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NaN problem within develop branch #693
Description
Library json is a very nice and foregoing work.
I noticed that develop branch made effort on the bug of NaN and INF problem. however after deserialization of a serialized json object containing nan, an exception is throwed. binary serialization works fine.
#include <json.hpp>
#include <vector>
#include <iostream>
using json = nlohmann::json;
int main() {
std::vector<double> a;
a.push_back(std::numeric_limits<double>::quiet_NaN());
a.push_back(2);
json j;
j["vec"] = a;
j["number"] = std::numeric_limits<double>::quiet_NaN();
std::string strj = j.dump();
json j2 = json::parse(strj);
std::vector<double> b = j2["vec"];
std::cout << b[0] << std::endl;
double n = j2["number"];
std::cout << n << std::endl;
return 0;
}
Activity
nlohmann commentedon Aug 11, 2017
RFC 7159 states:
The library dumps inf and NaN to
null. This is documented in https://nlohmann.github.io/json/classnlohmann_1_1basic__json_a88d6103cb3620410b35200ee8e313d97.html#a88d6103cb3620410b35200ee8e313d97.Therefore,
strjisso
j2["number"]isnulland cannot be converted todouble, hence the exceptionBinary serialization works, because CBOR and MessagePack do not have the limitations about inf and NaN.