instance method

IO::Buffer#null?

() -> bool

null? → true or false

static VALUE
rb_io_buffer_null_p(VALUE self)
{
    struct rb_io_buffer *buffer = NULL;
    TypedData_Get_Struct(self, struct rb_io_buffer, &rb_io_buffer_type, buffer);

    return RBOOL(buffer->base == NULL);
}

If the buffer was freed with free, transferred with transfer, or was never allocated in the first place.

Example

buffer = IO::Buffer.new(0)
buffer.null? #=> true

buffer = IO::Buffer.new(4)
buffer.null? #=> false
buffer.free
buffer.null? #=> true

See also #not! #or! #mapped? #pread also in 4.1 · 3.4 · 3.3 · 3.2 · 3.1

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