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basic_json
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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>
const_reference nlohmann::basic_json::operator[] | ( | const typename object_t::key_type & | key | ) | const
| inline
  Returns a reference to the element at with specified key key. 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
  Complexity Logarithmic in the size of the container. Example The example below shows how object elements can be read 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'; 15 } nlohmann::basic_json a class to store JSON values Definition: json.hpp:121 nlohmann namespace for Niels Lohmann Definition: json.hpp:56 Output:
      2
  The example code above can be translated with
      g++ -std=c++11 -Isrc doc/examples/operatorarray__key_type_const.cpp -o operatorarray__key_type_const
.