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A comment on C++20 Ranges. Parent comment

Re:C++20 Ranges by tomnj on Saturday December 22, 2018 @09:16PM (#18743971)
Nothing comes for free though. While we can easily write list comprehensions in Haskell or Python, their implementations are complicated. In the case of Haskell and Python, lists and comprehensions are language features, and for C++ ranges, they’re implemented as a library. Both approaches provide building blocks for users to build software and not have to roll their own implementations.
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Re:C++20 Ranges by marcosdumay on Saturday December 22, 2018 @09:40PM (#18744067)
Haskell list comprehensions are a small layer of syntactic sugar over the monadic implementation, that is implemented on a library (that comes with the compiler, but it's still a library).

It is entirely dependent on lazynes, first class functions and complex compiler optimizations. But there isn't much specific code for comprehensions there.

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