JSON for Modern C++ 2.0.10

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basic_json
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~basic_json
| ## § patch() template<template< typename U, typename V, typename... Args > class ObjectType = std::map, template< typename U, typename... Args > class ArrayType = std::vector, class StringType = std::string, class BooleanType = bool, class NumberIntegerType = std::int64_t, class NumberUnsignedType = std::uint64_t, class NumberFloatType = double, template< typename U > class AllocatorType = std::allocator>
basic_json nlohmann::basic_json::patch | ( | const basic_json & | json_patch | ) | const
| inline
  JSON Patch defines a JSON document structure for expressing a sequence of operations to apply to a JSON) document. With this funcion, a JSON Patch is applied to the current JSON value by executing all operations from the patch. Parameters
  [in] | json_patch | JSON patch document
  Returns patched document Note The application of a patch is atomic: Either all operations succeed and the patched document is returned or an exception is thrown. In any case, the original value is not changed: the patch is applied to a copy of the value. Exceptions
  std::out_of_range | if a JSON pointer inside the patch could not be resolved successfully in the current JSON value; example: `"key baz not found"`
  invalid_argument | if the JSON patch is malformed (e.g., mandatory attributes are missing); example: `"operation add must have member path"`
  Complexity Linear in the size of the JSON value and the length of the JSON patch. As usually only a fraction of the JSON value is affected by the patch, the complexity can usually be neglected. Example The following code shows how a JSON patch is applied to a value. 1 #include <json.hpp> 2 3 using json = nlohmann::json; 4 5 int main() 6 { 7 // the original document 8 json doc = R"( 9 { 10 "baz": "qux", 11 "foo": "bar" 12 } 13 )"_json; 14 15 // the patch 16 json patch = R"( 17 [ 18 { "op": "replace", "path": "/baz", "value": "boo" }, 19 { "op": "add", "path": "/hello", "value": ["world"] }, 20 { "op": "remove", "path": "/foo"} 21 ] 22 )"_json; 23 24 // apply the patch 25 json patched_doc = doc.patch(patch); 26 27 // output original and patched document 28 std::cout << std::setw(4) << doc << "\n\n" 29 << std::setw(4) << patched_doc << std::endl; 30 } nlohmann::json basic_json<> json default JSON class Definition: json.hpp:12151 Output (play with this example online):
      {
          "baz": "qux",
          "foo": "bar"
      }

      {
          "baz": "boo",
          "hello": [
              "world"
          ]
      }
  The example code above can be translated with
      g++ -std=c++11 -Isrc doc/examples/patch.cpp -o patch
See also diff – create a JSON patch by comparing two JSON values RFC 6902 (JSON Patch) RFC 6901 (JSON Pointer) Since version 2.0.0 Definition at line 11710 of file json.hpp.