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std::enable_if to conditionally compile a member function
...to another class, then inherit from that class. You may have to change the order of inheritence to get access to all of the other underlying data but this technique does work.
template< class T, bool condition> struct FooImpl;
template<class T> struct FooImpl<T, true> {
T foo() { ...
SQL query to get all values a enum can have
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If enumeration order is important, append ORDER BY e.enumsortorder to the query. The enumerated values will most likely be out of order if new values were inserted into the enumeration type using BEFORE or AFTER.
– Cli...
Version number comparison in Python
... cmp() has been removed in Python 3: docs.python.org/3.0/whatsnew/3.0.html#ordering-comparisons
– Dominic Cleal
May 12 '14 at 12:59
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What is the performance cost of having a virtual method in a C++ class?
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I ran some timings on a 3ghz in-order PowerPC processor. On that architecture, a virtual function call costs 7 nanoseconds longer than a direct (non-virtual) function call.
So, not really worth worrying about the cost unless the function is something lik...
List comprehension vs map
...uages: you only get this benefit if you access your data left-to-right "in order", because python generator expressions can only be evaluated the order x[0], x[1], x[2], ....
However let's say that we have a pre-made function f we'd like to map, and we ignore the laziness of map by immediately forc...
Executing elements inserted with .innerHTML
...he src property will be downloaded asynchronously and executed as arrived. Ordering is not preserved. Inline scripts will also be executed out-of-order, synchronously before the async ones.
– robert4
Feb 11 '16 at 22:30
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Why does viewWillAppear not get called when an app comes back from the background?
...("will enter foreground")
}
}
On first starting the app, the output order is:
view did load
view will appear
did become active
view did appear
After pushing the home button and then bringing the app back to the foreground, the output order is:
will enter foreground
did become active
So...
How to write a Unit Test?
...it test for your project, please follow these steps (I am using Eclipse in order to write this test):
1- Click on New -> Java Project.
2- Write down your project name and click on finish.
3- Right click on your project. Then, click on New -> Class.
4- Write down your class name and c...
How do you detect/avoid Memory leaks in your (Unmanaged) code? [closed]
...n attacker can the several thousands required hours at reading the code in order to find a memory leak exploit. I would have expected an automated tool for source code analysis similar to what exist for JavaScript.
– user2284570
Oct 2 '15 at 13:50
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When should you not use virtual destructors?
...number of some object, it would be worth avoiding all virtual functions in order to save the additional 32 bits per object.
In all other cases, you will save yourself debug misery to make the dtor virtual.
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