Preview Ruby 4.1 is a preview. It can change before the final release. Switch to Ruby 4.0 →
instance method
IO::Buffer::Storage#internal?
internal? → true or false
io_buffer.c
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static VALUE
rb_io_buffer_internal_p(VALUE self)
{
struct rb_io_buffer_view *buffer = get_io_buffer_view(self);
return RBOOL(buffer->flags & RB_IO_BUFFER_INTERNAL);
}
If the buffer is internal, meaning it references memory allocated by the buffer itself.
An internal buffer is not associated with any external memory (e.g. string) or file mapping.
Internal buffers are created using ::new and is the default when the requested size is less than the IO::Buffer::PAGE_SIZE and it was not requested to be mapped on creation.
Internal buffers can be resized. Slices remain valid if their ranges still fit within the resized buffer, including when its storage is relocated.