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Why is Scala's immutable Set not covariant in its type?
...y(e: A): Boolean
}
If Set were covariant in A, the apply method would be unable to take a parameter of type A due to the contravariance of functions. Set could potentially be contravariant in A, but this too causes issues when you want to do things like this:
def elements: Iterable[A]
In short...
How to get all child inputs of a div element (jQuery)
...e loop I am accessing the current element using $(this). As a result, I am unable to perform a lot of what is otherwise suggested in the answers. - Instead I am able to do $(this).find("input"); Thanks.
– djbp
May 23 '13 at 11:08
...
Socket send函数和recv函数详解以及利用select()函数来进行指定时间的阻塞 ...
...onnect函数发出一个连接请求后，调用者线程立刻可以朝下运行。当连接真正建立起来以后，socket底层会发送一个消息通知该对象。这里提到执行 部件和调用者通过三种途径返回结果：状态、通知和回调。可以使用哪一种依赖于...
Routing: The current request for action […] is ambiguous between the following action methods
...me tag, since I think that only works to rename all of the action methods (unable to keep both at the same time). It's good to know how MVC works. Thanks.
– Dave
May 20 '12 at 5:39
...
How to disable GCC warnings for a few lines of code
...
It appears this can be done. I'm unable to determine the version of GCC that it was added, but it was sometime before June 2010.
Here's an example:
#pragma GCC diagnostic error "-Wuninitialized"
foo(a); /* error is given for this one */
#pragma...
Fling gesture detection on grid layout
...
I tried this code and it did not work. still was unable to scroll at all when i apply a onClick listener to one of the child views inside my gallery view
– Jonathan
Jul 26 '11 at 14:23
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How to check if running in Cygwin, Mac or Linux?
...uire launching a new process, so will be quicker to execute.
However, I'm unable to find an authoritative list of expected values. For me on Ubuntu 14.04 it is set to 'linux-gnu'. I've scraped the web for some other values. Hence:
case "$OSTYPE" in
linux*) echo "Linux / WSL" ;;
darwin*) ech...
What are the differences between “generic” types in C++ and Java?
...basically a glorified preprocessor/macro set (Note: since some people seem unable to comprehend an analogy, I'm not saying template processing is a macro). In Java they are basically syntactic sugar to minimize boilerplate casting of Objects. Here is a pretty decent introduction to C++ templates v...
Accessing an array out of bounds gives no error, why?
...on main)
array.c:5:9: Likely out-of-bounds
store:
array[1]
Unable to resolve constraint:
requires 0 >= 1
needed to satisfy precondition:
requires maxSet(array @ array.c:5:9) >= 1 A memory write may
write to an address beyond the
allocated buffer.
...
Responsive iframe using Bootstrap
...
unable decrease height of iframe. I changed from 100% to 80% class .embed-responsive iframe. But is giving empty space. after the video. How to avoid this space.
– SatyaTNV
Aug 26 '15 at...