rename in_range to check_range.

Signed-off-by: Jack <jack.wgm@gmail.com>
add fetch_data function, no implement.

Signed-off-by: Jack <jack.wgm@gmail.com>
修正注解.

Signed-off-by: Jack <jack.wgm@gmail.com>
修正代码命名.

Signed-off-by: Jack <jack.wgm@gmail.com>
完善说明

Signed-off-by: Jack <jack.wgm@gmail.com>
添加get_range实现.

Signed-off-by: Jack <jack.wgm@gmail.com>
添加inverse实现.

Signed-off-by: Jack <jack.wgm@gmail.com>