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What is a lambda expression in C++11?
...t is not an anonymous function, but capture-less lambdas can be implicitly converted to a function pointer.
p.s.
More about lambda grammar information can be found in Working draft for Programming Language C++ #337, 2012-01-16, 5.1.2. Lambda Expressions, p.88
In C++14 the extra feature which has...
Multiple INSERT statements vs. single INSERT with multiple VALUES
...
I ran into a similar situation trying to convert a table with several 100k rows with a C++ program (MFC/ODBC).
Since this operation took a very long time, I figured bundling multiple inserts into one (up to 1000 due to MSSQL limitations). My guess that a lot of sin...
Build fat static library (device + simulator) using Xcode and SDK 4+
...ary takes much more effort to setup, but much nicer long-term solution (it converts your library into a Framework).
Use this, then tweak it to add support for Archive builds - c.f. @Frederik's comment below on the changes he's using to make this work nicely with Archive mode.
RECENT CHANGES:
1. ...
Optional Parameters with C++ Macros
...
You could get a clear compilation error if you converted the selected argument which is supposed to be a MACRO name to string using # (the pound sign) and compared it's first n characters with the expected prefix and if there is no match, printed an informative error.
...
What is the difference between “INNER JOIN” and “OUTER JOIN”?
... by the outer join ends up discarded (along with the blue one) effectively converting the join back to an inner one.
If the intention was to include only rows from B where Colour is Green and all rows from A regardless the correct syntax would be
SELECT A.Colour, B.Colour FROM A LEFT OUTER JOIN B O...
Extracting text OpenCV
...
Here is an alternative approach that I used to detect the text blocks:
Converted the image to grayscale
Applied threshold (simple binary threshold, with a handpicked value of 150 as the threshold value)
Applied dilation to thicken lines in image, leading to more compact objects and less white sp...
What's the fastest way to merge/join data.frames in R?
...he plyr timings here. Also note that the data.table do include the time to convert to data.table and set the key, for fareness.
This answer has been updated since originally answered in Dec 2010. The previous benchmark results are below. Please see revision history of this answer to see what chan...
Comparing Haskell's Snap and Yesod web frameworks
...hat they'd standardise on either ByteStrings or Text as you are constantly converting between them !
– Andrew
Jan 25 '12 at 22:23
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show 2 m...
ServiceStack vs ASP.Net Web API [closed]
...t (IHttpResult) for Customized HTTP response
The following types are not converted and get written directly to the Response Stream:
String
Stream
IStreamWriter
byte[] - with the application/octet-stream Content Type.
An example of the Custom HTTP headers support can be seen by this CORS exampl...
What is “entropy and information gain”?
...-1)/2) = prob_array(diff+(array_size-1)/2) + 1
endif
endfor
//Convert values in prob_array to probabilities and compute entropy
n = total(prob_array)
entrop = 0
for i = 0, array_size-1 do begin
prob_array(i) = prob_array(i)/n
//Base 2 log of x is Ln(x)/Ln(2). Take Ln of array ...