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PackedBuffer.h
template <typename T, bool (*remove_predicate)(const T&)>
class PackedBuffer
{
public:
PackedBuffer(size_t size)
: size_(0)
, buffer_(size)
{}
size_t size() const { return size_; }
void clear() { size_ = 0; }
T& add()
{
T& o = buffer_[size_];
size_++;
if (size_ > buffer_.size())
size_ = buffer_.size();
return o;
}
void add(const T& v)
{
T& o = add();
o = v;
}
void pack()
{
for (int i = 0; i < size_; i++)
{
const T& o = buffer_[i];
if (!remove_predicate(o))
{
remove_element(i);
i--;
}
}
}
T& operator[](size_t index) { return buffer_[index]; }
const T& operator[](size_t index) const { return buffer_[index]; }
private:
size_t size_;
std::vector<T> buffer_;
void remove_element(size_t index)
{
std::swap(buffer_[index], buffer_[size_ - 1]);
size_--;
}
};
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