[Solved] Creating std::map with a structure as its key and value [duplicate]

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As keys in std::map are const your operator< method must be const as well:

  bool operator<(const RJNodeAddress &l) const
                                        // ^ here

it should be const anyway as it does not modify the object but in this case missing it leads to compilation errors.

solved Creating std::map with a structure as its key and value [duplicate]