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Why would one use nested classes in C++?

Can someone please point me towards some nice resources for understanding and using nested classes? I have some material like Programming Principles and things like this IBM Knowledge Center - Nested Classes ...
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Nested attributes unpermitted parameters

... many Due objects. The Due object also belongs to a Person . I want a form that can create the Bill and its children Dues all in one page. I am trying to create a form using nested attributes, similar to ones in this Railscast . ...
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How to make input type= file Should accept only pdf and xls

... Unfortunately, there is no guaranteed way to do it at time of selection. Some browsers support the accept attribute for input tags. This is a good start, but cannot be relied upon completely. <input type="file" name="pic"...
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Simple way to transpose columns and rows in SQL?

... There are several ways that you can transform this data. In your original post, you stated that PIVOT seems too complex for this scenario, but it can be applied very easily using both the UNPIVOT and PIVOT functions in SQL Server. However, if you do not have acces...
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Android - implementing startForeground for a service?

... not sure where/how to implement this method to make my service run in the foreground. Currently I start my service by the following in another activity: ...
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How to find foreign key dependencies in SQL Server?

How can I find all of the foreign key dependencies on a particular column? 13 Answers ...
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How can I record a Video in my Android App.?

...ecorder(); } public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { } public void surfaceDestroyed(SurfaceHolder holder) { if (recording) { recorder.stop(); recording = false; } recorder.rele...
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Return 0 if field is null in MySQL

... thank you so much !! This is exactly what i was looking for – brunobliss Dec 21 '16 at 13:22 @MarkB...
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How to change the text on the action bar

...the application and I want it to display something custom and be different for each screen in my app. 18 Answers ...
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Pandas aggregate count distinct

... Thanks @TedPetrou, I am the Coder Formerly Known as Blodwyn Pig ;) – Ricky McMaster Oct 18 '18 at 13:20 ...