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yhirose avatar yhirose commented on June 14, 2024

@pwuertz, thanks for the feedback. The semantic value contents are not reused by the parser and each rule can have only one action as you mentioned. So I think it's safe to drop const from semantic values. I'll check the source code thoroughly if the change would cause any side effects. I'll get back to you when the new code becomes available. Thanks!

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yhirose avatar yhirose commented on June 14, 2024

@pwuertz, please see the commit 757e81e. We can now register an action handler which takes non const peg::SemanticValues& svparameter as bellow. You can mutate it or move it.

    parser["ROOT"] = [&](peg::SemanticValues& sv) {
        auto& s = sv[0].get<std::string>();
        s[0] = 'H'; // mutate
        return std::string(std::move(s)); // move
    };

Please let me know if it's not what you meant. Thanks for the thought provoking feedback!

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pwuertz avatar pwuertz commented on June 14, 2024

Sorry the modifications turned out to a bit larger than I thought, but this should be very useful indeed. Thanks!

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