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Is if(items != null) superfluous before foreach(T item in items)?
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It is not superflous. At runtime items will be casted to an IEnumerable and its GetEnumerator method will be called. That will cause a dereferencing of items that will fail
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When should a class be Comparable and/or Comparator?
...he compile-time error) ; your implementation has to cope with objects, and cast as needed but in a robust way.
Comparable<Itself> is very strict on the contrary.
Funny, when you subclass Itself to Subclass, Subclass must also be Comparable and be robust about it (or it would break Liskov ...
Matplotlib tight_layout() doesn't take into account figure suptitle
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Casting fig.tight_layout(rect=[0, 0.03, 1, 0.95]) also works.
– soupault
Sep 16 '15 at 13:06
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Why is 'this' a pointer and not a reference?
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@Omnifarious you could write &reinterpret_cast<char&>(this); to get the real address for overloading operator& (in fact, this is sort of what boost::addressof does).
– Johannes Schaub - litb
Jul 1 '10 at 22:57
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Converting JSONarray to ArrayList
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I think it's not possible to cast ArrayList<Object> to ArrayList<String>
– Vasilii Suricov
Feb 2 '17 at 19:03
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Which exception should I raise on bad/illegal argument combinations in Python?
...string knowing that non-empty strings are always True. It might save him a cast.
If the arguments have invalid values, raise ValueError. This seems more appropriate in your case:
if recurse and not save:
raise ValueError("If recurse is True, save should be True too")
Or in this specific case...
How do you get the logical xor of two variables in Python?
...!= bool(b) != bool(c) to be the same as bool(a) ^ bool(b) ^ bool(c). So do casts to bool, but I would recommend ^. To know what's going up in the first example look up "operator chaining".
– elmo
Jul 25 '12 at 11:50
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Is it possible in Java to catch two exceptions in the same catch block? [duplicate]
... @Sephallia U r right. It seems backwards, but u could use casting inside the catch statement.
– emory
Jun 26 '12 at 22:18
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How to compare objects by multiple fields
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Especially the cast (Person p) is important for chained comparators.
– membersound
Oct 6 '17 at 7:42
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How to find if a given key exists in a C++ std::map
... @jv110 The Microsoft C++ compiler issues a warning when it encounters a cast from int to bool. Though there are other C++ compilers that do not issue a similar warning, I prefer using an explicit comparison to make the intent clear and enhance readability. Note that other languages such as C# for...