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How does one make an optional closure in swift?
...(), onReject: Optional<()->()>) { ` then you would not need the extra (), though IMO the ()? is prettier. Also you can make it even prettier with a typealias like typealias RejectHandler = () -> () func then(onFulfilled: ()->(), onReject: RejectHandler?) {
–...
Code equivalent to the 'let' keyword in chained LINQ extension method calls
...ueryable. In other words, if you change your first line to var names = new string [] { "Dog", ... }.AsQueryable(); then run the whole thing in LinqPad, click the little lambda button, you will see generated code virtually identical to Marc's answer.
– Reb.Cabin
...
Advantages of Antlr (versus say, lex/yacc/bison) [closed]
... debugging easy (e.g. you can see the generated AST's right in the GUI, no extra tools required)
Generated code is actually human-readable (it's one of the goals of ANTLR) and the fact that it generates LL parsers surely helps in this regard.
definition of terminals is context-free as well (as oppo...
SQLAlchemy - Getting a list of tables
...
All of the tables are collected in the tables attribute of the SQLAlchemy MetaData object. To get a list of the names of those tables:
>>> metadata.tables.keys()
['posts', 'comments', 'users']
If you're using the...
Pickle incompatibility of numpy arrays between Python 2 and 3
...
This seems like some sort of incompatibility. It's trying to load a "binstring" object, which is assumed to be ASCII, while in this case it is binary data. If this is a bug in the Python 3 unpickler, or a "misuse" of the pickler by numpy, I don't know.
Here is something of a workaround, but I d...
Using querySelectorAll to retrieve direct children
...support one code path that really just wants to take an arbitrary selector string as input and a list of matches as output! But if like me you ended up asking this question simply because you got stuck thinking "all you had was a hammer" don't forget there are a variety of other tools the DOM offers...
IllegalStateException: Can not perform this action after onSaveInstanceState with ViewPager
...
Please check my answer here. Basically I just had to :
@Override
protected void onSaveInstanceState(Bundle outState) {
//No call for super(). Bug on API Level > 11.
}
Don't make the call to super() on the saveInstanceState method. This was messing t...
iOS Detect 3G or WiFi
...der] carrierName];
if ([netinfo.currentRadioAccessTechnology isEqualToString:CTRadioAccessTechnologyGPRS]) {
NSLog(@"2G");
} else if ([netinfo.currentRadioAccessTechnology isEqualToString:CTRadioAccessTechnologyEdge]) {
NSLog(@"2G");
} else if ([netinfo.currentRadioAcces...
What is the fastest integer division supporting division by zero no matter what the result is?
...x, int y)
{
y += y == 0;
return x/y;
}
The compiler basically recognizes that it can use a condition flag of the test in the addition.
As per request the assembly:
.globl f
.type f, @function
f:
pushl %ebp
xorl %eax, %eax
movl %esp, %ebp
movl 12(%...
Is there a way to cache GitHub credentials for pushing commits?
...itched to synchronizing my repositories to https:// on GitHub (due to firewall issues), and it asks for a password every time.
...