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nlohmann
2026-10-03 05:43:12 +00:00
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@@ -22,10 +22,24 @@ No guarantees, value may be corrupted by an unsuccessful patch operation.
- Throws [`parse_error.104`](../../home/exceptions.md#jsonexceptionparse_error104) if the JSON patch does not consist of
an array of objects.
- Throws [`parse_error.105`](../../home/exceptions.md#jsonexceptionparse_error105) if the JSON patch is malformed (e.g.,
mandatory attributes are missing); example: `"operation add must have member path"`.
mandatory attributes are missing); example: `"operation 'add' must have member 'path'"`.
- Throws [`out_of_range.401`](../../home/exceptions.md#jsonexceptionout_of_range401) if an array index is out of range.
- Throws [`parse_error.106`](../../home/exceptions.md#jsonexceptionparse_error106) if an array index in a "path" or
"from" member begins with '0'; example: `"array index '01' must not begin with '0'"`.
- Throws [`parse_error.107`](../../home/exceptions.md#jsonexceptionparse_error107) if a "path" or "from" member is not
empty and does not begin with a slash (`/`); example: `"JSON pointer must be empty or begin with '/' - was: 'a'"`.
- Throws [`parse_error.108`](../../home/exceptions.md#jsonexceptionparse_error108) if a tilde (`~`) in a "path" or
"from" member is not followed by `0` or `1`; example: `"escape character '~' must be followed with '0' or '1'"`.
- Throws [`parse_error.109`](../../home/exceptions.md#jsonexceptionparse_error109) if an array index in a "path" or
"from" member is not a number; example: `"array index 'foo' is not a number"`.
- Throws [`out_of_range.402`](../../home/exceptions.md#jsonexceptionout_of_range402) if the array index `-` is used
where an existing element is required (the "path" of "replace", the "from" of "move" and "copy"); example:
`"array index '-' (3) is out of range"`.
- Throws [`out_of_range.403`](../../home/exceptions.md#jsonexceptionout_of_range403) if a JSON pointer inside the patch
could not be resolved successfully in the current JSON value; example: `"key baz not found"`.
- Throws [`out_of_range.404`](../../home/exceptions.md#jsonexceptionout_of_range404) if a reference token of a JSON
pointer inside the patch cannot be resolved, e.g., `-` in a "remove" operation or `1a` for an array; example:
`"unresolved reference token '-'"`.
- Throws [`out_of_range.405`](../../home/exceptions.md#jsonexceptionout_of_range405) if JSON pointer has no parent
("add", "remove", "move")
- Throws [`out_of_range.411`](../../home/exceptions.md#jsonexceptionout_of_range411) if an "add" operation's target
@@ -50,7 +64,7 @@ function throws an exception.
## Examples
??? example
??? example "Example: apply a JSON patch in place"
The following code shows how a JSON patch is applied to a value.
@@ -64,6 +78,22 @@ function throws an exception.
--8<-- "examples/patch_inplace.output"
```
??? example "Example: out_of_range.403 exception with a partially applied patch"
The following code shows a patch whose first operation succeeds and whose second operation fails. Because
`patch_inplace` applies each operation directly to the value, the first operation's effect is still visible after
the exception is caught, unlike [`patch`](patch.md).
```cpp
--8<-- "examples/patch_inplace__exception.cpp"
```
Output:
```json
--8<-- "examples/patch_inplace__exception.output"
```
## See also
- [RFC 6902 (JSON Patch)](https://tools.ietf.org/html/rfc6902)