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Pointer to class data member “::*”
...
It's a "pointer to member" - the following code illustrates its use:
#include <iostream>
using namespace std;
class Car
{
public:
int speed;
};
int main()
{
int Car::*pSpeed = &Car::speed;
Car c1;
c1.speed = 1; // direct access
cout << "speed is ...
What is the X-REQUEST-ID http header?
...lient can create some random ID and pass it to the server. The server then include that ID in every log statement that it creates. If a client receives an error it can include the ID in a bug report, allowing the server operator to look up the corresponding log statements (without having to rely on ...
python requests file upload
...file field set to the contents of the file.txt file.
The filename will be included in the mime header for the specific field:
>>> import requests
>>> open('file.txt', 'wb') # create an empty demo file
<_io.BufferedWriter name='file.txt'>
>>> files = {'upload_file'...
Scalar vs. primitive data type - are they the same thing?
...e type). In Python, everything is (conceptually) an object/reference type, including strings (and numbers).
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Explaining difference between automaticallyAdjustsScrollViewInsets, extendedLayoutIncludesOpaqueBars
... case (YES), it will start from below the navigation bar.
extendedLayoutIncludesOpaqueBars
This value is just an addition to the previous ones. By default, this parameter is set to NO. If the status bar is opaque, the views won't be extended to include the status bar, even if you extend your vie...
How to set up a PostgreSQL database in Django
...it /etc/apache2/apache2.conf
Add the following line to the opened file:
Include /etc/apache2/conf.d/phppgadmin
Now reload apache. Use terminal.
sudo /etc/init.d/apache2 reload
Now you will have to create a new database. Login as 'postgres' user. Continue in terminal.
sudo su - postgres
In...
Convert Django Model object to dict with all of the fields intact
...vert a Django Model object to a dict with all of its fields? All ideally includes foreign keys and fields with editable=False .
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CentOS+Nginx+PHP+MySQL详细配置(图解) - PHP - 清泛IT论坛，有思想、有深度
...ir /usr/local/jpeg/bin
#mkdir /usr/local/jpeg/lib
#mkdir /usr/local/jpeg/include
#mkdir /usr/local/jpeg/man
#mkdir /usr/local/jpeg/man/man1
#tar xvf jpegsrc.v7.tar.tar
#cd jpeg-7
#./configure --prefix=/usr/local/jpeg --enable-shared --enable-static
#make;make install
#ln -s /usr/local/jpeg/...
Detect if an input has text in it using CSS — on a page I am visiting and do not control?
.../ @name _Dynamically style inputs based on whether they are blank.
// @include http://YOUR_SERVER.COM/YOUR_PATH/*
// @grant GM_addStyle
// ==/UserScript==
/*- The @grant directive is needed to work around a design change
introduced in GM 1.0. It restores the sandbox.
*/
var inpsToMoni...
Can someone explain in simple terms to me what a directed acyclic graph is?
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You have to include "where the lines do not form cycles", otherwise you're just describing a directed graph, not a directed acyclic graph.
– Pharap
Mar 13 '19 at 13:42
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