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C++11 rvalues and move semantics confusion (return statement)
I'm trying to understand rvalue references and move semantics of C++11.
6 Answers
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Why are Where and Select outperforming just Select?
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Select iterates once over the entire set and, for each item, performs a conditional branch (checking for validity) and a + operation.
Where+Select creates an iterator that skips invalid elements (doesn't yield them), performing a + only on the valid items.
So, the...
What is the purpose of Rank2Types?
...morphic. In the example map uses id as if it had type String -> String. And of course you can also pass a simple monomorphic function of the given type instead of id. Without rank2types there is no way for a function to require that its argument must be a polymorphic function and thus also no way...
Backing beans (@ManagedBean) or CDI Beans (@Named)?
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I've created beans.xml, converted @ManagedBean backing beans to @Named, and converted @ManagedProperty to @Inject. All is well with the world. However, if I change my @EJB annotations to @Inject, deployment fails (org.jboss.weld.exceptions.Deploymen...
C＋＋模板的特化 - C/C++ - 清泛网 - 专注C/C++及内核技术
...stantiation;
notes: the compiler will use f3 as the instantiation for f1, and use f2 as the specialization for f1;
rule: specialization must be before instantiation (*);
Above we have discuss the template function, and then we'll focus on member template function.
acronym: MTF(member templat...
What is the size of an enum in C?
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Taken from the current C Standard (C99): http://www.open-std.org/JTC1/SC22/WG14/www/docs/n1256.pdf
6.7.2.2 Enumeration specifiers
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Constraints
The expression that defines the value of an enumeration constant shall be an integer
constan...
How can I disable ARC for a single file in a project?
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For Xcode 4.3 the easier way might be: Edit/Refactor/Convert to objective-C ARC, then check off the files you don't want to be converted. I find this way the same as using the compiler flag above.
shar...
Procedure expects parameter which was not supplied
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I would check my application code and see what value you are setting @template to. I suspect it is null and therein lies the problem.
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What's the best practice to round a float to 2 decimals? [duplicate]
I'm using eclipse + Android SDK.
7 Answers
7
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Changing names of parameterized tests
...r value from this invocation of the test.
{1} - the second parameter value
and so on
The final name of the test will be the name of the test method, followed by the namestring in brackets, as shown below.
For example (adapted from the unit test for the Parameterized annotation):
@RunWith(Paramet...