44 lines
1.1 KiB
C++
44 lines
1.1 KiB
C++
#include <iostream>
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#include <nlohmann/json.hpp>
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// simple output function
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template<typename Map>
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void output(const char* prefix, const Map& m)
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{
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std::cout << prefix << " = { ";
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for (auto& element : m)
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{
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std::cout << element.first << ":" << element.second << ' ';
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}
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std::cout << "}" << std::endl;
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}
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int main()
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{
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// create and fill two maps
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nlohmann::ordered_map<std::string, std::string> m_ordered;
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m_ordered["one"] = "eins";
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m_ordered["two"] = "zwei";
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m_ordered["three"] = "drei";
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std::map<std::string, std::string> m_std;
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m_std["one"] = "eins";
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m_std["two"] = "zwei";
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m_std["three"] = "drei";
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// output: m_ordered is ordered by insertion order, m_std is ordered by key
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output("m_ordered", m_ordered);
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output("m_std", m_std);
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// erase and re-add "one" key
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m_ordered.erase("one");
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m_ordered["one"] = "eins";
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m_std.erase("one");
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m_std["one"] = "eins";
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// output: m_ordered shows newly added key at the end; m_std is again ordered by key
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output("m_ordered", m_ordered);
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output("m_std", m_std);
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}
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