JSON for Modern C++ 2.0.10

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_iterator
const_pointer
const_reference
const_reverse_iterator
count
crbegin
crend
diff
difference_type
dump
emplace
emplace_back
empty
end
end
erase
erase
erase
erase
find
find
flatten
from_cbor
from_msgpack
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
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+=
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operator<
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operator[]
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operator[]
operator[]
operator[]
operator[]
parse
parse
parse
parse
parse
parse
parse_event_t
parser_callback_t
patch
pointer
push_back
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push_back
push_back
rbegin
rbegin
reference
rend
rend
reverse_iterator
size
size_type
string_t
swap
swap
swap
swap
to_cbor
to_msgpack
type
unflatten
value
value
value
value
value_t
value_type
~basic_json
| ## § flatten() 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::flatten | ( |  | ) | const
| inline
  The function creates a JSON object whose keys are JSON pointers (see RFC 6901) and whose values are all primitive. The original JSON value can be restored using the unflatten() function. Returns an object that maps JSON pointers to primitve values Note Empty objects and arrays are flattened to `null` and will not be reconstructed correctly by the unflatten() function. Complexity Linear in the size the JSON value. Example The following code shows how a JSON object is flattened to an object whose keys consist of JSON pointers. 1 #include <json.hpp> 2 3 using json = nlohmann::json; 4 5 int main() 6 { 7 // create JSON value 8 json j = 9 { 10 {"pi", 3.141}, 11 {"happy", true}, 12 {"name", "Niels"}, 13 {"nothing", nullptr}, 14 { 15 "answer", { 16 {"everything", 42} 17 } 18 }, 19 {"list", {1, 0, 2}}, 20 { 21 "object", { 22 {"currency", "USD"}, 23 {"value", 42.99} 24 } 25 } 26 }; 27 28 // call flatten() 29 std::cout << std::setw(4) << j.flatten() << '\n'; 30 } nlohmann::json basic_json<> json default JSON class Definition: json.hpp:12151 Output (play with this example online):
      {
          "/answer/everything": 42,
          "/happy": true,
          "/list/0": 1,
          "/list/1": 0,
          "/list/2": 2,
          "/name": "Niels",
          "/nothing": null,
          "/object/currency": "USD",
          "/object/value": 42.99,
          "/pi": 3.141
      }
  The example code above can be translated with
      g++ -std=c++11 -Isrc doc/examples/flatten.cpp -o flatten
See also unflatten() for the reverse function Since version 2.0.0 Definition at line 11626 of file json.hpp.