JSON for Modern C++ 3.7.1

accept
accept
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
begin
begin
boolean_t
cbegin
cend
clear
const_iterator
const_pointer
const_reference
const_reverse_iterator
contains
contains
count
crbegin
crend
detail::external_constructor
diff
difference_type
dump
emplace
emplace_back
empty
end
end
erase
erase
erase
erase
error_handler_t
exception
find
find
flatten
from_bson
from_bson
from_cbor
from_cbor
from_msgpack
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from_ubjson
from_ubjson
front
front
get
get
get
get
get
get
get_allocator
get_ptr
get_ptr
get_ref
get_ref
get_to
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initializer_list_t
input_format_t
insert
insert
insert
insert
insert
insert
insert_iterator
invalid_iterator
is_array
is_boolean
is_discarded
is_null
is_number
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is_number_integer
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items
items
iterator
iterator_wrapper
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json_pointer
json_sax_t
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max_size
merge_patch
meta
number_float_t
number_integer_t
number_unsigned_t
object
object_comparator_t
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operator value_t
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operator!=
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operator+=
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operator<
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operator>>
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operator[]
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operator[]
operator[]
operator[]
operator[]
operator[]
other_error
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parse
parse
parse_error
parse_event_t
parser_callback_t
patch
pointer
push_back
push_back
push_back
push_back
rbegin
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reference
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rend
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sax_parse
sax_parse
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size_type
string_t
swap
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swap
to_bson
to_bson
to_bson
to_cbor
to_cbor
to_cbor
to_msgpack
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to_ubjson
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to_ubjson
type
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~basic_json
| ## ◆ push_back() [2/4] 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, template< typename T, typename SFINAE=void > class JSONSerializer = adl_serializer>
void nlohmann::basic_json::push_back | ( | const basic_json & | val | ) |
| inline
  add an object to an array Appends the given element val to the end of the JSON value. If the function is called on a JSON null value, an empty array is created before appending val. Parameters
  [in] | val | the value to add to the JSON array
  Exceptions
  type_error.308 | when called on a type other than JSON array or null; example: `"cannot use push_back() with number"`
  Complexity Amortized constant. Example The example shows how `push_back()` and `+=` can be used to add elements to a JSON array. Note how the `null` value was silently converted to a JSON array. 1 #include <iostream> 2 #include <nlohmann/json.hpp> 3 4 using json = nlohmann::json; 5 6 int main() 7 { 8 // create JSON values 9 json array = {1, 2, 3, 4, 5}; 10 json null; 11 12 // print values 13 std::cout << array << '\n'; 14 std::cout << null << '\n'; 15 16 // add values 17 array.push_back(6); 18 array += 7; 19 null += "first"; 20 null += "second"; 21 22 // print values 23 std::cout << array << '\n'; 24 std::cout << null << '\n'; 25 } Output (play with this example online):
      [1,2,3,4,5]
      null
      [1,2,3,4,5,6,7]
      ["first","second"]
  The example code above can be translated with
      g++ -std=c++11 -Isingle_include doc/examples/push_back.cpp -o push_back
Since version 1.0.0 Definition at line 19406 of file json.hpp.

nlohmann::basic_json::array
static basic_json array(initializer_list_t init={})
explicitly create an array from an initializer list
Definition: json.hpp:16042
nlohmann::basic_json::push_back
void push_back(basic_json &&val)
add an object to an array
Definition: json.hpp:19369
nlohmann::json
basic_json<> json
default JSON class
Definition: json.hpp:2445