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What are copy elision and return value optimization?
... is an optimization implemented by most compilers to prevent extra (potentially expensive) copies in certain situations. It makes returning by value or pass-by-value feasible in practice (restrictions apply).
It's the only form of optimization that elides (ha!) the as-if rule - copy elision can be a...
JUnit 4 Test Suites
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You can create a suite like so. For example an AllTest suite would look something like this.
package my.package.tests;
@RunWith(Suite.class)
@SuiteClasses({
testMyService.class,
testMyBackend.class,
...
})
public class AllTests {}
Now you can run this in ...
Guards vs. if-then-else vs. cases in Haskell
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From a technical standpoint, all three versions are equivalent.
That being said, my rule of thumb for styles is that if you can read it as if it was English (read | as "when", | otherwise as "otherwise" and = as "is" or "be"), you're probably doing some...
AngularJS $http and $resource
I have some web services that I want to call. $resource or $http , which one should I use?
10 Answers
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Table is marked as crashed and should be repaired
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Run this from your server's command line:
mysqlcheck --repair --all-databases
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Is the NOLOCK (Sql Server hint) bad practice?
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It is occassionally useful, but not normally for production. I use it frequently for pulling out a sample of data to test with or for generating reports where I mostly care about rough order of magnitude where a dirty read won't matter.
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jQuery remove options from select
I have a page with 5 selects that all have a class name 'ct'. I need to remove the option with a value of 'X' from each select while running an onclick event. My code is:
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How to use NULL or empty string in SQL
...pty string. REASON: if there is ONLY whitespace, a single trim will remove all of it. For example, you don't care whether the comparison fails because what remains is "abc" or " abc".
– ToolmakerSteve
Dec 9 '16 at 20:06
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.toArray(new MyClass[0]) or .toArray(new MyClass[myList.size()])?
... the result may be different.
Benchmark results (score in microseconds, smaller = better):
Benchmark (n) Mode Samples Score Error Units
c.a.p.SO29378922.preSize 1 avgt 30 0.025 ▒ 0.001 us/op
c.a.p.SO29378922.preSize 100 avgt 30 0.15...
HTTP URL Address Encoding in Java
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@Mohamed: the class I mentioned and used for testing actually is java.net.URI: it worked perfectly (Java 1.6). I would mention the fully qualified class name if it was not the standard Java one and the link points to the documentation of java.net.URI. And, by the comment of Sudhaka...