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Callback functions in C++
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A function pointer is the 'simplest' (in terms of generality; in terms of readability arguably the worst) type a callback can have.
Let's have a simple function foo:
int foo (int x) { return 2+x; }
1.1 Writing a function pointer / type notation
A function pointer type has the notation
return...
Ruby custom error classes: inheritance of the message attribute
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raise already sets the message so you don't have to pass it to the constructor:
class MyCustomError < StandardError
attr_reader :object
def initialize(object)
@object = object
end
end
begin
raise MyCustomError.new("...
google oauth2 redirect_uri with several parameters
...otect against CSRF, I'll try to show a proper method. Rather than passing (read exposing) data it should be kept local. Hydrate it before the request and re-hydrate it after a validated request. "Validated" here means that the state-nonce of request and response match.
You need some kind of temporar...
How to create REST URLs without verbs?
...se "RESTful URLs" is therefore nonsense.
I think you should do some more reading on what REST actually is. REST treats the URLS as opaque, and as such doesn't know what's in them, whether there are verbs or nouns or whatever. You might still want to design your URLs, but that's about UI, not REST....
What is a “context bound” in Scala?
...ept of 'is a'). A context bound (A : C) says 'has a' about a type. You can read the examples about manifests as "T has a Manifest". The example you linked to about Ordered vs Ordering illustrates the difference. A method
def example[T <% Ordered[T]](param: T)
says that the parameter can be see...
Why Large Object Heap and why do we care?
I have read about Generations and Large object heap. But I still fail to understand what is the significance (or benefit) of having Large object heap?
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Performance difference for control structures 'for' and 'foreach' in C#
... the difference to performance won't be significant, but the difference to readability favours the foreach loop.
I'd personally use LINQ to avoid the "if" too:
foreach (var item in list.Where(condition))
{
}
EDIT: For those of you who are claiming that iterating over a List<T> with foreach...
Is it good practice to make the constructor throw an exception? [duplicate]
..., and if the caller chooses to propagate the Exception, the problem just spreads.
1 - Some people may disagree, but IMO there is no substantive difference between this case and the case of throwing exceptions in methods. The standard checked vs unchecked advice applies equally to both cases.
2 ...
Is Java Regex Thread Safe?
...Pattern) class are immutable and are safe for use by multiple concurrent threads. Instances of the Matcher class are not safe for such use.
If you are looking at performance centric code, attempt to reset the Matcher instance using the reset() method, instead of creating new instances. This would ...
What is the logic behind the “using” keyword in C++?
...r<T> > Vec;
That notation has the advantage of using a keyword already known to
introduce a type alias. However, it also displays several
disavantages among which the confusion of using a keyword known to
introduce an alias for a type-name in a context where the alias does
not designate a ...