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 ReferenceType , typename std::enable_if< std::is_reference< ReferenceType >::value , int >::type = 0>
ReferenceType nlohmann::basic_json::get_ref | ( |  | ) |
| inline
  Implict reference access to the internally stored JSON value. No copies are made. Warning Writing data to the referee of the result yields an undefined state. Template Parameters
  ReferenceType | reference type; must be a reference to array_t, object_t, string_t, boolean_t, number_integer_t, or number_float_t.
  Returns reference to the internally stored JSON value if the requested reference type ReferenceType fits to the JSON value; throws std::domain_error otherwise Exceptions
  std::domain_error | in case passed type ReferenceType is incompatible with the stored JSON value
  Complexity Constant. Example The example shows several calls to `get_ref()`. 1 #include <json.hpp> 2 3 using namespace nlohmann; 4 5 int main() 6 { 7 // create a JSON number 8 json value = 17; 9 10 // explicitly getting references 11 auto r1 = value.get_ref<const json::number_integer_t&>(); 12 auto r2 = value.get_ref<json::number_integer_t&>(); 13 14 // print the values 15 std::cout << r1 << ' ' << r2 << '\n'; 16 17 // incompatible type throws exception 18 try 19 { 20 auto r3 = value.get_ref<json::number_float_t&>(); 21 } 22 catch (std::domain_error& ex) 23 { 24 std::cout << ex.what() << '\n'; 25 } 26 } nlohmann::basic_json a class to store JSON values Definition: json.hpp:191 nlohmann::basic_json::get_ref ReferenceType get_ref() get a reference value (implicit) Definition: json.hpp:2634 nlohmann namespace for Niels Lohmann Definition: json.hpp:88 nlohmann::basic_json::number_integer_t NumberIntegerType number_integer_t a type for a number (integer) Definition: json.hpp:537 nlohmann::basic_json::number_float_t NumberFloatType number_float_t a type for a number (floating-point) Definition: json.hpp:602 Output (play with this example online):
      17 17
      incompatible ReferenceType for get_ref, actual type is number
  The example code above can be translated with
      g++ -std=c++11 -Isrc doc/examples/get_ref.cpp -o get_ref
Since version 1.1.0 Definition at line 2634 of file json.hpp.