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What breaking changes are introduced in C++11?
...nity, whereas C++0x always rounds the result toward 0.
(admittedly not really a compatibility problem for most people).
Valid C++ 2003 code that uses the keyword auto as a storage class specifier may be invalid in C++0x.
Narrowing conversions cause incompatibilities with C++03. For ex...
Why does Ruby have both private and protected methods?
... a class it is declared in as well as all subclasses of this class.
class Test1
def main_method
method_private
end
private
def method_private
puts "Inside methodPrivate for #{self.class}"
end
end
class Test2 < Test1
def main_method
method_private
end
end
Test1.new.ma...
How do I implement a callback in PHP?
How are callbacks written in PHP?
9 Answers
9
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Named routes _path vs _url
...
_path helpers provide a site-root-relative path. You should probably use this most of the time.
_url helpers provide an absolute path, including protocol and server name. I've found that I mainly use these in emails when cre...
Date vs DateTime
...
Unfortunately, not in the .Net BCL. Dates are usually represented as a DateTime object with the time set to midnight.
As you can guess, this means that you have all the attendant timezone issues around it, even though for a Date object you'd want absolutely no timezone han...
Dictionary returning a default value if the key does not exist [duplicate]
...Value(key, out value);
and just ignore the return value. However, that really will just return default(TValue), not some custom default value (nor, more usefully, the result of executing a delegate). There's nothing more powerful built into the framework. I would suggest two extension methods:
pu...
Why would iterating over a List be faster than indexing through it?
...teration type should be used (indexed vs Iterator/foreach), you can always test if a List implements RandomAccess (a marker interface): List l = unknownList(); if (l instanceof RandomAccess) /* do indexed loop */ else /* use iterator/foreach */
– afk5min
Ma...
C# Lazy Loaded Automatic Properties
... 4.0 Lazy<T> type to create this pattern
private Lazy<string> _someVariable =new Lazy<string>(SomeClass.IOnlyWantToCallYouOnce);
public string SomeVariable => _someVariable.Value;
This code will lazily calculate the value of _someVariable the first time the Value expression i...
How do I get my Maven Integration tests to run
...a maven2 multi-module project and in each of my child modules I have JUnit tests that are named Test.java and Integration.java for unit tests and integration tests respectively. When I execute:
...
Get the _id of inserted document in Mongo database in NodeJS
...ection.insert that will return the doc or docs inserted, which should have _ids.
Try:
collection.insert(objectToInsert, function(err,docsInserted){
console.log(docsInserted);
});
and check the console to see what I mean.
...