CrystalRuby: Embed Crystal Code Directly in Ruby

[kojix2]

I wonder if this project avoids the famous limitation of Crystal’s shared libraries that only one library can be used at a time?

Embeddable / Interoperable with ruby

Let’s take this code: def foo(x) if x.is_a?(Int32) 1 else 2 end end foo(1 || 'a') foo('a' || 1) We can compile it like this: crystal build --prelude=empty --emit llvm-ir foo.cr That will give us the LLVM IR for that file, and specifically for what the generated foo function is. How does the generated code check if x.is_a?(Int32)? The answer is that Crystal gives each type a unique ID: an integer. Here’s the LLVM IR code for the generated foo function: define internal i32 @"…

But it is good that more people will have the opportunity to learn about the Crystal language. Hopefully someday the conflicting function names in the shared library will be mangled so that we can freely call libraries written in Crystal from other languages such as Ruby.