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What is the “volatile” keyword used for?
...latestness" - inherently fake since a lock just force cores to arbitrarily select one speaker at a time w/o fairness - but rather try to design away the need for such an unnatural concept.
– AnorZaken
May 5 at 15:57
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How to get all subsets of a set? (powerset)
... = [a for a in A]
ps = set()
for i in range(2 ** length):
selector = f'{i:0{length}b}'
subset = {l[j] for j, bit in enumerate(selector) if bit == '1'}
ps.add(frozenset(subset))
return ps
If you want exactly the output you posted in your answer use this:
>&...
Center a map in d3 given a geoJSON object
...ction
In code:
var width = 300;
var height = 400;
var vis = d3.select("#vis").append("svg")
.attr("width", width).attr("height", height)
d3.json("nld.json", function(json) {
// create a first guess for the projection
var center = d3.geo.centroid(json)
var scale...
Threading in a PyQt application: Use Qt threads or Python threads?
...have you considered non-blocking I/O using Twisted or non-blocking sockets/select?
EDIT: more on threads
Python threads
Python's threads are system threads. However, Python uses a global interpreter lock (GIL) to ensure that the interpreter is only ever executing a certain size block of byte-code...
浅谈APM在电子交易系统中的应用 - 更多技术 - 清泛网 - 专注C/C++及内核技术
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慢的原因是因为执行了两条 Database dt_manager_log-select 语句。还有更详细的的，看看是怎么调用的
清晰的看到具体的语句，是怎么调用， 很明显这就是一个查询语句而查询的速度这么慢肯定是不正常的
接...
Which .NET Dependency Injection frameworks are worth looking into? [closed]
...nd evaluating and seeing which one fits. The nice thing is you have a nice selection of donuts rather than just having to have a jelly one.
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foll...
Java Reflection Performance
...Richard Riley Generally class instantiation is a pretty rare event for the selected classes you will use reflection on. I suppose you are right though--some people might instantiate every class reflectively, even ones that are recreated constantly. I would call that pretty bad programming (althoug...
How do I tell git-svn about a remote branch created after I fetched the repo?
... step 2> -- there should be no output. If there is output, you may have selected the wrong commits.
git checkout local-newbranch then git rebase <sha1 from step 1>. This will rebase local-newbranch onto the new tree but remotes/newbranch will still be disconnected.
Go to the file .git/refs...
Comparing object properties in c# [closed]
...e && (selfValue == null || !selfValue.Equals(toValue))
select selfValue;
return !unequalProperties.Any();
}
return self == to;
}
public static class TypeExtensions
{
/// <summary>
/// Determine whether a type is simple (String, Decimal, DateT...
What is a lambda (function)?
...tual SQL to execute using expression trees.
The statement above becomes:
select ... from [tablename]
where [FieldName] > 15 --this line was 'read' from the lambda function
This is different from normal methods or anonymous delegates (which are just compiler magic really) because they ca...