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 const_reverse_iterator 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 get_ref get_ref insert insert insert insert insert is_array is_boolean is_discarded is_null is_number is_number_float is_number_integer is_object is_primitive is_string is_structured iterator_wrapper iterator_wrapper 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[] operator[] operator[] operator[] operator[] operator[] operator[] parse parse parse parse_event_t parser_callback_t pointer push_back push_back push_back rbegin rbegin reference rend rend reverse_iterator size size_type string_t swap swap swap swap type value value 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> bool operator!= ( const_reference  v, std::nullptr_t    ) friend The functions compares the given JSON value against a null pointer. As the null pointer can be used to initialize a JSON value to null, a comparison of JSON value v with a null pointer should be equivalent to call not v.is_null(). Parameters [in] v JSON value to consider Returns whether v is not null Complexity Constant. Example The example compares several JSON types to the null pointer. #include <json.hpp> using namespace nlohmann; int main() { // create several JSON values json array = {1, 2, 3}; json object = {{"A", "a"}, {"B", "b"}}; json number = 17; json string = "foo"; json null; // output values and comparisons std::cout << std::boolalpha; std::cout << array << " != nullptr " << (array != nullptr) << '\n'; std::cout << object << " != nullptr " << (object != nullptr) << '\n'; std::cout << number << " != nullptr " << (number != nullptr) << '\n'; std::cout << string << " != nullptr " << (string != nullptr) << '\n'; std::cout << null << " != nullptr " << (null != nullptr) << '\n'; } Output (play with this example online): [1,2,3] != nullptr true {"A":"a","B":"b"} != nullptr true 17 != nullptr true "foo" != nullptr true null != nullptr false The example code above can be translated with g++ -std=c++11 -Isrc doc/examples/operator__notequal__nullptr_t.cpp -o operator__notequal__nullptr_t Since version 1.0.0 Definition at line 4951 of file json.hpp.