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When is std::weak_ptr useful?
...ts and it points to nullptr when the object pointed is deleted/not pointed by any other pointers anymore?
– user1434698
Aug 19 '12 at 23:16
30
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What does Java option -Xmx stand for? [duplicate]
...here: Java Tool Doc, it says,
-Xmxn
Specify the maximum size, in bytes, of the memory allocation pool. This value must a multiple of 1024 greater than 2MB. Append the letter k or K to indicate kilobytes, or m or M to indicate megabytes. The default value is 64MB. The upper limit for this v...
Underscore: sortBy() based on multiple attributes
...
sortBy says that it is a stable sort algorithm so you should be able to sort by your second property first, then sort again by your first property, like this:
var sortedArray = _(patients).chain().sortBy(function(patient) {
...
How can you use an object's property in a double-quoted string?
... you enclose a variable name in a double-quoted string it will be replaced by that variable's value:
$foo = 2
"$foo"
becomes
"2"
If you don't want that you have to use single quotes:
$foo = 2
'$foo'
However, if you want to access properties, or use indexes on variables in a double-quoted st...
What is “android:allowBackup”?
...application's data can be backed up and restored, as documented here.
By default, this flag is set to true. When this flag is set to true, application data can be backed up and restored by the user using adb backup and adb restore.
This may have security consequences for an application. ad...
What is the http-header “X-XSS-Protection”?
...
X-XSS-Protection is a HTTP header understood by Internet Explorer 8 (and newer versions).
This header lets domains toggle on and off the "XSS Filter" of IE8, which prevents some categories of XSS attacks.
IE8 has the filter activated by default, but servers can switch i...
What is the difference between POST and GET? [duplicate]
... web applications. One reason for this is that GET may be used arbitrarily by robots or crawlers, which should not need to consider the side effects that a request should cause.
and
POST submits data to be processed (e.g., from an HTML form) to the identified resource. The data is included in...
Circle line-segment collision detection algorithm?
...Vector from center sphere to ray start )
Then the intersection is found by..
Plugging:
P = E + t * d
This is a parametric equation:
Px = Ex + tdx
Py = Ey + tdy
into
(x - h)2 + (y - k)2 = r2
(h,k) = center of circle.
Note: We've simplified the problem to 2D here, the solution we get applies ...
Efficiently convert rows to columns in sql server
...(ColumnName)
from yourtable
group by ColumnName, id
order by id
FOR XML PATH(''), TYPE
).value('.', 'NVARCHAR(MAX)')
,1,1,'')
set @query = N'SELECT ' + @cols + N' from
(
selec...
Passing a 2D array to a C++ function
...
Fixed Size
1. Pass by reference
template <size_t rows, size_t cols>
void process_2d_array_template(int (&array)[rows][cols])
{
std::cout << __func__ << std::endl;
for (size_t i = 0; i < rows; ++i)
{
...