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@@ -69,13 +69,61 @@ function throws an exception.
The following code shows how a JSON patch is applied to a value.
```cpp
--8<-- "examples/patch_inplace.cpp"
#include <iostream>
#include <iomanip>
#include <nlohmann/json.hpp>
using json = nlohmann::json;
using namespace nlohmann::literals;
int main()
{
// the original document
json doc = R"(
{
"baz": "qux",
"foo": "bar"
}
)"_json;
// the patch
json patch = R"(
[
{ "op": "replace", "path": "/baz", "value": "boo" },
{ "op": "add", "path": "/hello", "value": ["world"] },
{ "op": "remove", "path": "/foo"}
]
)"_json;
// output original document
std::cout << "Before\n" << std::setw(4) << doc << std::endl;
// apply the patch
doc.patch_inplace(patch);
// output patched document
std::cout << "\nAfter\n" << std::setw(4) << doc << std::endl;
}
```
Output:
```json
--8<-- "examples/patch_inplace.output"
Before
{
"baz": "qux",
"foo": "bar"
}
After
{
"baz": "boo",
"hello": [
"world"
]
}
```
??? example "Example: out_of_range.403 exception with a partially applied patch"
@@ -85,13 +133,56 @@ function throws an exception.
the exception is caught, unlike [`patch`](patch.md).
```cpp
--8<-- "examples/patch_inplace__exception.cpp"
#include <iostream>
#include <iomanip>
#include <nlohmann/json.hpp>
using json = nlohmann::json;
using namespace nlohmann::literals;
int main()
{
// the original document
json doc = R"(
{
"a": 1,
"b": 2
}
)"_json;
// a patch whose second operation fails
json patch = R"(
[
{ "op": "replace", "path": "/a", "value": 99 },
{ "op": "remove", "path": "/nonexistent" }
]
)"_json;
// exception out_of_range.403
try
{
doc.patch_inplace(patch);
}
catch (const json::out_of_range& e)
{
std::cout << e.what() << '\n';
}
// the first operation has already been applied to doc
std::cout << std::setw(4) << doc << std::endl;
}
```
Output:
```json
--8<-- "examples/patch_inplace__exception.output"
[json.exception.out_of_range.403] key 'nonexistent' not found
{
"a": 99,
"b": 2
}
```
## See also
@@ -110,3 +201,6 @@ function throws an exception.
location has a non-object/non-array parent in version 3.13.0.
- Added [`out_of_range.414`](../../home/exceptions.md#jsonexceptionout_of_range414) and rejected a "move" operation whose "from" location is a proper
prefix of its "path" location instead of silently producing a corrupted result in version 3.13.0.
- Throws [`parse_error.109`](../../home/exceptions.md#jsonexceptionparse_error109) instead of
[`out_of_range.404`](../../home/exceptions.md#jsonexceptionout_of_range404) for a one-character array index that is
not a digit (e.g., `/x`) in version 3.13.0, as it already did for longer ones.