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What is the difference between a weak reference and an unowned reference?
...the instance that it references is deallocated, you will trigger a runtime error, and the app will crash.
That's the only risk I see with it.
Link to Apple Docs
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What happens to global and static variables in a shared library when it is dynamically linked?
...al variables defined in other modules. This means that you will get linker errors if you try, for example, to create an executable that is supposed to use an extern variable defined in a DLL, because this is not allowed. You would need to provide an object file (or static library) with a definition ...
Why is SELECT * considered harmful?
...rt in the long run.
If code depends on column order, SELECT * will hide an error waiting to happen if a table had its column order changed.
Even if you need every column at the time the query is written, that might not be the case in the future
the usage complicates profiling
Design
SELECT * is ...
Virtual/pure virtual explained
...mplementation to pure virtual method in base class. Hence case #4 is still error.
– prasad
Apr 10 '17 at 16:21
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nginx upload client_max_body_size issue
...h seemed to be the better one and I tried it. But I'm still getting a 413 error after about 20 seconds for a 4mb file. My upspeeds cannot manage 4 MB in 20secs so it is happening after data has been flowing for quite a bit. Thoughts?
– Jerome
Oct 19 '14 at 1...
phpunit mock method multiple calls with different arguments
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FYI, I was using PHPUnit 4.0.20 and receiving error Fatal error: Call to undefined method PHPUnit_Framework_MockObject_Builder_InvocationMocker::withConsecutive(), upgraded to 4.1 in a snap with Composer and it's working.
– quickshiftin
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What exactly is Type Coercion in Javascript?
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In Python if you try to add, say, strings and integers, you get an error:
>>> "hi" + 10
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: cannot concatenate 'str' and 'int' objects
Yet in JavaScript, you don't. The 10 gets converted t...
How to create a generic array in Java?
... of implementing a generic collection in Effective Java; Item 26. No type errors, no need to cast the array repeatedly. However this triggers a warning because it is potentially dangerous, and should be used with caution. As detailed in the comments, this Object[] is now masquerading as our E[] t...
Immutable vs Mutable types
...ing that is immutable. You can not change its content. It will raise a TypeError if you try to change it. Also, if we assign new content, a new object is created instead of the contents being modified.
>>> s = "abc"
>>>id(s)
4702124
>>> s[0]
'a'
>>> s[0] = "o"
T...
What is the closest thing Windows has to fork()?
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Note that most of the error checking is missing - e.g. ZwCreateThread returns an NTSTATUS value which can be checked using the SUCCEEDED and FAILED macros.
– BCran
Oct 11 '13 at 9:27
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