JSON for Modern C++ 1.1.0

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~basic_json
| 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 = int64_t, class NumberFloatType = double, template< typename U > class AllocatorType = std::allocator>
reference nlohmann::basic_json::operator[] | ( | const typename object_t::key_type & | key | ) |
| inline
  Returns a reference to the element at with specified key key. Note If key is not found in the object, then it is silently added to the object and filled with a `null` value to make `key` a valid reference. In case the value was `null` before, it is converted to an object. Parameters
  [in] | key | key of the element to access
  Returns reference to the element at key key Exceptions
  std::domain_error | if JSON is not an object or null; example: `"cannot use operator[] with null"`
  Complexity Logarithmic in the size of the container. Example The example below shows how object elements can be read and written using the [] operator. 1 #include <json.hpp> 2 3 using namespace nlohmann; 4 5 int main() 6 { 7 // create a JSON object 8 json object = 9 { 10 {"one", 1}, {"two", 2}, {"three", 2.9} 11 }; 12 13 // output element with key "two" 14 std::cout << object["two"] << "\n\n"; 15 16 // change element with key "three" 17 object["three"] = 3; 18 19 // output changed array 20 std::cout << std::setw(4) << object << "\n\n"; 21 22 // mention nonexisting key 23 object["four"]; 24 25 // write to nonexisting key 26 object["five"]["really"]["nested"] = true; 27 28 // output changed object 29 std::cout << std::setw(4) << object << '\n'; 30 } nlohmann::basic_json a class to store JSON values Definition: json.hpp:191 nlohmann namespace for Niels Lohmann Definition: json.hpp:88 Output (play with this example online):
      2

      {
          "one": 1,
          "three": 3,
          "two": 2
      }

      {
          "five": {
              "really": {
                  "nested": true
              }
          },
          "four": null,
          "one": 1,
          "three": 3,
          "two": 2
      }
  The example code above can be translated with
      g++ -std=c++11 -Isrc doc/examples/operatorarray__key_type.cpp -o operatorarray__key_type
See also at(const typename object_t::key_type&) for access by reference with range checking value() for access by value with a default value Since version 1.0.0 Definition at line 3002 of file json.hpp.