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How to specialize std::hash::operator() for user-defined type in unordered containers?
To support user-defined key types in std::unordered_set<Key> and std::unordered_map<Key, Value>
one has to provide operator==(Key, Key) and a hash functor:
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SQL how to increase or decrease one for a int column in one command
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To answer the first:
UPDATE Orders SET Quantity = Quantity + 1 WHERE ...
To answer the second:
There are several ways to do this. Since you did not specify a database, I will assume MySQL.
INSERT INTO table SET x=1, y=2 ON DUPLICATE KEY UPDATE x=x+1, y=y...
Uri to default sound notification?
...RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
builder.setSound(uri);
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JPQL IN clause: Java-Arrays (or Lists, Sets…)?
I would like to load all objects that have a textual tag set to any of a small but arbitrary number of values from our database. The logical way to go about this in SQL would be to build an "IN" clause. JPQL allows for IN, but it seems to require me to specify every single parameter to IN directly (...
how to set a value for a span using JQuery
How to set a value for a span using JQuery..
5 Answers
5
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How do you programmatically set an attribute?
Suppose I have a python object x and a string s , how do I set the attribute s on x ? So:
4 Answers
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What is meant by Ems? (Android TextView)
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android:ems or setEms(n) sets the width of a TextView to fit a text of n 'M' letters regardless of the actual text extension and text size. See wikipedia Em unit
but only when the layout_width is set to "wrap_content". Other layout_width v...
Git - How to use .netrc file on Windows to save user and password
...c file in %HOME%
If you are using Windows 7/10, in a CMD session, type:
setx HOME %USERPROFILE%
and the %HOME% will be set to 'C:\Users\"username"'.
Go that that folder (cd %HOME%) and make a file called '_netrc'
Note: Again, for Windows, you need a '_netrc' file, not a '.netrc' file.
Its con...
Linux: is there a read or recv from socket with timeout?
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You can use the setsockopt function to set a timeout on receive operations:
SO_RCVTIMEO
Sets the timeout value that specifies
the maximum amount of time an input
function waits until it completes. It
accepts a timeval structur...
Json.net serialize/deserialize derived types?
...ur text (as you should be in this scenario), you can use the JsonSerializerSettings.
See: how to deserialize JSON into IEnumerable<BaseType> with Newtonsoft JSON.NET
Be careful, though. Using anything other than TypeNameHandling = TypeNameHandling.None could open yourself up to a security vu...