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Should a retrieval method return 'null' or throw an exception when it can't produce the return value
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Only throw an exception if it is truly an error. If it is expected behavior for the object to not exist, return the null.
Otherwise it is a matter of preference.
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Why is this program erroneously rejected by three C++ compilers?
...haracter set), so it cannot move into further processing stages, hence the error. It is entirely possible that your compiler support a mapping from image to basic source character set, but is not required to.
Since this mapping is implementation-defined, you'll need to look at your implementations...
“ClickOnce does not support the request execution level 'requireAdministrator.'”
...other touches, such as a description or name.
Out of the blue, I get an error that will not go away. ClickOnce does not support the request execution level 'requireAdministrator'. Now, I hadn't touched ClickOnce in this application. All I had done was include a manifest file requesting these pe...
AngularJS passing data to $http.get request
... called asynchronously // when the response is available }). error(function(data, status, headers, config) { // called asynchronously if an error occurs // or server returns response with an error status. });
– Ehud Grand
Sep 1 '14...
Redirect all output to file [duplicate]
...dirlist" directs only the standard output to dirlist, because the standard error was duplicated from the standard output before the standard output was redirected to dirlist" :)
– shelleybutterfly
Jul 13 '11 at 5:33
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How to get MVC action to return 404
...(maybe because it has been deleted), I want to return a 404 and display an error page.
12 Answers
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Attempt to present UIViewController on UIViewController whose view is not in the window hierarchy
Just started using Xcode 4.5 and I got this error in the console:
33 Answers
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Error in SQL script: Only one statement is allowed per batch
...eployment, but when I try to build the VS project for 3 of them I get this error:
3 Answers
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Saving and loading objects and using pickle
... File "C:\Python31\lib\pickle.py", line
1365, in load encoding=encoding,
errors=errors).load() EOFError
After you have read the contents of the file, the file pointer will be at the end of the file - there will be no further data to read. You have to rewind the file so that it will be read from ...
Rails: What's a good way to validate links (URLs)?
...url?(uri)
uri = URI.parse(uri) && uri.host
rescue URI::InvalidURIError
false
end
You can even decide to make it more restrictive. For instance, if you want the URL to be an HTTP/HTTPS URL, then you can make the validation more accurate.
require 'uri'
def valid_url?(url)
uri = URI.par...