[llvm-dev] typedef or using in C++ code

Justin Bogner via llvm-dev llvm-dev at lists.llvm.org
Wed Sep 7 21:15:34 PDT 2016

Mehdi Amini via llvm-dev <llvm-dev at lists.llvm.org> writes:
>> On Sep 7, 2016, at 4:50 PM, Joerg Sonnenberger via llvm-dev
>> <llvm-dev at lists.llvm.org> wrote:
>> On Wed, Sep 07, 2016 at 04:30:01PM -0700, Eugene Zelenko via llvm-dev wrote:
>>> What should be used for type declarations: typedef or using? typedef
>>> is there because of historical reasons, but LLVM code based is C++11
>>> now.
>>> LLVM Coding Standards are not clear on this matter.
>> Can you give some context for the situation you wonder about? They are
>> both valid in some situation.
> Are there cases were typedef is (technically) preferable (or needed)
> compared to using?

There's `extern "C"`. Other than that the `using` syntax provides a
struct superset of the functionality. It would be perfectly reasonable
to prefer `using` in new code.

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