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To utilize the lsp code action feature in Emacs to broaden the macro in C++, you can follow these steps:

1. Install the CMake project and C++ language server (such as clangd or rtags) on your system.

2. Install the lsp-mode Emacs package.

3. Configure lsp-mode to use the C++ language server by adding the following code in your Emacs configuration file:

(require 'lsp-mode)
(add-hook 'c++-mode-hook #'lsp)

1. Open a C++ source file in Emacs that contains a macro you want to broaden.

2. Place the cursor on the macro and press C-c C-r to trigger the lsp code action feature.

3. Select the "Broaden macro" option from the list of suggested code actions.

4. Review the changes made to the macro and confirm that they are correct.

5. Save the file and continue editing your code.

This process should allow you to easily broaden macros in your C++ code using the lsp code action feature in Emacs.