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nlohmannjson/doc/examples/clear.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 JSON values
json j_null;
json j_boolean = true;
json j_number_integer = 17;
json j_number_float = 23.42;
json j_object = {{"one", 1}, {"two", 2}};
json j_array = {1, 2, 4, 8, 16};
json j_string = "Hello, world";
// call clear()
j_null.clear();
j_boolean.clear();
j_number_integer.clear();
j_number_float.clear();
j_object.clear();
j_array.clear();
j_string.clear();
// serialize the cleared values()
std::cout << j_null << '\n';
std::cout << j_boolean << '\n';
std::cout << j_number_integer << '\n';
std::cout << j_number_float << '\n';
std::cout << j_object << '\n';
std::cout << j_array << '\n';
std::cout << j_string << '\n';
}