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What's the difference between the atomic and nonatomic attributes?
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The last two are identical; "atomic" is the default behavior (note that it is not actually a keyword; it is specified only by the absence of nonatomic -- atomic was added as a keyword in recent versions of llvm/clang).
Assuming that you are @synthesizing the method implementa...
Ruby: kind_of? vs. instance_of? vs. is_a?
...e_of? is different from the other two in that it only returns true if the object is an instance of that exact class, not a subclass.
Example:
"hello".is_a? Object and "hello".kind_of? Object return true because "hello" is a String and String is a subclass of Object.
However "hello".instance_of? O...
Add number of days to a date
I want to add number of days to current date:
I am using following code:
19 Answers
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Remove last item from array
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CroMagnon
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answered Oct 23 '13 at 14:25
AntonAnton
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What are the rules for calling the superclass constructor?
What are the C++ rules for calling the superclass constructor from a subclass one?
10 Answers
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Reason for Column is invalid in the select list because it is not contained in either an aggregate f
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Suppose I have the following table T:
a b
--------
1 abc
1 def
1 ghi
2 jkl
2 mno
2 pqr
And I do the following query:
SELECT a, b
FROM T
GROUP BY a
The output should have two rows, one row where a=1 and a second row where a=2.
But what ...
jQuery how to find an element based on a data-attribute value?
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You have to inject the value of current into an Attribute Equals selector:
$("ul").find(`[data-slide='${current}']`)
For older JavaScript environments (ES5 and earlier):
$("ul").find("[data-slide='" + current + "']");
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Git: “Not currently on any branch.” Is there an easy way to get back on a branch, while keeping the
So I've done some work in the repository and when I'm about to commit I realize that I'm not currently on any branch.
9 Ans...
Finishing current activity from a fragment
I have a fragment in an activity that I am using as a navigation drawer. It contains buttons that when clicked start new activities (startActivity from a fragment simply calls startActivity on the current activity).
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Read file line by line using ifstream in C++
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The two standard methods are:
Assume that every line consists of two numbers and read token by token:
int a, b;
while (infile >> a >> b)
{
// process pair (a,b)
}
Line-based parsing, using string streams:
#include <sstream>
#include <string>
std::string line;
while...