JSON for Modern C++ 3.0

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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>
std::istream& operator<< | ( | basic_json & | j,
|  | std::istream & | i
| ) |  |
| friend
  Deserializes an input stream to a JSON value. Parameters
  [in,out] | i | input stream to read a serialized JSON value from
  [in,out] | j | JSON value to write the deserialized input to
  Exceptions
  std::invalid_argument | in case of parse errors
  Complexity Linear in the length of the input. The parser is a predictive LL(1) parser. Example The example below shows how a JSON value is constructed by reading a serialization from a stream. 1 #include <json.hpp> 2 3 using namespace nlohmann; 4 5 int main() 6 { 7 // create stream with serialized JSON 8 std::stringstream ss; 9 ss << R"({ 10 "number": 23, 11 "string": "Hello, world!", 12 "array": [1, 2, 3, 4, 5], 13 "boolean": false, 14 "null": null 15 })"; 16 17 // create JSON value and read the serialization from the stream 18 json j; 19 j << ss; 20 21 // serialize JSON 22 std::cout << std::setw(2) << j << '\n'; 23 } nlohmann::basic_json a class to store JSON values Definition: json.hpp:121 nlohmann namespace for Niels Lohmann Definition: json.hpp:56 Output:
      {
        "array": [
          1,
          2,
          3,
          4,
          5
        ],
        "boolean": false,
        "null": null,
        "number": 23,
        "string": "Hello, world!"
      }
  The example code above can be translated with
      g++ -std=c++11 -Isrc doc/examples/operator_deserialize.cpp -o operator_deserialize
. See also parse(std::istream&, parser_callback_t) for a variant with a parser callback function to filter values while parsing