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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...
Closing JDBC Connections in Pool
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When using Connection Pool, should one close the Connection at the end? If so, isn't the purpose of pooling lost? And if not, how does the DataSource know when a particular instance of Connection is freed up and can be reused? I am a little confused on this on...
Foreign Key naming scheme
... involved in the key, so it makes it easy to see which tables a particular one (the first one named) depends on (the second one named). In this scenario the complete set of keys would be:
FK_task_user
FK_note_task
FK_note_user
So you can see that tasks depend on users, and notes depend on both ta...
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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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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Should the hash code of null always be zero, in .NET
...System.Collections.Generic.HashSet<> accept null as a set member, one can ask what the hash code of null should be. It looks like the framework uses 0 :
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What is Unicode, UTF-8, UTF-16?
...d were a few control characters, punctuation, numbers and letters like the ones in this sentence. Unfortunately, today's strange world of global intercommunication and social media was not foreseen, and it is not too unusual to see English, العربية, 汉语, עִבְרִית, ελληνικά,...