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How do I declare an array of weak references in Swift?
...T] {
return objects.flatMap { $0.object }
}
func contains(_ object: T) -> Bool {
return self.objects.contains(WeakObject(object: object))
}
func addObject(_ object: T) {
self.objects.formUnion([WeakObject(object: object)])
}
func addObjects(_ obj...
使用TokuMX配置Replica Set集群 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...e，可加参数指定ip、端口，默认本机27017）
config={
"_id" : "ReplSetName",
"members" : [
{"_id" : 0, "host" : "172.16.88.97:27017",priority:2},
{"_id" : 1, "host" : "172.16.88.97:27018",priority:1},
{"_id" : 2, "host" : "172.16.88.97:27019",arbit...
New self vs. new static
...the first method, whereas static is bound to the called class (also see get_called_class()).
class A {
public static function get_self() {
return new self();
}
public static function get_static() {
return new static();
}
}
class B extends A {}
echo get_class(B::ge...
UILabel sizeToFit doesn't work with autolayout ios6
...s = [NSLayoutConstraint constraintsWithVisualFormat:@"|-8-[descriptionLabel_]-8-|" options:0 metrics:nil views:NSDictionaryOfVariableBindings(descriptionLabel_)];
[self addConstraints:constrs];
[self addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|-8-[descriptionLabel_]" options:...
Scala @ operator
...n itself? That would be accomplished with this:
o match {
case x @ Some(_) => println(x)
case None =>
}
Note that @ can be used at any level, not just at the top level of the matching.
share
|
...
Find MongoDB records where array field is not empty
...unexpected results. For example: db.doc.find({'nums': { $gt: [] }}).hint({ _id: 1 }).count() returns the right number, while db.doc.find({'nums': { $gt: [] }}).hint({ nums: 1 }).count() returns 0.
– wojcikstefan
Mar 4 '17 at 17:51
...
How to change a table name using an SQL query?
...
Use sp_rename:
EXEC sp_rename 'Stu_Table', 'Stu_Table_10'
You can find documentation on this procedure on MSDN.
If you need to include a schema name, this can only be included in the first parameter (that is, this cannot be use...
awk without printing newline
...
awk '{sum+=$3}; END {printf "%f",sum/NR}' ${file}_${f}_v1.xls >> to-plot-p.xls
print will insert a newline by default. You dont want that to happen, hence use printf instead.
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How to sort with a lambda?
...nclude <iostream>
#include <sstream>
struct Foo
{
Foo() : _i(0) {};
int _i;
friend std::ostream& operator<<(std::ostream& os, const Foo& f)
{
os << f._i;
return os;
};
};
typedef std::vector<Foo> VectorT;
std::string ...
React.js: onChange event for contentEditable
...tChange}
contentEditable
dangerouslySetInnerHTML={{__html: this.props.html}}></div>;
},
shouldComponentUpdate: function(nextProps){
return nextProps.html !== this.getDOMNode().innerHTML;
},
emitChange: function(){
var html = this.getDO...