Windows: basic compatibilty issues about cppadcodegen HOT 5 OPEN

CppadCodegen does not explicitly support Windows mainly because I don't really use it.
Nevertheless, it would be great to have it working.

Regarding your suggestions:

1. Simple change
2. Simple change
3. The third cannot be implemented just by adding size_t since in Linux (64bit) it is a long unsigned int.
   I'll add new overloading for long long int.

This, however, will not be enough to fully support windows.
For instance, the functions in system.hpp will have to be implemented for windows just as they are for Linux/Mac (linux_system.hpp).

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Yes, that's true, there are a few more changes to make in order to have it working in windows. But particularly with the first two basic issues (see above) respected it's at least a little less cumbersome.
I've got one solution which, I think, is sufficiently stable with VS 2015 and Mingw-w64 (gcc) , and which I can prepare to share once I have a gap. However, so far one little drawback is that this needs a little helper library like dlfcn-win, if one wants to keep it easy and avoid touching all the existing code which handles the created dynamic libraries.

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I've implemented the 3 items.
Can you please check if you can compile it with VS 2015?

What kind of features would you need in the dynamic library handling classes?
If we implement the system.hpp for windows you might get it.

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Alright, thanks.
These 3 changes are working.
However, to make it compile completely more changes are needed.
As said I can prepare these for sharing once I have another gap.
But it's too cumbersome to post all this here.
What would suit you instead, perhaps a pull request?

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Yes, a pull request would be great.
Travis also supports windows now, we can add it to the platforms being tested.

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