sync:Add nullptr Json::Value constructor · Pull Request !26 · src-openEuler/jsoncpp

I found some unexpected behavior when using this library when comparing a Json::Value to nullptr. This was my sample program:

#include <jsoncpp/json/json.h>
#include <iostream>

int main()
{
    Json::Value test("Hello world!");
    Json::Value test2(Json::nullValue);

if (test == nullptr)
    {
        std::cout << "test is null" << std::endl;
    }

if (test2 == nullptr)
    {
        std::cout << "test2 is null" << std::endl;
    }

return 0;
}
Since before this change, Json::Value objects can be compared with other Json::Value objects, a implicit Json::Value object will be constructed with nullptr as it's parameters. Given the only valid constructor for nullptr was the const char *, the program aborts with the following output:

terminate called after throwing an instance of 'Json::LogicError'
  what():  Null Value Passed to Value Constructor
Aborted
To improve this experience, I've explicitly deleted the nullptr_t constructor, so that the above code will result in a compile time error.

链接：https://github.com/open-source-parsers/jsoncpp/pull/1194

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