[choppaface]

Copy-pasta is typically a no-no, but this tool sure helps experiment especially when templates / types are complex.

Moreover things like SFINAE, variadic functions, and macros can make some libraries really opaque. Stuff like loggers, pub-subs, SERDES code... there will be a lot of template complexity and other indirection where this tool would help dramatically in peeling back the layers and could be used in place of breakpoints or a traditional debugger. (And it can often be hard to set up a debug session for large systems).

Can also be useful when you want to take an existing function and customize it for the call site versus write a new helper. For example maybe you want std::find_if() but instead of writing a lambda predicate you want some other code embedded into the body of the loop.