instance method

IO::Buffer#empty?

() -> bool

empty? → true or false

static VALUE
rb_io_buffer_empty_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->size == 0);
}

If the buffer has 0 size: it is created by ::new with size 0, or with ::for from an empty string. (Note that empty files can’t be mapped, so the buffer created with ::map will never be empty.)

See also #each_byte #external? #each #free also in 4.1 · 3.4 · 3.3 · 3.2 · 3.1

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