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What is The Rule of Three?
...ncopyable resources
Some resources cannot or should not be copied, such as file handles or mutexes.
In that case, simply declare the copy constructor and copy assignment operator as private without giving a definition:
private:
person(const person& that);
person& operator=(const per...
How to use XPath in Python?
...ibxml2.
Sample of libxml2 XPath Use
import libxml2
doc = libxml2.parseFile("tst.xml")
ctxt = doc.xpathNewContext()
res = ctxt.xpathEval("//*")
if len(res) != 2:
print "xpath query: wrong node set size"
sys.exit(1)
if res[0].name != "doc" or res[1].name != "foo":
print "xpath query: ...
Rename a dictionary key
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@MERose Add the Python file somewhere in your module search path and import OrderedDict from it. But I would recommend: Create a class that inherits from OrderedDict and add a rename method to it.
– Ashwini Chaudhary
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Android: Clear the back stack
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What about adding in manifests file for related activity :
android:noHistory="true"
to the activity definition of B and C ? They will not be added to the backstack. Not sure if that is what you want.
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Activity has leaked window that was originally added
...round of the AsyncTask class but without declare it in the AndroidManifest file using the property android:name like this: android:name="my.package.MyApplicationClass". A good practice when using AsyncTask it is always remember to instantiate your alert inside the method onPreExecute and dismissing ...
Windows equivalent to UNIX pwd
... works for me on Vista because WinAvr installed pwd.exe and added \Program Files\WinAvr\Utils\bin to my path.
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Changing case in Vim
... for lowercase.
For more of these, see Section 3 in Vim's change.txt help file.
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Setting background-image using jQuery CSS property
...ncodeURIComponent(thumbData.url) + ')'); gave me background-image: url("%2Ffiles%2Fusers%2Fthumbs%2F36206608-hd-pics-3.jpg");
– Daerik
Sep 15 '17 at 2:21
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Converting Java objects to JSON with Jackson
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This might be useful:
objectMapper.writeValue(new File("c:\\employee.json"), employee);
// display to console
Object json = objectMapper.readValue(
objectMapper.writeValueAsString(employee), Object.class);
System.out.println(objectMapper.writerWithDefaultPrettyPrinter...
Best way to convert strings to symbols in hash
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Sweet! Is there a way to set YAML#load_file to default all keys to symbols instead of strings w/o having to begin every key with a colon?
– ma11hew28
Feb 9 '11 at 2:31
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