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Use of 'const' for function parameters
...o allows the compiler to make certain performance decisions.
*: Unless it casts away the const-ness, but that's another post.
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Troubleshooting “Illegal mix of collations” error in mysql
... option is to use the BINARY operator:
BINARY str is the shorthand for CAST(str AS BINARY).
Your solution might look something like this:
SELECT * FROM table WHERE BINARY a = BINARY b;
or,
SELECT * FROM table ORDER BY BINARY a;
...
Abstract class in Java
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If we wish to access a member specific to a particular subclass, we must cast down to that subclass first:
// Say ImplementingClass also contains uniqueMethod()
// To access it, we use a cast to tell the runtime which type the object is
AbstractClass b = new ImplementingClass();
((ImplementingCla...
Is null reference possible?
...ingleton object that represents NULL within the class as follows and add a cast-to-pointer operator that returns nullptr ?
Edit: Corrected several mistypes and added if-statement in main() to test for the cast-to-pointer operator actually working (which I forgot to.. my bad) - March 10 2015 -
// E...
How can I get a count of the total number of digits in a number?
...ointed out in the comment section, the LOG10 method had to be fixed with a casting to double inside Math.Abs() for the case when the input value is int.MinValue or long.MinValue.
Regarding the early performance tests I've implemented before editing this question (it had to be edited a million times...
What's the rationale for null terminated strings?
... to output, or
you would have to make it have a very strange behavior when casting it to char*. Namely
not to return the address of the string, but instead to return the actual data.
very easy to manipulate text data read from a file in-place, without useless copy of buffer,
just insert zeroes at th...
What is &&& operation in C
... used sometimes for defaults. Example: void fn(type& x = *reinterpret_cast<type*>(NULL)); What is the value of &x in fn if fn is called without parameters? It's 0 a.k.a. false. However, using it the way described, it'll always be true unless i == 0, and if one was using it as I des...
Does static constexpr variable inside a function make sense?
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@AndrewLazarus, you can't cast away const from a const object, only from a const X* which points to an X. But that's not the point; the point is that automatic objects cannot have static addresses. As I said, constexpr ceases to be meaningful once the...
What does an exclamation mark mean in the Swift language?
...eLabel!.text
Implicitly unwrapped optionals: var logo: UIImageView!
Forced casting: logo.image = thing as! UIImage
Unhandled exceptions: try! NSJSONSerialization.JSONObjectWithData(data, [])
Every one of these is a different language construct with a different meaning, but they all have three impo...
C++ unordered_map using a custom class type as the key
...cpp file but I am getting the following error: Error 57 error C2440: 'type cast' : cannot convert from 'const Key' to 'size_t' c:\program files (x86)\microsoft visual studio 10.0\vc\include\xfunctional. I am guessing that the compiler is not finding my hash method? Should I be adding anything to m...