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What are C++ functors and their uses?
...about functors in C++. Can someone give me an overview as to what they are and in what cases they would be useful?
14 Answe...
Default value to a parameter while passing by reference in C++
...ifferent address to the function? or will the address of State be always 0 and so meaningless?
– Sony
Jun 29 '09 at 18:10
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How to define “type disjunction” (union types)?
...: String => println("str")
case _: Int => println("int")
}
}
And that's it. You can call foo(5) or foo("abc"), and it will work, but try foo(true) and it will fail. This could be side-stepped by the client code by creating a StringOrInt[Boolean], unless, as noted by Randall below, you ...
Any shortcut to initialize all array elements to zero?
...ger[0]);
Would give arr the value:
[42, 42, 42]
(though it's Integer, and not int, if you need the primitive type you could defer to the Apache Commons ArrayUtils.toPrimitive() routine:
int [] primarr = ArrayUtils.toPrimitive(arr);
...
onMeasure custom view explanation
I tried to do custom component. I extended View class and do some drawing in onDraw overrided method. Why I need to override onMeasure ? If I didn't, everything seen to be right. May someone explain it? How should I write my onMeasure method? I've seen couple tutorials, but each one is a litt...
Pick a random element from an array
Suppose I have an array and I want to pick one element at random.
16 Answers
16
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How do I generate a random int number?
How do I generate a random integer in C#?
32 Answers
32
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What is an “unwrapped value” in Swift?
I'm learning Swift for iOS 8 / OSX 10.10 by following this tutorial , and the term " unwrapped value " is used several times, as in this paragraph (under Objects and Class ):
...
C# Java HashMap equivalent
...ou should be aware of:
Adding/Getting items
Java's HashMap has the put and get methods for setting/getting items
myMap.put(key, value)
MyObject value = myMap.get(key)
C#'s Dictionary uses [] indexing for setting/getting items
myDictionary[key] = value
MyObject value = myDictionary[key]
nu...
When to use extern in C++
I'm reading "Think in C++" and it just introduced the extern declaration. For example:
4 Answers
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