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How fast is D compared to C++?
...s");
return 0;
}
I compiled each of these tests using an LLVM-based compiler, since LDC seems to be the best option for D compilation in terms of performance. On my x86_64 Arch Linux installation I used the following packages:
clang 3.6.0-3
ldc 1:0.15.1-4
dtools 2.067.0-2
I used the...
C++ new int[0] — will it allocate memory?
...C++ isn't so strong with forbidding zero sized objects. Think of the empty base class optimization: Here too, an empty base class sub-object may have size zero. In contrast, the C Standard makes a strong effort to ensure there never are zero sized objects created: In defining malloc(0) it says the e...
Java Delegates?
...
Have you read this :
Delegates are a useful construct in event-based systems. Essentially
Delegates are objects that encode a method dispatch on a specified
object. This document shows how java inner classes provide a more
generic solution to such problems.
What is a Delegate?...
How to round up to the nearest 10 (or 100 or X)?
...nice" number is. The following lets us define "nice" as a vector with nice base values from 1 to 10. The default is set to the even numbers plus 5.
roundUpNice <- function(x, nice=c(1,2,4,5,6,8,10)) {
if(length(x) != 1) stop("'x' must be of length 1")
10^floor(log10(x)) * nice[[which(x &...
How to disable margin-collapsing?
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Every webkit based browser should support the properties -webkit-margin-collapse. There are also subproperties to only set it for the top or bottom margin. You can give it the values collapse (default), discard (sets margin to 0 if there ...
Javascript when to use prototypes
...So in those situations where (in C# or Java) you would have derived from a base class to gain default behaviour, which you then make small modifications to via overrides, then in JavaScript, prototypical inheritance makes sense.
However, if you're in a situation where you would have used interfaces...
What is the proper REST response code for a valid request but an empty data?
...ost uses of API endpoints in our universe of smart devices are not browser based and those that are likely use AJAX. Sorry to take points away though.
– Matt Cashatt
Sep 16 '16 at 16:13
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How do I safely pass objects, especially STL objects, to and from a DLL?
...L, then examine the produced .def file (if one is produced; this will vary based on your project options) or use a tool like Dependency Walker to find the mangled name. Then, you'll need to write your own .def file, defining an unmangled alias to the mangled function. As an example, let's use the Ge...
Algorithm to find Largest prime factor of a number
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My answer is based on Triptych's, but improves a lot on it. It is based on the fact that beyond 2 and 3, all the prime numbers are of the form 6n-1 or 6n+1.
var largestPrimeFactor;
if(n mod 2 == 0)
{
largestPrimeFactor = 2;
n = ...
Tar a directory, but don't store full absolute paths in the archive
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how about if you also want to select the files to backup based on a wildcard? -C /var/www/site1 *.dat doesn't work :(
– Andy Lorenz
Nov 5 '14 at 10:30
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