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Difference between dispatch_async and dispatch_sync on serial queue?
...spatch_async return after it is added to the queue and may not finished.
for this code
dispatch_async(_serialQueue, ^{ printf("1"); });
printf("2");
dispatch_async(_serialQueue, ^{ printf("3"); });
printf("4");
It may print 2413 or 2143 or 1234 but 1 always before 3
for this code
dispatch_sync...
Creating an index on a table variable
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The question is tagged SQL Server 2000 but for the benefit of people developing on the latest version I'll address that first.
SQL Server 2014
In addition to the methods of adding constraint based indexes discussed below SQL Server 2014 also allows non unique indexes...
How do I list one filename per output line in Linux?
I'm using ls -a command to get the file names in a directory, but the output is in a single line.
7 Answers
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How is the 'use strict' statement interpreted in Node.js? [duplicate]
I have started to explore the Node.js and wrote many demo web application, to understand the flow of Node.js, Express.js, jade, etc..
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How is the “greater than” or “>” character used in CSS?
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It's a CSS child selector. P > SPAN means applying the style that follows to all SPAN tags that are children of a P tag.
Note that "child" means "immediate descendant", not just any descendant. P SPAN is a descendant selector, applying the styl...
Column order manipulation using col-lg-push and col-lg-pull in Twitter Bootstrap 3
...w reading documentation on Twitter Bootstrap 3, and tried to follow column ordering as shown in this page but hit the wall. I don't understand why such a code works nor how to correctly specify the setting. What I want to show is one grid, which is consisted of length 5, and the other length 5, ...
How do I verify a method was called exactly once with Moq?
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You can use Times.Once(), or Times.Exactly(1):
mockContext.Verify(x => x.SaveChanges(), Times.Once());
mockContext.Verify(x => x.SaveChanges(), Times.Exactly(1));
Here are the methods on the Times class:
AtLeast - Specifies that a mocked me...
A field initializer cannot reference the nonstatic field, method, or property
I have a class and when I try to use it in another class I receive the error below.
4 Answers
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is there a css hack for safari only NOT chrome?
im trying to find a css hack for just safari NOT chrome, i know these are both webkit browsers but im having problems with div alignments in chrome and safari, each displays differently.
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Do c++11 lambdas capture variables they don't use?
...a, will that result in all local variables in the function being copied, or just all local variables that are used by the lambda ?
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