JSON for Modern C++ 3.8.0

accept
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basic_json
basic_json
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basic_json
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basic_json
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update
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~basic_json
| ## ◆ update() [1/2]
void nlohmann::basic_json::update | ( | const_iterator | first,
|  | const_iterator | last
| ) |  |
| inline
  Inserts all values from from range `[first, last)` and overwrites existing keys. Parameters
  [in] | first | begin of the range of elements to insert
  [in] | last | end of the range of elements to insert
  Exceptions
  type_error.312 | if called on JSON values other than objects; example: `"cannot use update() with string"`
  invalid_iterator.202 | if iterator first or last does does not point to an object; example: `"iterators first and last must point to objects"`
  invalid_iterator.210 | if first and last do not belong to the same JSON value; example: `"iterators do not fit"`
  Complexity O(N*log(size() + N)), where N is the number of elements to insert. Example The example shows how `update()` is used__range. 1 #include <iostream> 2 #include <iomanip> 3 #include <nlohmann/json.hpp> 4 5 using json = nlohmann::json; 6 7 int main() 8 { 9 // create two JSON objects 10 json o1 = R"( {"color": "red", "price": 17.99} )"_json; 11 json o2 = R"( {"color": "blue", "speed": 100} )"_json; 12 13 // add all keys from o2 to o1 (updating "color") 14 o1.update(o2); 15 16 // output updated object o1 17 std::cout << std::setw(2) << o1 << '\n'; 18 } Output (play with this example online):
      {
        "color": "blue",
        "price": 17.99,
        "speed": 100
      }
  The example code above can be translated with
      g++ -std=c++11 -Isingle_include doc/examples/update.cpp -o update
See also https://docs.python.org/3.6/library/stdtypes.html#dict.update Since version 3.0.0 Definition at line 22218 of file json.hpp.

nlohmann::json
basic_json<> json
default JSON class
Definition: json.hpp:2933