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Does C++ support 'finally' blocks? (And what's this 'RAII' I keep hearing about?)
... to manually manage its member resource lifetimes. (Thanks to Mike B for pointing this out.)
For those familliar with C# or VB.NET, you may recognize that RAII is similar to .NET deterministic destruction using IDisposable and 'using' statements. Indeed, the two methods are very similar. The main...
When should I use C++14 automatic return type deduction?
...sually implicit but we can make them explicit with casts". C++11 and C++1y introduce type deduction tools so that you can leave out the type in new places.
Sorry, but you're not going to solve this up front by making general rules. You need to look at particular code, and decide for yourself whethe...
Conventions for exceptions or error codes
...
Your fourth point is not a fair one: An error status when converted into an object, can also contain code to check whether the file exists, or is locked, etc. It's simply a variation of stackoverflow.com/a/3157182/632951
– Pacerier
Jul 25 '14 a...
Can I zip more than two lists together in Scala?
...
Thanks, that works perfectly! As I go into my specific use case, I see that a list of lists would be better anyway, as I need to map and reduce the various sub-lists.
– pr1001
Nov 3 '09 at 1:38
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Big O, how do you calculate/approximate it?
...e size.
The purpose is simple: to compare algorithms from a theoretical point of view, without the need to execute the code. The lesser the number of steps, the faster the algorithm.
For example, let's say you have this piece of code:
int sum(int* data, int N) {
int result = 0; ...
How to use QueryPerformanceCounter?
...
#include <windows.h>
double PCFreq = 0.0;
__int64 CounterStart = 0;
void StartCounter()
{
LARGE_INTEGER li;
if(!QueryPerformanceFrequency(&li))
cout << "QueryPerformanceFrequency failed!\n";
PCFreq = double(li.QuadPart)/1000.0;
QueryPer...
Meaning of acronym SSO in the context of std::string
...mall String Optimization. A std::string typically stores the string as a pointer to the free store ("the heap"), which gives similar performance characteristics as if you were to call new char [size]. This prevents a stack overflow for very large strings, but it can be slower, especially with copy o...
Learning to write a compiler [closed]
...lf and a bottom-one. The top-half generally takes the source language and converts it into an intermediate representation, and the bottom half takes care of the platform specific code generation.
Nonetheless, one idea for an easy way to approach this topic (the one we used in my compilers class, a...
Which method performs better: .Any() vs .Count() > 0?
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Doesn't Any() implementation check for ICollection interface and check after for Count property?
– derigel
Sep 29 '09 at 8:35
317
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Are there any SHA-256 javascript implementations that are generally considered trustworthy?
...nst hashBuffer = await crypto.subtle.digest('SHA-256', msgBuffer);
// convert ArrayBuffer to Array
const hashArray = Array.from(new Uint8Array(hashBuffer));
// convert bytes to hex string
const hashHex = hashArray.map(b => ('00' + b.toString(16)).slice(-2)).joi...