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Awkward way of executing JavaScript code [duplicate]
...
var a = (function() {
return foo(bar);
})();
In this case this is really unnecessary, but this is not wrong and it will not throw an error.
But IIF some times uses like module pattern:
var a = (function() {
/* some other code in own scope */
retu...
Boost智能指针——shared_ptr - C/C++ - 清泛网 - 专注C/C++及内核技术
...st文档上特地注明的标准bad Practices）：
void test()
{
foo(boost::shared_ptr<implementation>(new implementation()), g());
}
正确的用法为：
void test()
{
boost::shared_ptr<implementation> sp(new implementation());
foo(sp, g());
}
shared_ptr 智能指...
/usr/include/c++/4.9/bits/stl_iterator_base_types.h:165:53: error: ‘i...
...e[1])
或者将distance放在一个命名空间中,例如：
namespace foo
{
double distance(int a, int b)
{
return fabs(a-b);
}
}
int main()
{
foo::distance(x,y); //now you're calling your own distance function.
}
或者不使用命名空间std,显式声明std::vector...
Why is this F# code so slow?
...es generic comparison (I thought this uses just IComparable, but it is actually more complicated - it would use structural comparison for F# types and it's fairly complex logic).
> let min3(a, b, c) = min a (min b c);;
val min3 : 'a * 'a * 'a -> 'a when 'a : comparison
In the C# version, ...
Difference between static class and singleton pattern?
...s you say that either a singleton or a static method isn't thread-safe? Usually both should be implemented to be thread-safe.
The big difference between a singleton and a bunch of static methods is that singletons can implement interfaces (or derive from useful base classes, although that's less co...
MySQL/SQL: Group by date only on a Datetime column
...
Cast the datetime to a date, then GROUP BY using this syntax:
SELECT SUM(foo), DATE(mydate) FROM a_table GROUP BY DATE(a_table.mydate);
Or you can GROUP BY the alias as @orlandu63 suggested:
SELECT SUM(foo), DATE(mydate) DateOnly FROM a_table GROUP BY DateOnly;
Though I don't think it'll make...
How can I position my div at the bottom of its container?
...s absolute or relatively position in order to determine it's position. If all fails it resorts to body (window). So hence the need for the parent to be relative.
– user17753
Jun 13 '12 at 18:46
...
Spring @Autowired usage
...n having a "centralized, declarative, configuration" like the xml files we all used to use. Then I realized that most of the stuff in the files wasn't configuration - it was never changed anywhere after development, ever. Then I realized that "centralized" only has value in quite small systems - onl...
How to get label of select option with jQuery?
...layed text for both styles of <option> elements:
<option label="foo"><option> -> "foo"
<option>bar<option> -> "bar"
If it has both a label attribute and text inside the element, it'll use the label attribute, which is the same behavior as the browser.
For pos...
How to write a Ruby switch statement (case…when) with regex and backreferences?
...egex matching groups are always stored in pseudo variables $1 to $9:
case foo
when /^([0-9][0-9])/
print "the month is #{$1}"
else
print "something else"
end
You can also use the $LAST_MATCH_INFO pseudo variable to get at the whole MatchData object. This can be useful when using named cap...