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How does virtual inheritance solve the “diamond” (multiple inheritance) ambiguity?
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You want: (Achievable with virtual inheritance)
A
/ \
B C
\ /
D
And not: (What happens without virtual inheritance)
A A
| |
B C
\ /
D
Virtual inheritance means that there will be only 1 instance of the base A ...
How to detect Safari, Chrome, IE, Firefox and Opera browser?
...ts in checking the User agent string. This method is not reliable, because it's trivial to spoof this value.
I've written a method to detect browsers by duck-typing.
Only use the browser detection method if it's truly necessary, such as showing browser-specific instructions to install an extension. ...
What is difference between functional and imperative programming languages?
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Definition:
An imperative language uses a sequence of statements to determine how to reach a certain goal. These statements are said to change the state of the program as each one is executed in turn.
Examples:
Java is an imperat...
Get user profile picture by Id
...follow
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edited Feb 19 '15 at 6:01
coderama
13.4k3838 gold badges143143 silver badges276276 bronze badges
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nginx - nginx: [emerg] bind() to [::]:80 failed (98: Address already in use)
...g on port 80 and also on port [::]:80.
I had the following in my default sites-available file:
listen 80;
listen [::]:80 default_server;
You can fix this by adding ipv6only=on to the [::]:80 like this:
listen 80;
listen [::]:80 ipv6only=on default_server;
For more information, see:
http://fo...
Best way to store password in database [closed]
... a salt (which should be different for every user) and a secure 1-way algorithm and store that, throwing away the original password. Then, when you want to verify a password, you hash the value (using the same hashing algorithm and salt) and compare it to the hashed value in the database.
So, while...
What exceptions should be thrown for invalid or unexpected parameters in .NET?
...d ArgumentOutOfRangeException.
ArgumentException – Something is wrong with the argument.
ArgumentNullException – Argument is null.
ArgumentOutOfRangeException – I don’t use this one much, but a common use is indexing into a collection, and giving an index which is to large.
There are oth...
Run PHP Task Asynchronously
...de where I need to complete some task, but I don't want to make the user wait for the result. For example, when creating a new account, I need to send them a welcome email. But when they hit the 'Finish Registration' button, I don't want to make them wait until the email is actually sent, I just wan...
How to test an Android Library Project
I am writing an Android Library Project basing on Android Bitmap class (call it AndroindLib) which contains only utility class (no activity). I tried to test it using Android JUnit, but it keeps complaining that can't find the AnroidLib.apk
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Is there a W3C valid way to disable autocomplete in a HTML form?
When using the xhtml1-transitional.dtd doctype, collecting a credit card number with the following HTML
17 Answers
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