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How does the bitwise complement operator (~ tilde) work?
...representation of a number, taking its complement (inverting all the bits) and adding one. Two starts as 0000 0010, and by inverting the bits we get 1111 1101. Adding one gets us the result above. The first bit is the sign bit, implying a negative.
So let's take a look at how we get ~2 = -3:
Here's ...
How to comment out a block of Python code in Vim
...rst column of the first line you want to comment.
Step 2: Press: Ctrl+v and select the lines you want to comment:
Step 3: Shift-I#space (Enter Insert-at-left mode, type chars to insert. The selection will disappear, but all lines within it will be modified after Step 4.)
Step 4: Esc
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Parse (split) a string in C++ using string delimiter (standard C++)
...npos) function returns a substring of the object, starting at position pos and of length npos.
If you have multiple delimiters, after you have extracted one token, you can remove it (delimiter included) to proceed with subsequent extractions (if you want to preserve the original string, just use...
How to create an alias for a command in Vim?
Vim is my preferred text editor when I program, and thus I always run into a particularly annoying issue.
7 Answers
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How can I create an executable JAR with dependencies using Maven?
.../configuration>
</plugin>
</plugins>
</build>
and you run it with
mvn clean compile assembly:single
Compile goal should be added before assembly:single or otherwise the code on your own project is not included.
See more details in comments.
Commonly this goal is t...
Encrypt & Decrypt using PyCrypto AES 256
...build two functions using PyCrypto that accept two parameters: the message and the key, and then encrypt/decrypt the message.
...
How to avoid reinstalling packages when building Docker image for Python projects?
...rements.txt /srv before you run pip (RUN pip install -r requirements.txt), and add all of the other files after running pip. Thus, they should be in the following order: (1) ADD requirements.txt /srv; (2) RUN pip install -r requirements.txt; (3) ADD . /srv
– engelen
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How to repair a serialized string which has been corrupted by an incorrect byte count length?
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Baba, I used your amazing findSerializeError function and found a lots of errors. Please take a look at my topic
– Max Koretskyi
Oct 19 '13 at 17:39
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Regexp Java for password validation
...dependent "module".
The (?=.*[xyz]) construct eats the entire string (.*) and backtracks to the first occurrence where [xyz] can match. It succeeds if [xyz] is found, it fails otherwise.
The alternative would be using a reluctant qualifier: (?=.*?[xyz]). For a password check, this will hardly mak...
Embedding unmanaged dll into a managed C# dll
...if you extract it yourself to a temporary directory during initialization, and load it explicitly with LoadLibrary before using P/Invoke. I have used this technique and it works well. You may prefer to just link it to the assembly as a separate file as Michael noted, but having it all in one file ha...