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ref class Item : GameObject { // ... }; // the user's class ref class Scroll : Item { public: virtual void Read() new { // Read the scroll in the game environment. Console::WriteLine("Scroll::Read"); } }; int main() { Scroll^ scroll = gcnew Scroll(); Item^ item = scroll; item->Initialize(true); scroll->Read(); } The output of Listing 8-5 is as follows: GameObject::Read Scroll::Read You might wonder about the new keyword being used here in a different context. Isn t that a problem It s not a problem because the compiler is sensitive to the context in which the new keyword is used.

Seibel: Where did you get the idea to write a byte-code interpreter Ingalls: That was a mechanism The big thing that I was grappling with was that Smalltalk-72 parsed on the fly and for two reasons, at least, we needed to be able to compile something that had those kinds of semantics but that didn t require parsing everything on the fly So I came up with the Smalltalk-76 syntax, which is pretty much the Smalltalk-80 syntax Then the question is, what do you compile that into that will run effectively this way The only place where it got complicated.

I always seemed to be behind, always reacting to a situation or need, and rarely finding time to be proactive Over time, I learned how to get ahead and I hope that the information in the preceding chapters allows for you to do the same..

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Dan Ingalls was in doing what we called remote evaluation variables you declare up here but they get evaluated down here This is what ended up as blocks in Smalltalk, which are like closures in other systems Seibel: Why not just compile to machine code Ingalls: We were still very space-conscious and this stuff wound up incredibly compact compared to anything else around And it needed to be that compact because we were still trying to run this on Altos that had 96K Then they came out with the big one, which was 128K The compactness was important Seibel: Meaning the generated code would be smaller because the byte codes were richer than native machine instructions Ingalls: Yeah I also just plain loved the idea and was inspired by Peter Deutsch s work on the byte-code engine for Lisp.

The contextual keyword override is used to indicate an intentional override of a virtual function. Because new and override are required when overriding a virtual function, you are always forced to make a conscious decision about whether your newly created function is intended to override the virtual function or be a new function altogether. Some methods are intended to be overridden frequently. The ToString method on Object is commonly overridden to provide type-specific output. In 7 (Listing 7-8), you saw a class that overrides the ToString method:

I was further inspired by this synergy it s another one of these kernels that could fit in microcode From the beginning I envisioned it as going into the microcode of the Alto Seibel: And the microcode was RAM so you could put the Smalltalk kernel in there and then switch to Lisp and put the Lisp byte-code interpreter in there Ingalls: Yup Seibel: Then what was the next evolution Ingalls: Smalltalk-76 inherited all the same sort of graphics baggage a lot of special code for line drawing, text display, and so on But at that time I had done BitBlt, so I rewrote the kernel so all the graphics just used BitBlt and Smalltalk, so that made the kernel much smaller That was Smalltalk-78, which was the first one we ran on a microprocessor on an 8086 But that still wasn t Smalltalk in Smalltalk.

The Smalltalk in Smalltalk wasn t until Squeak Smalltalk-80 had a virtual machine spec that was published in the book, but all the implementations were in C or assembly code Seibel: What about the compiler.

class ElementType { public: virtual String^ ToString() override { return String::Format( "Element {0} Symbol {1} Atomic Number {2} Atomic Weight {3}", Name, Symbol, AtomicNumber, AtomicWeight); } // ... }; Other methods are less frequently overridden, such as the Equals method on Object. Continuing with the role-playing game example, suppose we need to modify the Read method since we are storing the spell information in the file, so that needs some additional parsing in the Read method. We use override to implement the Read virtual function for the Scroll class differently from the GameObject class, as shown in Listing 8-6. Listing 8-6. Using override to Implement a Virtual Function // override.cpp using namespace System; // the game library's classes ref class GameObject { public: void Initialize(bool fromFile) { if (fromFile) { Read(); } else { // other code } } virtual void Read() { // general reading from a file for the GameObject Console::WriteLine("GameObject::Read"); } };

Dan Ingalls Ingalls: The compiler was written in Smalltalk Actually, when we were doing the Smalltalk-80 books, Dave Robson and I it was mainly his work wrote a Smalltalk emulation of the byte-code interpreter As part of the Smalltalk-80 release we wanted to help people build their own virtual machines We had discovered that one of the most useful aids was a trace of exactly what byte-codes get executed in what order when you first start up the system So he wrote an emulator in Smalltalk, because our Smalltalk was getting fast enough that that was a reasonable thing to do, and produced all those traces that would help people debugging.

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