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Why should I declare a virtual destructor for an abstract class in C++?
...t a virtual destructor.
You will eventually end up with no virtual method table, and end up signalling your clients your intention on making it non-deleteable through a pointer to it, so you have indeed reason not to declare it virtual in those cases.
[See item 4 in this article: http://www.gotw....
What are '$$' used for in PL/pgSQL
...is +999 999'';
END IF;
RETURN true;
END
' LANGUAGE plpgsql STRICT IMMUTABLE;
This isn't such a good idea. Use dollar-quoting instead, more specifically also put a token between the $$ to make it unique - you might want to use $-quotes inside the function body, too. I do that a lot, actually.
...
Why does sun.misc.Unsafe exist, and how can it be used in the real world?
...
VM "intrinsification." ie CAS (Compare-And-Swap) used in Lock-Free Hash Tables
eg:sun.misc.Unsafe.compareAndSwapInt
it can make real JNI calls into native code that contains special instructions for CAS
read more about CAS here http://en.wikipedia.org/wiki/Compare-and-swap
The sun.misc.Unsafe fu...
Solr vs. ElasticSearch [closed]
...Maturity: Solr is more mature, but ES has grown rapidly and I consider it stable
Performance: hard to judge. I/we have not done direct performance benchmarks. A person at LinkedIn did compare Solr vs. ES vs. Sensei once, but the initial results should be ignored because they used non-expert setup ...
Non-static method requires a target
...rties. If there are Foreign Key references (Navigation Properties) between tables and you use those references in your lambda (e.g. ProductDetail.Products.ID) then that "Products" context remains null if you manually created the Entity.
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Get key by value in dictionary
...he problem can be easily generalised. For example you could have a look up table with unique keys and their corresponding unique values. You can then look up things symmetrically value --> key or key --> value
– pfabri
May 13 at 16:34
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Image width/height as an attribute or in CSS? [duplicate]
...entational attributes regardless of where you put them. For semantics we establish what the image means to content in the alt tag. I don't remember why it was so important to width/height in the HTML but I suspect it was in case you hit browsers without CSS rendering. It's not a semantics issue. If ...
Rolling or sliding window iterator?
...I changed it to individually look up and add items in a window of ten, the tables turned and the tee method was 20% faster. I was able to recover some speed by using negative indexes for the last five terms in the addition, but tee was still a little faster. Overall I would estimate that either one ...
How to replace all occurrences of a string?
...eforehand or will only pass strings that are without the characters in the table in Regular Expressions (MDN).
MDN also provides an implementation to escape our strings. It would be nice if this was also standardized as RegExp.escape(str), but alas, it does not exist:
function escapeRegExp(str) {
...
Disable messages upon loading a package
...
not really, try library(data.table, quietly = TRUE)
– Gaurav Singhal
Jul 2 '18 at 8:40
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