[llvm-bugs] [Bug 34865] Clang doesn't require references to be listed in lambda capture

via llvm-bugs llvm-bugs at lists.llvm.org
Mon Oct 30 17:02:16 PDT 2017


Richard Smith <richard-llvm at metafoo.co.uk> changed:

           What    |Removed                     |Added
             Status|RESOLVED                    |REOPENED
         Resolution|INVALID                     |---

--- Comment #4 from Richard Smith <richard-llvm at metafoo.co.uk> ---
Reopening: while the warning may be correct, the location if the diagnostic is
not quite right. We should instead be pointing at the point of use:

test2.cpp:4:29: warning: lambda capture 'varRef' is not required to be captured
for this use [-Wunused-lambda-capture]
    return [&varRef]{return varRef;}();

... and it'd be a good idea to add a note, something like:

test2.cpp:3:29: note: 'varRef' is a reference bound to a constant expression
evaluating to 'var'; that lvalue will be used in place of 'varRef' in the
lambda body
    int& varRef = var;

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