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When and why will a compiler initialise memory to 0xCD, 0xDD, etc. on malloc/free/new/delete?
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It's compiler and OS specific, Visual studio sets different kinds of memory to different values so that in the debugger you can easily see if you have overun into into malloced memory, a fixed array or an uninitialised object.
Somebody will post the details while I am g...
c# datatable to csv
...e code below does is programmatically create a DataGridView on the fly and set the DataGridView.DataSource to the DataTable. Next, I programmatically select all the cells (including the header) in the DataGridView and call DataGridView.GetClipboardContent(), placing the results into the Windows Clip...
Check if an apt-get package is installed and then install it if it's not on Linux
...u 12.04 ) returns 0, causing all sorts of trouble on my jenkins build node setup script! dpkg -s returns 0 on package installed, and 1 on package not installed.
– Therealstubot
Aug 21 '13 at 21:04
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ALTER TABLE to add a composite primary key
...place);
are not the the same thing.
They both enforce uniqueness on that set of three fields, however from an indexing standpoint there is a difference. The fields are indexed from left to right.
For example, consider the following queries:
A) SELECT person, place, thing FROM provider WHERE pers...
Boolean Field in Oracle
...or false and 1 for true so it can work
correctly with the getBoolean and setBoolean functions.
Basically they advocate method number 2, for efficiency's sake, using
values of 0/1 (because of interoperability with JDBC's getBoolean() etc.) with a check constraint
a type of CHAR (because it use...
Find full path of the Python interpreter?
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It seems that _ is set by the shell. But it need not be set, so this could give the wrong answer.
– vy32
Sep 23 '15 at 0:40
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Compare given date with today
...For the correct timezone, you can use, for example,
date_default_timezone_set('America/New_York');
Click here to refer to the available PHP Timezones.
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Do checkbox inputs only post data if they're checked?
...e user. A switch is "on" when the control element's checked
attribute is set. When a form is submitted, only "on" checkbox
controls can become successful.
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How can I force clients to refresh JavaScript files?
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Chrome REQUIRES these settings in order to cache properly. Without them, Chrome will cache a file forever. Mozilla uses a much more reasonable default. See more at: agiletribe.wordpress.com/2018/01/29/caching-for-chrome
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are there dictionaries in javascript like python?
...ocat states. Look up the details in MDN. Example:
let map = new Map();
map.set('key', {'value1', 'value2'});
let values = map.get('key');
Without support for ES6 you can try using objects:
var x = new Object();
x["Key"] = "Value";
However with objects it is not possible to use typical array proper...