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What are transparent comparators?
...e the new functionality should be enabled in associative containers. Technically, the containers don't need a "transparent functor", just one that supports calling it with heterogeneous types (e.g. the pointer_comp type in https://stackoverflow.com/a/18940595/981959 is not transparent according to S...
Class does not implement its superclass's required members
...coder: NSCoder) {
self.init(stringParam: "", intParam: 5)
}
Note the call to an initializer in self. This allows you to only have to use dummy values for the parameters, as opposed to all non-optional properties, while avoiding throwing a fatal error.
The third option of course is to implem...
C++ - passing references to std::shared_ptr or boost::shared_ptr
...?
It all depends what is in those '...' sections of the code. What if you call something during the first '...' that has the side-effect (somewhere in another part of the code) of clearing a shared_ptr to that same object? And what if it happens to be the only remaining distinct shared_ptr to that ...
Efficient string concatenation in C++
...ould eliminate some return value copies. That is because in a successively called operator+ it does not know whether the reference parameter references a named object or a temporary returned from a sub operator+ invocation. I would rather not worry about it before not having profiled first. But let'...
Why is reading lines from stdin much slower in C++ than Python?
...
tl;dr: Because of different default settings in C++ requiring more system calls.
By default, cin is synchronized with stdio, which causes it to avoid any input buffering. If you add this to the top of your main, you should see much better performance:
std::ios_base::sync_with_stdio(false);
Normal...
Is using a lot of static methods a bad thing?
...ve the same output for the same inputs. It modifies no globals and doesn't call any "unsafe" static methods of any class. Essentially, you are using a limited sort of functional programming -- don't be afraid of these, they're fine.
An "unsafe" static method mutates global state, or proxies to a glo...
Embed YouTube video - Refused to display in a frame because it set 'X-Frame-Options' to 'SAMEORIGIN'
...sure the URL contains embed rather watch as the /embed endpoint allows outside requests, whereas the /watch endpoint does not.
<iframe width="420" height="315" src="https://www.youtube.com/embed/A6XUVjK9W4o" frameborder="0" allowfullscreen></iframe>
...
Do spurious wakeups in Java actually happen?
...thread_cond_wait() function in Linux is implemented using the futex system call. Each blocking system call on Linux returns abruptly with EINTR when the process receives a signal. ... pthread_cond_wait() can't restart the waiting because it may miss a real wakeup in the little time it was outside th...
Determine version of Entity Framework I am using?
...ework and list the version the project has installed.
PM> Get-Package
Id Version Description/Release Notes ...
Fastest way to get the first object from a queryset in django?
...want to first turn it into a list because that would force a full database call of all the records. Just do the above and it will only pull the first. You could even use .order_by() to ensure you get the first you want.
Be sure to add the .get() or else you will get a QuerySet back and not an object...