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Finding the type of an object in C++
...
dynamic_cast should do the trick
TYPE& dynamic_cast<TYPE&> (object);
TYPE* dynamic_cast<TYPE*> (object);
The dynamic_cast keyword casts a datum from one pointer or reference type to another, performing a runtime...
std::unique_lock or std::lock_guard?
...
The difference is that you can lock and unlock a std::unique_lock. std::lock_guard will be locked only once on construction and unlocked on destruction.
So for use case B you definitely need a std::unique_lock for the condition variable. In case A it depends whether you need to relo...
How to set custom favicon in Express?
...ware and then do:
var favicon = require('serve-favicon');
app.use(favicon(__dirname + '/public/images/favicon.ico'));
Or better, using the path module:
app.use(favicon(path.join(__dirname,'public','images','favicon.ico')));
(note that this solution will work in express 3 apps as well)
In Express ...
Case objects vs Enumerations in Scala
...nswered Dec 14 '09 at 9:27
oxbow_lakesoxbow_lakes
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...
Get all attributes of an element using jQuery
...core
Also works for lodash.
function getAttributes ( node ) {
return _.reduce( node.attributes, function ( attrs, attribute ) {
attrs[attribute.name] = attribute.value;
return attrs;
}, {} );
}
lodash
Is even more concise than the Underscore version, but only works for l...
How to verify that method was NOT called in Moq?
...
Run a verify after the test which has a Times.Never enum set. e.g.
_mock.Object.DoSomething()
_mock.Verify(service => service.ShouldntBeCalled(), Times.Never);
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How do I get around type erasure on Scala? Or, why can't I get the type parameter of my collections?
...mport scala.reflect.Manifest
private var map= Map.empty[Any,(Manifest[_], Any)]
def register[T](name: Any, item: T)(implicit m: Manifest[T]) {
map = map.updated(name, m -> item)
}
def get[T](key:Any)(implicit m : Manifest[T]): Option[T] = {
map get key flatMap {
ca...
Insert, on duplicate update in PostgreSQL?
...FLICT clause. with the following syntax (similar to MySQL)
INSERT INTO the_table (id, column_1, column_2)
VALUES (1, 'A', 'X'), (2, 'B', 'Y'), (3, 'C', 'Z')
ON CONFLICT (id) DO UPDATE
SET column_1 = excluded.column_1,
column_2 = excluded.column_2;
Searching postgresql's email group a...
Object reference not set to an instance of an object.Why doesn't .NET show which object is `null`?
... should remember that it is not C# source that executes but rather IL:
IL_0001: ldnull
IL_0002: stloc.0 // s
IL_0003: ldloc.0 // s
IL_0004: callvirt System.String.get_Length
IL_0009: call System.Console.WriteLine
It is the callvirt opcode that throws the NullReferenc...
Passport.js - Error: failed to serialize user into session
...thods:
passport.serializeUser(function(user, done) {
done(null, user._id);
// if you use Model.id as your idAttribute maybe you'd want
// done(null, user.id);
});
passport.deserializeUser(function(id, done) {
User.findById(id, function(err, user) {
done(err, user);
});
});
I...