JSON for Modern C++ 2.1.1

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
begin
begin
boolean_t
cbegin
cend
clear
const_iterator
const_pointer
const_reference
const_reverse_iterator
count
crbegin
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detail::external_constructor
diff
difference_type
dump
emplace
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empty
end
end
erase
erase
erase
erase
exception
find
find
flatten
from_cbor
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front
front
get
get
get
get
get
get_allocator
get_ptr
get_ptr
get_ref
get_ref
insert
insert
insert
insert
insert
insert
invalid_iterator
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
json_serializer
max_size
meta
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[]
operator[]
operator[]
operator[]
operator[]
operator[]
operator[]
operator[]
other_error
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parse
parse
parse
parse
parse
parse
parse_error
parse_event_t
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patch
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push_back
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push_back
rbegin
rbegin
reference
rend
rend
reverse_iterator
size
size_type
string_t
swap
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swap
swap
to_cbor
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type
type_error
type_name
unflatten
value
value
value
value
value_t
value_type
~basic_json
| ## ◆ operator[]() [1/10] 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>
reference nlohmann::basic_json::operator[] | ( | size_type | idx | ) |
| inline
  Returns a reference to the element at specified location idx. Note If idx is beyond the range of the array (i.e., `idx >= size()`), then the array is silently filled up with `null` values to make `idx` a valid reference to the last stored element. Parameters
  [in] | idx | index of the element to access
  Returns reference to the element at index idx Exceptions
  type_error.305 | if the JSON value is not an array or null; in that cases, using the [] operator with an index makes no sense.
  Complexity Constant if idx is in the range of the array. Otherwise linear in `idx - size()`. Example The example below shows how array elements can be read and written using `[]` operator. Note the addition of `null` values. 1 #include "json.hpp" 2 3 using json = nlohmann::json; 4 5 int main() 6 { 7 // create a JSON array 8 json array = {1, 2, 3, 4, 5}; 9 10 // output element at index 3 (fourth element) 11 std::cout << array[3] << '\n'; 12 13 // change last element to 6 14 array[array.size() - 1] = 6; 15 16 // output changed array 17 std::cout << array << '\n'; 18 19 // write beyond array limit 20 array[10] = 11; 21 22 // output changed array 23 std::cout << array << '\n'; 24 } nlohmann::json basic_json<> json default JSON class Definition: json.hpp:13933 Output (play with this example online):
      4
      [1,2,3,4,6]
      [1,2,3,4,6,null,null,null,null,null,11]
  The example code above can be translated with
      g++ -std=c++11 -Isrc doc/examples/operatorarray__size_type.cpp -o operatorarray__size_type
Since version 1.0.0 Definition at line 3983 of file json.hpp.