JSON for Modern C++ 2.0.3

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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 = std::int64_t, class NumberUnsignedType = std::uint64_t, class NumberFloatType = double, template< typename U > class AllocatorType = std::allocator>
const_reference nlohmann::basic_json::operator[] | ( | const json_pointer & | ptr | ) | const
| inline
  Uses a JSON pointer to retrieve a reference to the respective JSON value. No bound checking is performed. The function does not change the JSON value; no `null` values are created. In particular, the the special value `-` yields an exception. Parameters
  [in] | ptr | JSON pointer to the desired element
  Returns const reference to the element pointed to by ptr Complexity Constant. Exceptions
  std::out_of_range | if the JSON pointer can not be resolved
  std::domain_error | if an array index begins with '0'
  std::invalid_argument | if an array index was not a number
  Example The behavior is shown in the example. 1 #include <json.hpp> 2 3 using json = nlohmann::json; 4 5 int main() 6 { 7 // create a JSON value 8 const json j = 9 { 10 {"number", 1}, {"string", "foo"}, {"array", {1, 2}} 11 }; 12 13 // read-only access 14 15 // output element with JSON pointer "/number" 16 std::cout << j["/number"_json_pointer] << '\n'; 17 // output element with JSON pointer "/string" 18 std::cout << j["/string"_json_pointer] << '\n'; 19 // output element with JSON pointer "/array" 20 std::cout << j["/array"_json_pointer] << '\n'; 21 // output element with JSON pointer "/array/1" 22 std::cout << j["/array/1"_json_pointer] << '\n'; 23 } nlohmann::json basic_json<> json default JSON class Definition: json.hpp:10512 Output (play with this example online):
      1
      "foo"
      [1,2]
      2
  The example code above can be translated with
      g++ -std=c++11 -Isrc doc/examples/operatorjson_pointer_const.cpp -o operatorjson_pointer_const
Since version 2.0.0 Definition at line 9910 of file json.hpp.