Ruby Buffer.clear用法及代码示例

用 value 填充缓冲区，从 offset 开始，然后是 length 字节。

buffer = IO::Buffer.for('test')
# =>
#   <IO::Buffer 0x00007fca40087c38+4 SLICE>
#   0x00000000  74 65 73 74         test

buffer.clear
# =>
#   <IO::Buffer 0x00007fca40087c38+4 SLICE>
#   0x00000000  00 00 00 00         ....

buf.clear(1) # fill with 1
# =>
#   <IO::Buffer 0x00007fca40087c38+4 SLICE>
#   0x00000000  01 01 01 01         ....

buffer.clear(2, 1, 2) # fill with 2, starting from offset 1, for 2 bytes
# =>
#   <IO::Buffer 0x00007fca40087c38+4 SLICE>
#   0x00000000  01 02 02 01         ....

buffer.clear(2, 1) # fill with 2, starting from offset 1
# =>
#   <IO::Buffer 0x00007fca40087c38+4 SLICE>
#   0x00000000  01 02 02 02         ....