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sqlalchemy: how to join several tables by one query?
...can receive multiple criteria if comma separated. Is it preferable to use one .filter() with comma separations inside the parenthesis, or use multiple .filter() like the above answer?
– Intrastellar Explorer
Apr 18 '19 at 22:27
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How to implement classic sorting algorithms in modern C++?
... as with std::next() are only available as of C++11 and beyond. For C++98, one needs to write these himself. There are substitutes from Boost.Range in boost::begin() / boost::end(), and from Boost.Utility in boost::next().
the std::is_sorted algorithm is only available for C++11 and beyond. For C++...
Should I return a Collection or a Stream?
...ore useful to your callers.
If your result might be infinite, there's only one choice: Stream.
If your result might be very large, you probably prefer Stream, since there may not be any value in materializing it all at once, and doing so could create significant heap pressure.
If all the caller is g...
Design Pattern for Undo Engine
...ting a structural modeling tool for a civil enginering application. I have one huge model class representing the entire building, which include collections of nodes, line elements, loads, etc. which are also custom classes.
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What are the differences in die() and exit() in PHP?
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aliases allows programmers to use the one which is comfortable with. I remember exit better than die. Some others remember die better than exit.
– mauris
Nov 25 '09 at 6:35
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How to convert a PNG image to a SVG? [closed]
...e.svg" # PNM to SVG
rm "$File.pnm" # Remove PNM
One-line command
If you want to convert many files, you can also use the following one-line command:
( set -x ; for f_png in *.png ; do f="${f_png%.png}" ; convert "$f_png" "$f.pnm" && potrace "$f.pnm" -s -o "$f.svg...
Remove spaces from std::string in C++
...space), str.end());
We should also note that remove_if will make at most one copy of the data. Here is a sample implementation:
template<typename T, typename P>
T remove_if(T beg, T end, P pred)
{
T dest = beg;
for (T itr = beg;itr != end; ++itr)
if (!pred(*itr))
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What unique features does Firebug have that are not built-in to Firefox?
...ssing several command line commands.
Can't add cookies, just edit existing ones.
No always-on mode and activation per domain (instead of per tab).
There are more things missing, which are tracked in a bug report filed for all the gaps between Firebug and the Firefox DevTools.
Firebug integration
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Objective-C pass block as parameter
...red the same way function pointer types are, but replacing the * with a ^. One way to pass a block to a method is as follows:
- (void)iterateWidgets:(void (^)(id, int))iteratorBlock;
But as you can see, that's messy. You can instead use a typedef to make block types cleaner:
typedef void (^ Iter...
Get Substring between two characters using javascript
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Does anyone know how I would do this for every occurence of a substring between my starting and ending string?
– MarksCode
Feb 26 '16 at 5:11
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