November 2019
Beginner to intermediate
408 pages
9h 29m
Korean
Content preview from 밑바닥부터 시작하는 비트코인
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6
장
스크립트
165
6.3.1
연산자의 구현
이제
OP
_
DUP
연산을 다음과 같이 코딩할 수 있습니다.
OP
_
DUP
은 간단히 스택 위의 동일한 원소
를 올립니다.
def op_dup(stack):
if len(stack) < 1:
➊
return False
stack.append(stack[-1])
➋
return True
...
OP_CODE_FUNCTIONS = {
...
118: op_dup,
➌
...
}
➊ 적어도 하나의 원소가 스택 위에 있어야만 복사할 수 있습니다. 그렇지 않으면
OP
_
DUP
연
산어를 실행할 수 없습니다.
➋ 스택 위의 원소를 복사하여 붙이는 방법입니다.
➌
118
(=
0x76
)은
OP
_
DUP
의 오피코드입니다.
OP
_
DUP
동작이 오류 없이 성공하면
True
불리언을 반환합니다. 실패하면 자동적으로 스크립
트가 유효하지 않게 됩니다.
다음은
OP
_
HASH256
연산에 대한 파이썬 코딩입니다. 이 연산자는 스택 위 원소를 가져와서 이
의
hash256
해시값을 구해서 새로운 원소로 스택 위에 올립니다.
def op_hash256(stack):
if len(stack) < 1:
return False
element = stack.pop()
stack.append(hash256(element))
return True
...
OP_CODE_FUNCTIONS ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.