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@@ -68,13 +68,36 @@ Linear in the size of the JSON value `j`.
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The example shows the serialization of a JSON value to a byte vector in MessagePack format.
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```cpp
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--8<-- "examples/to_msgpack.cpp"
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#include <iostream>
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#include <iomanip>
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#include <nlohmann/json.hpp>
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using json = nlohmann::json;
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using namespace nlohmann::literals;
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int main()
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{
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// create a JSON value
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json j = R"({"compact": true, "schema": 0})"_json;
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// serialize it to MessagePack
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std::vector<std::uint8_t> v = json::to_msgpack(j);
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// print the vector content
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for (auto& byte : v)
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{
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std::cout << "0x" << std::hex << std::setw(2) << std::setfill('0') << (int)byte << " ";
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}
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std::cout << std::endl;
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}
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```
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Output:
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```json
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--8<-- "examples/to_msgpack.output"
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0x82 0xa7 0x63 0x6f 0x6d 0x70 0x61 0x63 0x74 0xc3 0xa6 0x73 0x63 0x68 0x65 0x6d 0x61 0x00
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```
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??? example "Example: out_of_range.415 exception"
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@@ -83,13 +106,34 @@ Linear in the size of the JSON value `j`.
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MessagePack ext type stores the subtype in a single byte.
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```cpp
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--8<-- "examples/to_msgpack__exception.cpp"
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#include <iostream>
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#include <nlohmann/json.hpp>
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using json = nlohmann::json;
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int main()
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{
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// create a JSON value with a binary subtype that exceeds 255
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json j = json::binary({1, 2, 3}, 300);
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// exception out_of_range.415
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try
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{
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json::to_msgpack(j);
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}
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catch (const json::out_of_range& e)
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{
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std::cout << e.what() << '\n';
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}
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}
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```
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Output:
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```json
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--8<-- "examples/to_msgpack__exception.output"
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[json.exception.out_of_range.415] subtype 300 is too large for the MessagePack ext type (max 255)
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```
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## See also
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