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> template<typename T , std::size_t n>
const_reference nlohmann::basic_json::operator[] | ( | T *(&) | key[n] | ) | const
| inline
  Returns a const reference to the element at with specified key key. No bounds checking is performed. Warning If the element with key key does not exist, the behavior is undefined. Note This function is required for compatibility reasons with Clang. Parameters
  [in] | key | key of the element to access
  Returns const reference to the element at key key Exceptions
  std::domain_error | if JSON is not an object; 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 using the [] operator. 1 #include <json.hpp> 2 3 using namespace nlohmann; 4 5 int main() 6 { 7 // create a JSON object 8 const 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:191 nlohmann namespace for Niels Lohmann Definition: json.hpp:88 Output (play with this example online):
      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
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 3128 of file json.hpp.