The New Old Thing, of Fun with Lambdas
summary
Example code uses generic lambdas and variadic pack expansion capture and exposes divergent behavior: Clang prints 1 2 3 4, GCC prints 4 3 2 1, one build of MSVC shows 4 3 2 1 and an ARM-target build shows 1 2 3 4, and one compiler bug is fixed during testing. The claim is that C++ must mandate left-to-right evaluation (proposal for C++17), with a small potential cost on some architectures and a noticeable change in existing programs' behavior.
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