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Rails 3.1: Engine vs. Mountable App
...s terminology confusion: Unfortunately rails plugin -h shows the following descriptions:
[--full] # Generate a rails engine with bundled Rails application for testing
[--mountable] # Generate mountable isolated application
This gives the impression that you use --full to create an "engine" and --m...
Open new Terminal Tab from command line (Mac OS X)
... cat <<EOF
Synopsis:
$funcName [-g|-G] [command [param1 ...]]
Description:
Opens a $targetDesc and optionally executes a command.
The new $targetType will run a login shell (i.e., load the user's shell profile) and inherit
the working folder from this shell (the active Term...
What is std::promise?
... type std::future_error, which derives from std::logic_error. First off, a description of some constraints:
A default-constructed promise is inactive. Inactive promises can die without consequence.
A promise becomes active when a future is obtained via get_future(). However, only one future may be...
Are Exceptions in C++ really slow
...y takes a long time
Determining the right handler involves RTTI: many RTTI descriptors to fetch, scattered around memory, and complex operations to run (basically a dynamic_cast test for each handler)
So, mostly cache misses, and thus not trivial compared to pure CPU code.
Note: for more details,...
What is the canonical way to check for errors using the CUDA runtime API?
...
This will incorporate the filename, line number, and an English language description of the cudaError_t into the thrown exception's .what() member:
#include <iostream>
int main()
{
try
{
// do something crazy
throw_on_cuda_error(cudaSetDevice(-1), __FILE__, __LINE__);
}
cat...
Algorithm to generate a crossword
...
Nice description. I thought about this a few times in the past, but never tried it. Now for the magic question: how well did it work? Just for sparse puzzles, or also for dense ones (like in the paper)? And how many clues do you n...
@property retain, assign, copy, nonatomic in Objective-C
...
Variable property attributes or Modifiers in iOS
Here is the Sample Description from Article
atomic
-Atomic means only one thread access the variable(static type).
-Atomic is thread safe.
-but it is slow in performance
-atomic is default behavior
-Atomic accessors in a non garbage collecte...
O(nlogn) Algorithm - Find three evenly spaced ones within binary string
...wever, there is a simple linear-time reduction from AVERAGE to 3SUM, whose description we omit.
Wikipedia:
When the integers are in the range [−u ... u], 3SUM can be solved in time O(n + u lg u) by representing S as a bit vector and performing a convolution using FFT.
This is enough to sol...
JavaScript hashmap equivalent
...
Problem description
JavaScript has no built-in general map type (sometimes called associative array or dictionary) which allows to access arbitrary values by arbitrary keys. JavaScript's fundamental data structure is the object, a sp...
“Single-page” JS websites and SEO
...lt;h1><%= @article.title %></h1>
<p><%= @article.description %></p>
<p><%= @article.content %></p>
</div>
And then using JavaScript, which doesn't get run when a JavaScript-disabled device opens the page:
$("#no-js").remove() # jQuery
...