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@@ -42,13 +42,32 @@ If you do want to preserve the **insertion order**, you can use the type [`nlohm
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??? example "Example: `ordered_json` preserves insertion order"
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```cpp
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--8<-- "examples/ordered_json.cpp"
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#include <iostream>
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#include <nlohmann/json.hpp>
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using ordered_json = nlohmann::ordered_json;
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int main()
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{
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ordered_json j;
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j["one"] = 1;
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j["two"] = 2;
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j["three"] = 3;
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std::cout << j.dump(2) << '\n';
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}
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```
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Output:
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```json
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--8<-- "examples/ordered_json.output"
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{
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"one": 1,
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"two": 2,
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"three": 3
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}
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```
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Alternatively, [`nlohmann::fifo_map`](https://github.com/nlohmann/fifo_map) also preserves the insertion order and, unlike [`ordered_map`](../api/ordered_map.md), keeps a lookup index, so it does not have the quadratic cost described below. It is used through a small adapter ([integration](https://github.com/nlohmann/json/issues/485#issuecomment-333652309)).
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