How to capture by reference?

[denzor200]

Is it possible with Boost Lambda 2? Is that truth that this library forces the users to capture by value?

[pdimov]

std::ref should work. Is there a specific example where there's a problem?

[denzor200]

Is there a specific example where there's a problem?

Nope, not a specific use case at all, moreover - I'm not going to capture by reference via this library in a real code :)

The situation is that I am currently collecting ideas for improving the Clang Tidy static analysis tool.
Recently I've submitted nice Feature Request(llvm/llvm-project#120863) to seek and hint UB that's created due to incorrect C++11 lambda usage.

Then all I want to know is whether it is possible to reproduce the same UB by incorrectly using Boost Lambda 2 instead of C++11 lambda.

std::ref should work.

Hmmm, sounds interesting. I will try std::ref to reproduce that UB