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What is the advantage of GCC's __builtin_expect in if else statements?
...
I guess it should be something like:
cmp $x, 0
jne _foo
_bar:
call bar
...
jmp after_if
_foo:
call foo
...
after_if:
You can see that the instructions are arranged in such an order that the bar case precedes the foo case (as opposed to the C code). This can utilise the CPU ...
Asynchronous method call in Python?
I was wondering if there's any library for asynchronous method calls in Python . It would be great if you could do something like
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Difference Between Invoke and DynamicInvoke
...long hand to make it clear that an object[] is involved. There are lots of extra costs here:
the array
validating the passed arguments are a "fit" for the actual MethodInfo
unboxing etc as necessary
reflection-invoke
then the caller needs to do something to process the return value
Basically, av...
Bower and devDependencies vs dependencies
...install - consuming more (unnecessary) resources. From a purist POV, these extra bytes could be detrimental, just depends on your perspective.
To shed some light, looking at bower help install, modules listed under devDependencies can be omitted during the module installation via -p or --production...
Virtual member call in a constructor
...tual void DoSomething()
{
}
}
class Child : Parent
{
private string foo;
public Child()
{
foo = "HELLO";
}
protected override void DoSomething()
{
Console.WriteLine(foo.ToLower()); //NullReferenceException!?!
}
}
The answer is that in fact...
Background color of text in SVG
...hat does "SourceGraphic" mean here? Does "url(#solid)" actually cause an extra web access?
– Ben Slade
Nov 25 '15 at 19:28
7
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Does Python have an ordered set?
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I'm pretty sure you're not allowed to have two methods both called union in the same class. The last one will "win" and the first one will fail to exist at runtime. This is because OrderedSet.union (no parens) has to refer to a single object.
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Oracle “(+)” Operator
..."adding NULL values if no match found". For example, "a.id=b.id(+)" means allow b.id to be NULL if there is no match with a.id.
– beach
Oct 26 '10 at 5:00
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How to call Base Class's __init__ method from the child class? [duplicate]
... If you pass BaseClass to super, it'll skip over BaseClass and call object.__init__, which is almost certainly not what you want.
– abarnert
Oct 6 '13 at 7:29
1
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Combining C++ and C - how does #ifdef __cplusplus work?
...f legacy C code. We've started writing in C++, with the intent to eventually convert the legacy code, as well. I'm a little confused about how the C and C++ interact. I understand that by wrapping the C code with extern "C" the C++ compiler will not mangle the C code's names, but I'm no...