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Is Meyers' implementation of the Singleton pattern thread safe?
Is the following implementation, using lazy initialization, of Singleton (Meyers' Singleton) thread safe?
6 Answers
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What is the most efficient way to concatenate N arrays?
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I believe your test may have an error: the a.concat(b) test case seems to be needlessly making a copy of the array a then throwing it away.
– ninjagecko
Apr 22 '12 at 21:35
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Getting the parent of a directory in Bash
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Running that code gives me the error bash: dirname 'Test': syntax error: invalid arithmetic operator (error token is "'Test'"). Linked code is also wrong.
– Michael Hoffman
Dec 8 '11 at 4:22
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Is it possible to dynamically compile and execute C# code fragments?
... select i;
}
}");
results.Errors.Cast<CompilerError>().ToList().ForEach(error => Console.WriteLine(error.ErrorText));
}
}
The class of primary importance here is the CSharpCodeProvider which utilises the compiler to compile code on the ...
How to tell if a string is not defined in a Bash shell script
...o use a default value, ${foo:=default} to assign the default value, ${foo:?error message} to display an error message if foo is unset, etc.
– Jouni K. Seppänen
Oct 23 '08 at 4:54
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How would you do a “not in” query with LINQ?
... But i use linq to entities , so i get "only primitive types can be used error". Is there any work around...? apart from manually iterating and finding the list.
– Novice
Aug 3 '11 at 11:52
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What is the difference between SqlCommand.CommandTimeout and SqlConnection.ConnectionTimeout?
...eeds SqlCommand.CommandTimeout, then it stops execution. A command timeout error will occur.
SqlConnection.ConnectionTimeout = timeout limit for your connection. Means, how much time your connection object can try to connect. If it exceeds the specified time, it stops connecting. A connection timeo...
Difference between 'struct' and 'typedef struct' in C++?
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If you just said:
struct Foo { ... };
Foo x;
you would get a compiler error, because Foo is only defined in the tag namespace.
You'd have to declare it as:
struct Foo x;
Any time you want to refer to a Foo, you'd always have to call it a struct Foo. This gets annoying fast, so you can add...
Get file name from URL
... get rid of the file extension, here's a way to do it without resorting to error-prone String manipulation and without using external libraries. Works with Java 1.7+:
import java.net.URI
import java.nio.file.Paths
String url = "http://example.org/file?p=foo&q=bar"
String filename = Paths.get(n...
Delete all documents from index/type without deleting type
...atic since it silently forces a refresh which can quickly cause OutOfMemoryError during concurrent indexing" elastic.co/guide/en/elasticsearch/reference/1.7/…
– usef_ksa
Jan 14 '16 at 9:51
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