symmetry

Are merges in Git symmetric?

由 生来就可爱ヽ(ⅴ＜●) 提交于 2019-11-30 06:28:59
问题 Lets say we have two branches ( B and C ) that have diverged from a common ancestor A . Will merging from B to C produce the same result as merging from C to B ? A | / \ B C To clarify- I'm assuming that any manual merge conflict resolutions will occur in both directions. But will any automatic merges that occur result in the same code being chosen? This is what I'm assuming, since the commit dates are identical in both directions. To further clarify - I know that the actual merging results

Making a Read instance in Haskell

由 依然范特西╮ 提交于 2019-11-30 06:27:21
I have a data type data Time = Time {hour :: Int, minute :: Int } for which i have defined the instance of Show as being instance Show Time where show (Time hour minute) = (if hour > 10 then (show hour) else ("0" ++ show hour)) ++ ":" ++ (if minute > 10 then (show minute) else ("0" ++ show minute)) which prints out times in a format of 07:09 . Now, there should be symmetry between Show and Read , so after reading (but not truly (i think) understanding) this and this , and reading the documentation , i have come up with the following code: instance Read Time where readsPrec _ input = let

Graphviz Dot, mix directed and undirected

由 |▌冷眼眸甩不掉的悲伤 提交于 2019-11-30 04:15:49
For my application I need to represent simultaneously (on the same graph) two relations: one is simmetric, the other is not. Targets: Ideally the two relation should result in edges having different colors; For the symmetric relation I would like not to have double-edges; Is there a way of doing this with dot ? digraph { A; B; C subgraph Rel1 { edge [dir=none, color=red] A -> B -> C -> A } subgraph Rel2 { edge [color=blue] B -> C C -> A } } 来源： https://stackoverflow.com/questions/13236975/graphviz-dot-mix-directed-and-undirected

Python commutative operator override

由 南笙酒味 提交于 2019-11-30 02:47:22
问题 Hi I was wondering if there is a way to do a symmetric operator override in Python. For example, let's say I have a class: class A: def __init__(self, value): self.value = value def __add__(self, other): if isinstance(other, self.__class__): return self.value + other.value else: return self.value + other Then I can do: a = A(1) a + 1 But if I try: 1 + a I get an error. Is there a way to override the operator add so that 1 + a will work? 回答1: Just implement an __radd__ method in your class.

Making a Read instance in Haskell

由 谁说我不能喝 提交于 2019-11-29 06:07:06
问题 I have a data type data Time = Time {hour :: Int, minute :: Int } for which i have defined the instance of Show as being instance Show Time where show (Time hour minute) = (if hour > 10 then (show hour) else ("0" ++ show hour)) ++ ":" ++ (if minute > 10 then (show minute) else ("0" ++ show minute)) which prints out times in a format of 07:09 . Now, there should be symmetry between Show and Read , so after reading (but not truly (i think) understanding) this and this, and reading the

Are merges in Git symmetric?

由 久未见 提交于 2019-11-28 19:09:10
Lets say we have two branches ( B and C ) that have diverged from a common ancestor A . Will merging from B to C produce the same result as merging from C to B ? A | / \ B C To clarify- I'm assuming that any manual merge conflict resolutions will occur in both directions. But will any automatic merges that occur result in the same code being chosen? This is what I'm assuming, since the commit dates are identical in both directions. To further clarify - I know that the actual merging results in "mirror images" of each other based on the direction. I'm just asking about the automatically
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