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Overriding fields or properties in subclasses
I have an abstract base class and I want to declare a field or a property that will have a different value in each class that inherits from this parent class.
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Creating a BLOB from a Base64 string in JavaScript
I have Base64-encoded binary data in a string:
12 Answers
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Calling a base class's classmethod in Python
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super(Derived, cls).do(a)
This is how you would invoke the code in the base class's version of the method (i.e. print cls, a), from the derived class, with cls being set to the derived class.
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How to serialize an object into a string
...t. I would like to serialize the object into a string and store into a database instead. Can anyone help me?
13 Answers
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Copy constructor for a class with unique_ptr
...ove strategy works for simple types like int. If you have a unique_ptr<Base> that stores a Derived, the above will slice.
– Yakk - Adam Nevraumont
Apr 16 '13 at 18:35
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How to use concerns in Rails 4
...ecially named module ClassMethods, and that this module is extended by the base class be ActiveSupport::Concern, too.
– febeling
Sep 17 '13 at 7:10
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Hash function that produces short hashes?
...duce a sub-10-character hash? I want to produce reasonably unique ID's but based on message contents, rather than randomly.
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Should __init__() call the parent class's __init__()?
... a case of whether the you/the subclass needs "something", but whether the base class needs something in order to be a valid base class instance and work correctly. As implementer of the derived class, base class internals are things that you cannot/should not know, and even if you do because you wr...
Base64: What is the worst possible increase in space usage?
If a server received a base64 string and wanted to check it's length before converting,, say it wanted to always permit the final byte array to be 16KB. How big could a 16KB byte array possibly become when converted to a Base64 string (assuming one byte per character)?
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Python unit test with base and sub class
...lass CommonTests(object):
def testCommon(self):
print 'Calling BaseTest:testCommon'
value = 5
self.assertEquals(value, 5)
class SubTest1(unittest.TestCase, CommonTests):
def testSub1(self):
print 'Calling SubTest1:testSub1'
sub = 3
self.asser...