Is Mercurial a good option where we have many projects that share source files

The scope of this is that we have three main projects. Some of the source files are shared between the projects. There are nearly 3 milli开发者_如何学编程on lines of code (not including comments or spaces) that has grown over 20 years. We currently use Source Safe for our version tracking. But this is starting to fail us as we expand not only our products but also by how many developers we have playing in different modules that are shared. An example of a shared file would be a template class. The code is solid and is used in many projects. It is a single file so it is just shared between the projects. Now 20 years later that one file has grown to over 1000 files (Yes I would love to refactor and make libraries, not happening). Does Mercurial support the same kind of concept in some way?

Thanks Mark

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Mercurial subrepos may be what you're looking for, if I'm reading your question correctly.