static basic_json diff(const basic_json& source,
                       const basic_json& target);

Creates a JSON Patch so that value source can be changed into the value target by calling patch function.

For two JSON values source and target, the following code yields always #!cpp true:

source.patch(diff(source, target)) == target;

source (in) : JSON value to compare from

target (in) : JSON value to compare against

a JSON patch to convert the source to target

Strong guarantee: if an exception is thrown, there are no changes in the JSON value.

Linear in the lengths of source and target.

Currently, only remove, add, and replace operations are generated.

??? example

The following code shows how a JSON patch is created as a diff for two JSON values.
 
```cpp
--8<-- "examples/diff.cpp"
```

Output:

```json
--8<-- "examples/diff.output"
```

• RFC 6902 (JSON Patch)

• Added in version 2.0.0.