JSON Patch (RFC 6902) defines a JSON document structure for expressing a sequence
of operations to apply to a JSON document. With the patch function, a JSON Patch is applied to the current JSON value
by executing all operations from the patch.
??? example
The following code shows how a JSON patch is applied to a value.
```cpp
--8<-- "examples/patch.cpp"
```
Output:
```json
--8<-- "examples/patch.output"
```
The library can also calculate a JSON patch (i.e., a diff) given two JSON values.
!!! success "Invariant"
For two JSON values *source* and *target*, the following code yields always true:
```cüü
source.patch(diff(source, target)) == target;
```
??? 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"
```