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Question: How to erase subtree #622

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kimwalisch opened this issue Jun 17, 2017 · 2 comments
Closed

Question: How to erase subtree #622

kimwalisch opened this issue Jun 17, 2017 · 2 comments
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kind: question solution: proposed fix a fix for the issue has been proposed and waits for confirmation

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@kimwalisch
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Hi,

Thanks for your awesome library! I use it in my primecount project.

I would like to erase a subelement/subtree, e.g. in the example below I would like to erase ["S2_hard"]["thread1"]. Note that "thread1" may also exist in other subtrees e.g. ["S2_easy"]["thread1"] which should not be erased.

{
    "S2_hard": {
        "low": 16007169,
        "percent": 6.32297670017418,
        "s2_hard": "41872228438534",
        "seconds": 1.66252099978738,
        "segment_size": 131072,
        "segments": 24,
        "thread0": {
            "low": 9715713,
            "segment_size": 131072,
            "segments": 24
        },
        "thread1": {
            "low": 12861441,
            "segment_size": 131072,
            "segments": 24
        },
        "x": "100000000000000000",
        "y": 10990372,
        "z": 9098873086
    }
}

How can I achieve this?

@nlohmann
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The erase function can do this:

#include "json.hpp"

using json = nlohmann::json;

int main()
{
    json j = R"({
        "S2_hard": {
            "low": 16007169,
            "percent": 6.32297670017418,
            "s2_hard": "41872228438534",
            "seconds": 1.66252099978738,
            "segment_size": 131072,
            "segments": 24,
            "thread0": {
                "low": 9715713,
                "segment_size": 131072,
                "segments": 24
            },
            "thread1": {
                "low": 12861441,
                "segment_size": 131072,
                "segments": 24
            },
            "x": "100000000000000000",
            "y": 10990372,
            "z": 9098873086
        }
    })"_json;

    // remove key "thread1"
    j["S2_hard"].erase("thread1");

    std::cout << std::setw(2) << j << std::endl;
}

@nlohmann nlohmann added kind: question solution: proposed fix a fix for the issue has been proposed and waits for confirmation labels Jun 17, 2017
@kimwalisch
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Thanks!

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