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~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
| inline noexcept
  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`
  boolean | `1`
  string | `1`
  number | `1`
  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. 1 #include <json.hpp> 2 3 using namespace nlohmann; 4 5 int main() 6 { 7 // create JSON values 8 json j_null; 9 json j_boolean = true; 10 json j_number_integer = 17; 11 json j_number_float = 23.42; 12 json j_object = {{"one", 1}, {"two", 2}}; 13 json j_array = {1, 2, 4, 8, 16}; 14 json j_string = "Hello, world"; 15 16 // call max_size() 17 std::cout << j_null.max_size() << '\n'; 18 std::cout << j_boolean.max_size() << '\n'; 19 std::cout << j_number_integer.max_size() << '\n'; 20 std::cout << j_number_float.max_size() << '\n'; 21 std::cout << j_object.max_size() << '\n'; 22 std::cout << j_array.max_size() << '\n'; 23 std::cout << j_string.max_size() << '\n'; 24 } nlohmann::basic_json a class to store JSON values Definition: json.hpp:121 nlohmann namespace for Niels Lohmann Definition: json.hpp:56 nlohmann::basic_json::max_size size_type max_size() const noexcept returns the maximum possible number of elements Definition: json.hpp:3022 Output:
      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
.