JSON for Modern C++ 2.0.3

- Main Page
- Related Pages
- Classes

allocator_type
array
array_t
at
at
at
at
at
at
back
back
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
begin
begin
boolean_t
cbegin
cend
clear
const_pointer
const_reference
const_reverse_iterator
count
crbegin
crend
diff
difference_type
dump
empty
end
end
erase
erase
erase
erase
find
find
flatten
front
front
get
get
get
get_allocator
get_ptr
get_ptr
get_ref
get_ref
insert
insert
insert
insert
insert
is_array
is_boolean
is_discarded
is_null
is_number
is_number_float
is_number_integer
is_number_unsigned
is_object
is_primitive
is_string
is_structured
iterator_wrapper
iterator_wrapper
max_size
number_float_t
number_integer_t
number_unsigned_t
object
object_t
operator value_t
operator ValueType
operator!=
operator!=
operator!=
operator+=
operator+=
operator+=
operator+=
operator<
operator<
operator<<
operator<<
operator<=
operator=
operator==
operator==
operator==
operator>
operator>=
operator>>
operator>>
operator[]
operator[]
operator[]
operator[]
operator[]
operator[]
operator[]
operator[]
operator[]
operator[]
parse
parse
parse
parse
parse
parse
parse_event_t
parser_callback_t
patch
pointer
push_back
push_back
push_back
push_back
rbegin
rbegin
reference
rend
rend
reverse_iterator
size
size_type
string_t
swap
swap
swap
swap
type
unflatten
value
value
value
value
value_t
value_type
~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>
basic_json nlohmann::basic_json::unflatten | ( |  | ) | const
| inline
  The function restores the arbitrary nesting of a JSON value that has been flattened before using the flatten() function. The JSON value must meet certain constraints: The value must be an object. The keys must be JSON pointers (see RFC 6901) The mapped values must be primitive JSON types. Returns the original JSON from a flattened version Note Empty objects and arrays are flattened by flatten() to `null` values and can not unflattened to their original type. Apart from this example, for a JSON value `j`, the following is always true: `j == j.flatten().unflatten()`. Complexity Linear in the size the JSON value. Example The following code shows how a flattened JSON object is unflattened into the original nested JSON object. 1 #include <json.hpp> 2 3 using json = nlohmann::json; 4 5 int main() 6 { 7 // create JSON value 8 json j_flattened = 9 { 10 {"/answer/everything", 42}, 11 {"/happy", true}, 12 {"/list/0", 1}, 13 {"/list/1", 0}, 14 {"/list/2", 2}, 15 {"/name", "Niels"}, 16 {"/nothing", nullptr}, 17 {"/object/currency", "USD"}, 18 {"/object/value", 42.99}, 19 {"/pi", 3.141} 20 }; 21 22 // call unflatten() 23 std::cout << std::setw(4) << j_flattened.unflatten() << '\n'; 24 } nlohmann::json basic_json<> json default JSON class Definition: json.hpp:10512 Output (play with this example online):
      {
          "answer": {
              "everything": 42
          },
          "happy": true,
          "list": [
              1,
              0,
              2
          ],
          "name": "Niels",
          "nothing": null,
          "object": {
              "currency": "USD",
              "value": 42.99
          },
          "pi": 3.141
      }
  The example code above can be translated with
      g++ -std=c++11 -Isrc doc/examples/unflatten.cpp -o unflatten
See also flatten() for the reverse function Since version 2.0.0 Definition at line 10021 of file json.hpp.