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This seems to do what you're asking, although I haven't tried it: https://github.com/FrancescoMagliocco/vim-uctags.
If you are using Neovim, Tree-sitter does this very well for quite a number of languages, inc C and C++. https://github.com/nvim-treesitter/nvim-treesitter
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Hence, a higher number means a more popular project.