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Simplify logic for circular_buffer<T>::set_capacity

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This commit is contained in:
Roland Bock 2023-10-01 15:10:15 +02:00
parent ea9bd9ee32
commit 4616450af1
1 changed files with 10 additions and 30 deletions
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40
include/sqlpp11/detail/circular_buffer.h
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@ -73,40 +73,20 @@ namespace sqlpp
} }
template <typename T> template <typename T>
void circular_buffer<T>::set_capacity(std::size_t capacity) void circular_buffer<T>::set_capacity(std::size_t new_capacity)
{ {
if (capacity == _capacity) if (new_capacity == _capacity)
{ {
return; return;
} }
if (_tail >= _head) // Reduce the number of cases by rotating `front()` to `_data.begin()`.
{ std::rotate(_data.begin(), _data.begin() + _tail, _data.end());
if (empty() == false)
{ _tail = 0;
std::rotate(_data.begin(), _data.begin() + _tail, _data.end()); _head = (new_capacity > _size) ? _size : 0;
} _data.resize(new_capacity);
_head = (capacity > _size) ? _size : 0; _capacity = new_capacity;
_tail = 0; _size = std::min(_size, new_capacity);
}
else
{
if (capacity < _head)
{
std::rotate(_data.begin(), _data.begin() + _tail, _data.begin() + _head);
_head = (capacity > _size) ? _size : 0;
_tail = 0;
}
else if (capacity == _head)
{
_head = 0;
}
}
_data.resize(capacity);
_capacity = capacity;
if (_size > capacity)
{
_size = capacity;
}
} }
template <typename T> template <typename T>