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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>
nlohmann::basic_json::basic_json | ( |  | ) |
| default noexcept
  Create a `null` JSON value. This is the implicit version of the `null` value constructor as it takes no parameters. Complexity Constant. Requirements This function satisfies the Container requirements: The complexity is constant. As postcondition, it holds: `basic_json().empty() == true`. Example The following code shows the constructor for a `null` JSON value. 1 #include <json.hpp> 2 3 using namespace nlohmann; 4 5 int main() 6 { 7 // create a JSON value with default null value 8 json j; 9 10 // serialize the JSON null value 11 std::cout << j << '\n'; 12 } nlohmann::basic_json a class to store JSON values Definition: json.hpp:130 nlohmann namespace for Niels Lohmann Definition: json.hpp:55 Output (play with this example online):
      null
  The example code above can be translated with
      g++ -std=c++11 -Isrc doc/examples/basic_json.cpp -o basic_json
See also basic_json(std::nullptr_t)