allocator_type
array
array_t
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
begin
begin
boolean_t
cbegin
cend
clear
const_pointer
const_reference
count
crbegin
crend
difference_type
dump
empty
end
end
erase
erase
erase
erase
find
find
front
front
get
get
get
get_allocator
get_ptr
get_ptr
is_array
is_boolean
is_discarded
is_null
is_number
is_number_float
is_number_integer
is_object
is_primitive
is_string
is_structured
max_size
number_float_t
number_integer_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[]
parse
parse
parse_event_t
parser_callback_t
pointer
push_back
push_back
push_back
rbegin
rbegin
reference
rend
rend
size
size_type
string_t
swap
swap
swap
swap
type
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 = int64_t, class NumberFloatType = double, template< typename U > class AllocatorType = std::allocator>

size_type nlohmann::basic_json::max_size | ( |  | ) | const

inlinenoexcept

Returns the maximum number of elements a JSON value is able to hold due to system or library implementation limitations, i.e. `std::distance(begin(), end())` for the JSON value.

Returns
  The return value depends on the different types and is defined as follows:

  Value type | return value
  --- | ---
  null | `0` (same as size())
  boolean | `1` (same as size())
  string | `1` (same as size())
  number | `1` (same as size())
  object | result of function object_t::max_size()
  array | result of function array_t::max_size()

Complexity
  Constant, as long as array_t and object_t satisfy the Container concept; that is, their max_size() functions have constant complexity.

Requirements
  This function satisfies the Container requirements:
  - The complexity is constant.
  - Has the semantics of returning `b.size()` where `b` is the largest possible JSON value.

Example
  The following code calls max_size on the different value types. Note the output is implementation specific.
  #include <json.hpp>
  using namespace nlohmann;
  int main()
  {
  // create JSON values
  json j_null;
  json j_boolean = true;
  json j_number_integer = 17;
  json j_number_float = 23.42;
  json j_object = {{"one", 1}, {"two", 2}};
  json j_array = {1, 2, 4, 8, 16};
  json j_string = "Hello, world";
  // call max_size()
  std::cout << j_null.max_size() << '\n';
  std::cout << j_boolean.max_size() << '\n';
  std::cout << j_number_integer.max_size() << '\n';
  std::cout << j_number_float.max_size() << '\n';
  std::cout << j_object.max_size() << '\n';
  std::cout << j_array.max_size() << '\n';
  std::cout << j_string.max_size() << '\n';
  }
  nlohmann::basic_json
  a class to store JSON values
  Definition: json.hpp:130
  nlohmann
  namespace for Niels Lohmann
  Definition: json.hpp:55
  nlohmann::basic_json::max_size
  size_type max_size() const noexcept
  returns the maximum possible number of elements
  Definition: json.hpp:3495
  Output (play with this example online):

      0
      1
      1
      1
      256204778801521550
      1152921504606846975
      1

  The example code above can be translated with

      g++ -std=c++11 -Isrc doc/examples/max_size.cpp -o max_size