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Pure virtual function with implementation
...icitly call the base class implementation (if access permissions allow it) by using a fully-scoped name (by calling A::f() in your example - if A::f() were public or protected). Something like:
class B : public A {
virtual void f() {
// class B doesn't have anything special to do for ...
Maintain aspect ratio of div but fill screen width and height in CSS?
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}
This is very similar in vein to the max-width and max-height approach by @Danield, just more flexible.
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Always pass weak reference of self into block in ARC?
...ect will be deallocated properly.
Because, in a situation like this, self by definition already has a strong reference to the block, it's usually easiest to resolve by making an explicitly weak reference to self for the block to use:
__weak MyObject *weakSelf = self;
[self setMyBlock:^(id obj, NSU...
Convert numpy array to tuple
...ost as common as the non-exceptional state. At least in c++, flow control by exceptions is usually frowned upon. Would it be better to test if type(a)==numpy.ndarray?
– Mike
Apr 5 '12 at 15:36
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SecurityException: Permission denied (missing INTERNET permission?)
...ile or, as internet permission is granted at installation not at run time, by long standing, missed bug in Android framework that causes your app to be successfully installed, but without expected permission grant.
My Manifest is correct, so how can this happen?
Theoretically, presence of uses-per...
Does using “new” on a struct allocate it on the heap or stack?
...he stack". It's more complicated than that (and made even more complicated by C# 2). I have an article on the topic and will expand on it if requested, but let's deal with just the new operator.
Secondly, all of this really depends on what level you're talking about. I'm looking at what the compile...
How to define Gradle's home in IDEA?
...w use export GRADLE_HOME="$(brew --prefix gradle)/libexec/" as recommended by @delitescene. Compare ls "$(brew --prefix gradle)/libexec/" with ls "$(which gradle)/libexec/" on osx, if u r using brew.
– mlo55
Nov 19 '18 at 6:35
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What does “Mass Assignment” mean in Laravel?
...lly setting a bunch of fields on the model in a single go, rather than one by one, something like:
$user = new User(request()->all());
(This is instead of explicitly setting each value on the model separately.)
You can use fillable to protect which fields you want this to actually allow for ...
What's the difference between emulation and simulation? [duplicate]
...he same answers, that probe is an emulator. Better answers are given below by Jay Elston, coxy, and semiuseless.
– Jim Tshr
Sep 26 '11 at 17:53
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What is the X-REQUEST-ID http header?
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When you're operating a webservice that is accessed by clients, it might be difficult to correlate requests (that a client can see) with server logs (that the server can see).
The idea of the X-Request-ID is that a client can create some random ID and pass it to the server. T...