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並前往https://www.reddit.com/r/cpp_questions/comments/gld2oq/no_match_for_operator_operand_types_are/

no match for 'operator<<' (operand types are 'std::ostream' and ...

I nowhere see usage of string. I see std::ostream, vec2, decltype(vec2.x) (which appears to be double) and char pointer.

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