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How to filter array in subdocument with MongoDB [duplicate]
...eed to $unwind the list array before applying the $match so that you can filter individual elements and then use $group to put it back together:
db.test.aggregate([
{ $match: {_id: ObjectId("512e28984815cbfcb21646a7")}},
{ $unwind: '$list'},
{ $match: {'list.a': {$gt: 3}}},
{ $gr...
C# 多线程、并行处理全攻略（持续更新） - .NET(C#) - 清泛IT论坛，有思想、有深度
...xDegreeOfParallelism = 100;
object locker = new object();
Parallel.ForEach<string>(strList, parallelOption, str =>
{
lock (locker)
{
// Do something....
Compile error: “g++: error trying to exec 'cc1plus': execvp: No such file or directory”
...stalled.
g++ --version
gcc --version
If these don't give the result, you probably have multiple versions of gcc installed. You can check by using:
dpkg -l | grep gcc | awk '{print $2}'
Usually, /usr/bin/gcc will be sym-linked to /etc/alternatives/gcc which is again sym-linked to say...
How do I compile C++ with Clang?
...ad an linker error with clang -x c++ when compiled cpp file with #include <iostream>. -lstdc++ flag solved this problem.
– Slav
Oct 2 '15 at 16:17
...
How to search by key=>value in a multidimensional array in PHP
... any fast way to get all subarrays where a key value pair was found in a multidimensional array? I can't say how deep the array will be.
...
How to get base url with jquery or javascript?
...e url, href contains the query params as well
– dschulten
Jul 8 '17 at 12:27
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Maintaining the final state at end of a CSS3 animation
...eft:100px}
100% { transform:scale(1.0); opacity:1.0; left:200px}
}
<h1>The keyframes </h1>
<div></div>
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Quick Way to Implement Dictionary in C
... of HASHSIZE. For a complete discussion of the data structure, please consult the book.
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Difference between await and ContinueWith
...gine you're writing a WinForms app - if you write an async method, by default all of the code within the method will run in the UI thread, because the continuation will be scheduled there. If you don't specify where you want the continuation to run, I don't know what the default is but it could easi...
How do I push a local Git branch to master branch in the remote?
...
$ git push origin develop:master
or, more generally
$ git push <remote> <local branch name>:<remote branch to push into>
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