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I'm using flycheck in cc-mode and it reminds me when I'm typing:

member reference type 'ListNode *' is a pointer; did you mean to use '->'?

I want to know if there's any package can convert . into -> automatically when typing in C/C++ code, just like Qt Creator's default behavior?

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Not completely automatic, but flycheck-ycmd supports that because it uses Clang under the hood and Clang's fix-its are available from Emacs.

Position the point under the variable, just do M-x ycmd-fixit and accept the proposed fix-it.

You can disable the prompt before applying a fix-it by eval'ing

(setq ycmd-confirm-fixit nil)

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