Passing Lambda Variables not working in HISE?

[HISEnberg]

On both my systems I receive an error in the console when trying to pass a labmda variable (from inline function to function). This was prompted by the recent videos @David-Healey shared on the topic. The functions seem to work but I am not sure why I receive the error.

Interface:! Line 6, column 60: Accessing parameter reference outside the function call

The examples from the HISE docs are also producing the same error. I know I can script around this if necessary but I am curious to know if anyone else is experiencing the same issue?

Wonder if this is a question for @Christoph-Hart ? Does using lambdas require a certain version of C++? In Visual Studio 2026 the C++ Language Standard is set to ISO C++20 Standard (/std:c++20) , so I think I should be covered here.

Anyone else seeing these error messages?

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[Christoph Hart]

@HISEnberg haha don‘t mix up the extremely complex issue of C++ lambdas (where the C++ standard does in fact have an impact) with our little „lamda“ extension to HiseScript where you can just pass on some variables in a function to a sub function call.

Usually you just need to rename and introduce a variable from a function parameter because you cannot pass on an incoming parameter from the outside function. However this might be another case of „var-local“-gate where I could easily patch things up internally so you and the robot overlords will not need that information in your context window…

[David Healey]

@Christoph-Hart He's using lambda's as expected in HISE - I'm not seeing the error he reports, do you see it?

[HISEnberg]

@Christoph-Hart hehe that makes sense, they seem super simple in HISE which doesn't appear to be true for C++

@David-Healey is correct though, for some reason I am getting an error when using them. If I use his example I get that error message Accessing parameter reference outside the function call

It doesn't seem to be a breaking change as the code still functions. But I see red in the Console and get nervous....

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[Christoph Hart]

@HISEnberg have you enabled the optimizations in the Scripting Settings?