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util/CircularBuffer: add noexcept and constexpr

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This commit is contained in:
Max Kellermann 2024-07-29 22:07:10 +02:00
parent 9fe6493fc2
commit 0899d80ae0
1 changed files with 12 additions and 12 deletions
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24
src/util/CircularBuffer.hxx
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@ -41,39 +41,39 @@ protected:
const pointer data; const pointer data;
public: public:
constexpr CircularBuffer(pointer _data, size_type _capacity) constexpr CircularBuffer(pointer _data, size_type _capacity) noexcept
:capacity(_capacity), data(_data) {} :capacity(_capacity), data(_data) {}
CircularBuffer(const CircularBuffer &other) = delete; CircularBuffer(const CircularBuffer &other) = delete;
protected: protected:
constexpr size_type Next(size_type i) const { constexpr size_type Next(size_type i) const noexcept {
return i + 1 == capacity return i + 1 == capacity
? 0 ? 0
: i + 1; : i + 1;
} }
public: public:
void Clear() { constexpr void Clear() noexcept {
head = tail = 0; head = tail = 0;
} }
constexpr size_type GetCapacity() const { constexpr size_type GetCapacity() const noexcept {
return capacity; return capacity;
} }
constexpr bool empty() const { constexpr bool empty() const noexcept {
return head == tail; return head == tail;
} }
constexpr bool IsFull() const { constexpr bool IsFull() const noexcept {
return Next(tail) == head; return Next(tail) == head;
} }
/** /**
* Returns the number of elements stored in this buffer. * Returns the number of elements stored in this buffer.
*/ */
constexpr size_type GetSize() const { constexpr size_type GetSize() const noexcept {
return head <= tail return head <= tail
? tail - head ? tail - head
: capacity - head + tail; : capacity - head + tail;
@ -83,7 +83,7 @@ public:
* Returns the number of elements that can be added to this * Returns the number of elements that can be added to this
* buffer. * buffer.
*/ */
constexpr size_type GetSpace() const { constexpr size_type GetSpace() const noexcept {
/* space = capacity - size - 1 */ /* space = capacity - size - 1 */
return (head <= tail return (head <= tail
? capacity - tail + head ? capacity - tail + head
@ -95,7 +95,7 @@ public:
* Prepares writing. Returns a buffer range which may be written. * Prepares writing. Returns a buffer range which may be written.
* When you are finished, call Append(). * When you are finished, call Append().
*/ */
Range Write() { constexpr Range Write() noexcept {
assert(head < capacity); assert(head < capacity);
assert(tail < capacity); assert(tail < capacity);
@ -113,7 +113,7 @@ public:
* Expands the tail of the buffer, after data has been written * Expands the tail of the buffer, after data has been written
* to the buffer returned by Write(). * to the buffer returned by Write().
*/ */
void Append(size_type n) { constexpr void Append(size_type n) noexcept {
assert(head < capacity); assert(head < capacity);
assert(tail < capacity); assert(tail < capacity);
assert(n < capacity); assert(n < capacity);
@ -132,7 +132,7 @@ public:
* Return a buffer range which may be read. The buffer pointer is * Return a buffer range which may be read. The buffer pointer is
* writable, to allow modifications while parsing. * writable, to allow modifications while parsing.
*/ */
Range Read() { constexpr Range Read() noexcept {
assert(head < capacity); assert(head < capacity);
assert(tail < capacity); assert(tail < capacity);
@ -142,7 +142,7 @@ public:
/** /**
* Marks a chunk as consumed. * Marks a chunk as consumed.
*/ */
void Consume(size_type n) { constexpr void Consume(size_type n) noexcept {
assert(head < capacity); assert(head < capacity);
assert(tail < capacity); assert(tail < capacity);
assert(n < capacity); assert(n < capacity);