> {
);
}
self.head += oldcap;
debug_assert!(self.head > self.tail);
} else { // C
unsafe {
ptr::copy_nonoverlapping_memory(
@ -329,7 +330,10 @@ impl<T> RingBuf<T> {
);
}
self.tail = count - (oldcap - self.tail);
debug_assert!(self.head < self.tail);
}
debug_assert!(self.head < self.cap);
debug_assert!(self.tail < self.cap);
}
}
@ -564,7 +568,10 @@ impl<T> RingBuf<T> {
/// ```
#[unstable = "matches collection reform specification, waiting for dust to settle"]
pub fn push_front(&mut self, t: T) {
if self.is_full() { self.reserve(1) }
if self.is_full() {
self.reserve(1);
debug_assert!(!self.is_full());
}
self.tail = wrap_index(self.tail - 1, self.cap);
let tail = self.tail;
@ -591,7 +598,10 @@ impl<T> RingBuf<T> {
/// ```
#[unstable = "matches collection reform specification, waiting for dust to settle"]
pub fn push_back(&mut self, t: T) {
if self.is_full() { self.reserve(1) }
if self.is_full() {
self.reserve(1);
debug_assert!(!self.is_full());
}
let head = self.head;
self.head = wrap_index(self.head + 1, self.cap);
@ -634,7 +644,9 @@ impl<T> RingBuf<T> {
#[inline]
fn wrap_index(index: uint, size: uint) -> uint {
// size is always a power of 2
index & (size - 1)
let idx = index & (size - 1);
debug_assert!(idx < size);
idx
}
/// Calculate the number of elements left to be read in the buffer