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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 ...
What is the difference between loose coupling and tight coupling in the object oriented paradigm?
...s when a class assumes too many responsibilities, or when one concern is spread over many classes rather than having its own class.
Loose coupling is achieved by means of a design that promotes single-responsibility and separation of concerns.
A loosely-coupled class can be consumed and tested ind...
When and why will a compiler initialise memory to 0xCD, 0xDD, etc. on malloc/free/new/delete?
... of `std::string` or the user buffer
passed to `fread()`). 0xFD is used in VS 2005 (maybe
some prior versions, too), 0xFE is used in VS 2008
and later.
0xCC When the code is compiled with the /GZ optio...
Perform debounce in React.js
...;/div>
);
};
You will find this example running here and you should read react-async-hook documentation for more details.
2018: try promise debouncing
We often want to debounce API calls to avoid flooding the backend with useless requests.
In 2018, working with callbacks (Lodash/Undersco...
How to create the most compact mapping n → isprime(n) up to a limit N?
...
True, but there are better storage methods than reading from a file in a linear fashion. If you really want to read from a stored set of pre-generated primes, try a more complicated data structure that speeds up the problem.
– CogitoErgoCogitoSum
...
OpenCV C++/Obj-C: Detecting a sheet of paper / Square Detection
... don't supported the GPU module of OpenCV. Have you built OpenCV for iOS already? Were you able to test it? I think these are the questions you need to answer before trying anything more advanced. Baby steps!
– karlphillip
Jan 25 '12 at 12:40
...
To ARC or not to ARC? What are the pros and cons? [closed]
...RC also != just auto releasing everything, as you suggest in your comment. Read the docs
It's awesome once you realise how much manual reference management you were doing
Use it!
One drawback - maintaining old, non-arc code suddenly becomes very tedious.
...
Can dplyr package be used for conditional mutating?
...s it can evaluate both 'yes' and 'no' cases, and nesting can get harder to read/maintain IMHO.
Here's a benchmark on relatively bigger data:
# R version 3.1.0
require(data.table) ## 1.9.2
require(dplyr)
DT <- setDT(lapply(1:6, function(x) sample(7, 1e7, TRUE)))
setnames(DT, letters[1:6])
# &...