virtual

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I've only been working with C++ for 2~3 months and recently I found out about the identifier, final , that comes after a virtual function. To this day, I believed that omission of virtual will stop the propagation of virtualness but I was wrong. It implicitly propagates. My question is this. Why allow implicit propagation? Why can't an existence of virtual make a function virtual and absense of virtual make a function not virtual? Is is better in some circumstance? or Was it, back in the day when virtual was first introduced? According to Clifford's answer , there even is a compiler that

By definition virtual properties or methods are methods visible to sub classes to be overridden. But, NHibernate for example uses virtual properties to ensure lazy loading. My question is not about NHibernate, but how you could use virtual properties to achieve lazy loading? Are there any hidden behaviors about virtual properties that I don't know? The fact that they are declared virtual allows NHibernate to override the property and create a proxy implementation for it - the proxy in turn they can use to implement lazy loading on the first access of the property. There is no hidden behavior

public abstract class MyBase { public abstract bool MyProperty { get; protected set; } } public class MyClass : MyBase { public MyClass() { this.MyProperty = true; } public override bool MyProperty { get; protected set; } } The constructor MyClass() causes CA2214: Do not call overridable methods in constructors. This normally only shows if one calls a virtual method defined in the same class as the constructor. e.g. Accessing MyProperty inside MyBase 's constructor. Here I am calling a non-virtual overridden implementation of an inherited abstract property inside the derived class' constructor

I've got a problem where I need to "simulate" microphone output. Data will be coming over the network, decoded into PCM and basically needs to be written into the mic - which then other programs can read/record/whatever. I've been reading up on alsa but information is pretty sparse. The file plugin seemes promising - I was thinking of having a named pipe as "infile" which I could then deliver data to from my application. I can't get it to work however (vlc/audacity just segfault). pcm.testing { type file slave { pcm { type hw card 0 device 0 } } infile "/dev/urandom" format "raw" } Are there

Given an object, how can I tell if that object has virtual properties? var entity = repository.GetByID(entityId); I tried looking in: PropertyInfo[] properties = entity.GetType().GetProperties(); But couldn't discern if any of the properties would indicate virtual. PropertyInfo[] properties = entity.GetType().GetProperties() .Where(p => p.GetMethod.IsVirtual).ToArray(); Or, for .NET 4 and below: PropertyInfo[] properties = entity.GetType().GetProperties() .Where(p => p.GetGetMethod().IsVirtual).ToArray(); That will get a list of public virtual properties. It won't work for write-only