Node access with YAML::Node fails where it succeds with std::string

[SGSSGene]

I have a YAML::Node which I use as a map. When accessing the map with std::string everything works fine. But if I access it with a YAML::Node which just represents the value of my previous std::string it fails.

Using doc1 one fails. I expected doc1[key1] == doc1[key2]. If I create the content of my document with key2 (see doc2), then everything works as expected.

Is this a yaml-cpp bug? Or am I overlooking something?

#include <iostream>
#include <yaml-cpp/yaml.h>

int main() {
    std::string key1 = "xs";
    YAML::Node key2;
    key2 = key1;

    // Creating yaml document with std::string access
    YAML::Node doc1;
    doc1[key1][0] = 0;
    doc1[key1][1] = 1;
    doc1[key1][2] = 2;

    {
        YAML::Emitter e;
        e << doc1;
        std::cout << "doc1:\n" << e.c_str() << "\n";
    }
    {
        YAML::Emitter e;
        e << doc1[key1];
        std::cout << "only xs with key1:" << e.c_str() << "\n";
    }

    //This fails!
    {
        YAML::Emitter e;
        e << doc1[key2];
        std::cout << "only xs with key2:" << e.c_str() << "\n";
    }

    // expecting doc1[key1] == doc1[key2] which is not true

    // Creating yaml document with YAML::Node access
    YAML::Node doc2;
    doc2[key2][0] = 0;
    doc2[key2][1] = 1;
    doc2[key2][2] = 2;

    {
        YAML::Emitter e;
        e << doc2;
        std::cout << "doc2:\n" << e.c_str() << "\n";
    }
    {
        YAML::Emitter e;
        e << doc2[key1];
        std::cout << "only xs with key1:" << e.c_str() << "\n";
    }

    // Here it doesn' fail
    {
        YAML::Emitter e;
        e << doc2[key2];
        std::cout << "only xs with key2:" << e.c_str() << "\n";
    }
}

[david-mohr]

It should work if you access it as a string, e.g.

doc1[key2.as<string>()]

[SGSSGene]

It should work if you access it as a string, e.g.

doc1[key2.as<string>()]

Yes of course, but I don't know what key2 is. It does not have to be a std::string, and it should work with std::string.