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There is Boost.Spirit. We use it but I find its cleverness just results in incomprehensible code. https://www.boost.org/doc/libs/1_84_0/libs/spirit/classic/doc

• timhh 3y ago
  Ah yeah I should have said "a library for which the integration is easier than writing my own library from scratch"!
• amag 3y ago
  Last I used it, even pretty small grammars took forever to build. I had to be very diligent not to let the grammar cpp-file depend on anything else in my codebase.
• nly 3y ago
  It wouldn't be efficient for expression parsing. Spirit is a recursive descent parser.