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What are some compelling use cases for dependent method types?
...b: M) = 0;class CI extends C{type A=Int};class CS extends C{type A=String} etc.
– nafg
Oct 7 '13 at 23:26
...
Nearest neighbors in high-dimensional data?
...a set of test instances (to calculate predicted values) for n=1, n=2, n=3, etc. and plot the error as a function of n. If you just want a plausible value for n to get started, again, just use n = 3.
The second component is how to weight the contribution of each of the neighbors (assuming n > 1)....
What is pseudopolynomial time? How does it differ from polynomial time?
...gorithm.
When working with algorithms that process graphs, lists, trees, etc., this definition more or less agrees with the conventional definition. For example, suppose you have a sorting algorithm that sorts arrays of 32-bit integers. If you use something like selection sort to do this, the runt...
Is non-blocking I/O really faster than multi-threaded blocking I/O? How?
...rrent connections if the scarce resource is a connection-limited database, etc.).
Another way to put it is: allowing the operating system to interleave the usage of a single resource for two tasks cannot be faster than merely letting one task use the resource while the other waits, then letting the...
How to “properly” create a custom object in JavaScript?
...n larger code bases as developers forget to use new, forget to capitalize, etc. To be pragmatic, you can do everything you need to do without the new keyword - so why use it and introduce more points of failure in the code? JS is a prototypal, not class based, language. So why do we want it to act l...
std::function vs template
... of the calculations of calc1 and calc2 are not the same, due to in-lining etc. Compare for example the sum of all results:
float result=0;
for (int i = 0; i < 1e8; ++i) {
result+=calc2([](float arg){ return arg * 0.5f; });
}
with calc2 that becomes
1.71799e+10, time spent 0.14 sec
while...
How well is Unicode supported in C++11?
...wish for Unicode functionality (number of code points, number of graphemes etc) you are out of luck.
The only comprehensive library I know of for this is ICU. The C++ interface was derived from the Java one though, so it's far from being idiomatic.
...
What is the purpose of setting a key in data.table?
...along with associated information (city, state, population, median income, etc.). If I want to look up the information for a specific zip code, the search (filter) is about 1000 times faster if I setkey(ZIP,zipcode) first.
Another benefit has to do with joins. Suppose a have a list of people and th...
Best explanation for languages without null
...azy null value that is meaningless to the graphing domain I'm working in. Etc.
When you do intend to model a possibly-non-existent value, then you should opt into it explicitly. If the way I intend to model people is that every Person has a FirstName and a LastName, but only some people have Midd...
WebSockets protocol vs HTTP
...ng in real-time, chat, multiplayer games, live online collaboration tools, etc.
You can check out a deep dive article on Websockets which explains the history of this protocol, how it came into being, what it’s used for and how you can implement it yourself.
Here's a video from a presentation I ...