json/doc/examples/to_ubjson.cpp

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#include <iostream>
#include <nlohmann/json.hpp>
using json = nlohmann::json;
// function to print UBJSON's diagnostic format
void print_byte(uint8_t byte)
{
if (32 < byte and byte < 128)
{
std::cout << (char)byte;
}
else
{
std::cout << (int)byte;
}
}
int main()
{
// create a JSON value
json j = R"({"compact": true, "schema": false})"_json;
// serialize it to UBJSON
std::vector<uint8_t> v = json::to_ubjson(j);
// print the vector content
for (auto& byte : v)
{
print_byte(byte);
}
std::cout << std::endl;
// create an array of numbers
json array = {1, 2, 3, 4, 5, 6, 7, 8};
// serialize it to UBJSON using default representation
std::vector<uint8_t> v_array = json::to_ubjson(array);
// serialize it to UBJSON using size optimization
std::vector<uint8_t> v_array_size = json::to_ubjson(array, true);
// serialize it to UBJSON using type optimization
std::vector<uint8_t> v_array_size_and_type = json::to_ubjson(array, true, true);
// print the vector contents
for (auto& byte : v_array)
{
print_byte(byte);
}
std::cout << std::endl;
for (auto& byte : v_array_size)
{
print_byte(byte);
}
std::cout << std::endl;
for (auto& byte : v_array_size_and_type)
{
print_byte(byte);
}
std::cout << std::endl;
}