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Using the RUN instruction in a Dockerfile with 'source' does not work
...
This is not correct even though it works. Read docs.docker.com/engine/reference/builder/#run and don't stop after the second code sample. Read the Note: that immediately follows. Because /bin/sh -c is the default shell, this "shell form" of RUN translates to RUN ["/b...
In C++, what is a virtual base class?
...ss D : public B, public C {};
The above class hierarchy results in the "dreaded diamond" which looks like this:
A
/ \
B C
\ /
D
An instance of D will be made up of B, which includes A, and C which also includes A. So you have two "instances" (for want of a better expression) of A.
When...
Is it bad practice to make a setter return “this”?
...me of the rationale for fluent interfaces is that they make code easier to read. I could see it being more convenient to write, but it kinda strikes me as being harder to read. That's the only real disagreement I have with it.
– Brent Writes Code
Aug 28 '09 at...
#pragma pack effect
...64 or 4096 byte boundary buys you nothing above what the 8 byte boundary already gave you. You'll get the same performance from the CPU, while getting much worse cache utilization for the reasons outlined in that post.
– jalf
May 14 '15 at 18:30
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How do I convert an enum to a list in C#? [duplicate]
...uperfluous, and will mean extra copying. Enum.GetValues returns an array already, so you just have to do var values = (SomeEnum[])Enum.GetValues(typeof(SomeEnum))
– thecoop
Nov 9 '10 at 2:33
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Will strlen be calculated multiple times if used in a loop condition?
...is only true if ss is not changed in for loop.
For example, if you use a read-only function on ss in for loop but don't declare the ss-parameter as const, the compiler cannot even know that ss is not changed in the loop and has to calculate strlen(ss) in every iteration.
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How to upload files to server using JSP/Servlet?
... users for years. Such a library has proven its robustness.
When you're already on Servlet 3.0 or newer, use native API
If you're using at least Servlet 3.0 (Tomcat 7, Jetty 9, JBoss AS 6, GlassFish 3, etc), then you can just use standard API provided HttpServletRequest#getPart() to collect the in...
How to store date/time and timestamps in UTC time zone with JPA and Hibernate
...that they transform dates to/from the current JVM timezone by default when reading and writing from/to the database.
I came up with a solution to this in Hibernate 3.5 by subclassing org.hibernate.type.TimestampType that forces these JDBC methods to use UTC instead of the local time zone:
public c...
How do I get Windows to go as fast as Linux for compiling C++?
...lookup times, with a btree structure. In Linux (last I looked), an app can read an entire folder with a single system call, and iterate through the resulting structure entirely in user code; Windows requires a separate sys call for each file. Either way, compilers shouldn't need to read the entire f...
Return HTTP status code 201 in flask
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You can read about it here.
return render_template('page.html'), 201
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