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nlohmannjson/doc/examples/operator__notequal__nullptr_t.cpp

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#include <iostream>
#include <nlohmann/json.hpp>
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using json = nlohmann::json;
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int main()
{
// create several JSON values
json array = {1, 2, 3};
json object = {{"A", "a"}, {"B", "b"}};
json number = 17;
json string = "foo";
json null;
// output values and comparisons
std::cout << std::boolalpha;
std::cout << array << " != nullptr " << (array != nullptr) << '\n';
std::cout << object << " != nullptr " << (object != nullptr) << '\n';
std::cout << number << " != nullptr " << (number != nullptr) << '\n';
std::cout << string << " != nullptr " << (string != nullptr) << '\n';
std::cout << null << " != nullptr " << (null != nullptr) << '\n';
}