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Pimpl idiom vs Pure virtual class interface
...by "value". Often, doesn't make sense to "copy" instances of the class at all. When it does make sense, a polymorphic "Clone" method is usually more appropriate. Examples: A Socket class, a Database class, a "policy" class, anything that would be a "closure" in a functional language.
Both pImpl ...
Which is faster: Stack allocation or Heap allocation
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Stack allocation is much faster since all it really does is move the stack pointer.
Using memory pools, you can get comparable performance out of heap allocation, but that comes with a slight added complexity and its own headaches...
When should I use perror(“…”) and fprintf(stderr, “…”)?
...should use fprintf(stderr, fmt, ...). For example, strtol will return LONG_MAX or LONG_MIN if a string is out of range and set errno to ERANGE. So if strtol fails due to out of range, I would use perror.
– freeboy1015
Aug 24 '12 at 2:22
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Who sets response content-type in Spring MVC (@ResponseBody)
...operty>
</bean>
However, using this method you have to redefine all HttpMessageConverters, and also it doesn't work with <mvc:annotation-driven />.
So, perhaps the most convenient but ugly method is to intercept instantiation of the AnnotationMethodHandlerAdapter with BeanPostProce...
Android: how do I check if activity is running?
... activities that link to each other then onStop on the first is sometimes called after onStart in second. So both might be true briefly.
Depending on what you are trying to do (update the current activity from a service?). You could just register a static listener in the service in your activity on...
Generating a drop down list of timezones with PHP
...generate your list.
$tzlist = DateTimeZone::listIdentifiers(DateTimeZone::ALL);
Also, I would use PHP's names for the 'timezones' and forget about GMT offsets, which will change based on DST.
Code like that in phpbb is only that way b/c they are still supporting PHP4 and can't rely on the DateTim...
PostgreSQL query to list all table names?
Is there any query available to list all tables in my Postgres DB.
7 Answers
7
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Strip whitespace from jsp output
...s whitespace left by taglibs like JSTL and scriptlets. If you want to trim ALL whitespace from HTML, then head for a different solution. You can find a filter example here: balusc.blogspot.com/2007/12/whitespacefilter.html
– BalusC
Apr 19 '10 at 13:27
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How to stage only part of a new file with git?
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Whoa, all that update-index and hash-object business seems overly complicated. How about this instead:
git add -N new_file
git add -i
From git help add:
-N, --intent-to-add
Record only the fact that the path will be added ...
What is the difference between a.getClass() and A.class in Java?
...getClass() will return the B class.
A.class evaluates to the A class statically, and is used for other purposes often related to reflection.
In terms of performance, there may be a measurable difference, but I won't say anything about it because in the end it is JVM and/or compiler dependent.
T...