/**
* @note des first will be reset to ref.
*/
static void move(buffer& des, buffer& src)
{
des.reset();
if (src.is_ref())
{
des.data_ = src.data_;
des.size_ = src.size_;
}
else if (src.is_small())
{
des.capacity_ = RESP_SMALL_BUFFER_SIZE;
des.data_ = des.small_;
des.size_ = src.size_;
std::memcpy(des.data_, src.data_, des.size_);
}
else
{
/// large
des.capacity_ = src.capacity_;
des.data_ = src.data_;
des.size_ = src.size_;
}
/// clear src
src.capacity_ = 0;
src.data_ = 0;
src.size_ = 0;
}
/// Copy constructor.
buffer(buffer const& other)
: capacity_(other.capacity_)
, data_(0)
, size_(other.size_)
{
if (other.is_ref())
{
data_ = other.data_;
}
else if (other.is_small())
{
data_ = small_;
}
else
{
/// large
data_ = (char*)std::malloc(capacity_);
if (data_ == 0)
{
throw std::bad_alloc();
}
}
if (!is_ref())
{
std::memcpy(data_, other.data_, size_);
}
}