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@@ -41,6 +41,8 @@ With (2), the bytes written before the exception remain in the output adapter.
above 9223372036854775807, which BON8 cannot represent
- Throws [type_error.316](../../home/exceptions.md#jsonexceptiontype_error316) if `j` contains a string that is not
valid UTF-8
- Throws [type_error.321](../../home/exceptions.md#jsonexceptiontype_error321) if `j` or a value nested in it is
discarded; example: `"cannot serialize discarded value to BON8"`
## Complexity
@@ -53,13 +55,36 @@ Linear in the size of the JSON value `j`.
The example shows the serialization of a JSON value to a byte vector in BON8 format.
```cpp
--8<-- "examples/to_bon8.cpp"
#include <iostream>
#include <iomanip>
#include <nlohmann/json.hpp>
using json = nlohmann::json;
using namespace nlohmann::literals;
int main()
{
// create a JSON value
json j = R"({"compact": true, "format": "BON8", "schema": 0})"_json;
// serialize it to BON8
std::vector<std::uint8_t> v = json::to_bon8(j);
// print the vector content
for (auto& byte : v)
{
std::cout << "0x" << std::hex << std::setw(2) << std::setfill('0') << (int)byte << " ";
}
std::cout << std::endl;
}
```
Output:
```json
--8<-- "examples/to_bon8.output"
0x89 0x63 0x6f 0x6d 0x70 0x61 0x63 0x74 0xf9 0x66 0x6f 0x72 0x6d 0x61 0x74 0xff 0x42 0x4f 0x4e 0x38 0xff 0x73 0x63 0x68 0x65 0x6d 0x61 0x90
```
??? example "Example: type_error.316 exception"
@@ -68,13 +93,36 @@ Linear in the size of the JSON value `j`.
as UTF-8.
```cpp
--8<-- "examples/to_bon8__exception.cpp"
#include <iostream>
#include <nlohmann/json.hpp>
using json = nlohmann::json;
int main()
{
// create a JSON string that is not valid UTF-8
std::string invalid_utf8;
invalid_utf8.push_back(static_cast<char>(0xFF));
json j = invalid_utf8;
// exception type_error.316
try
{
json::to_bon8(j);
}
catch (const json::type_error& e)
{
std::cout << e.what() << '\n';
}
}
```
Output:
```json
--8<-- "examples/to_bon8__exception.output"
[json.exception.type_error.316] invalid UTF-8 byte at index 0: 0xFF
```
## See also