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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>
static basic_json nlohmann::basic_json::array | ( | list_init_t | init = `list_init_t()` | ) |
| inline static
  Creates a JSON array value from a given initializer list. That is, given a list of values `a, b, c`, creates the JSON value `[a, b, c]`. If the initializer list is empty, the empty array `[]` is created. Note This function is only needed to express two edge cases that cannot be realized with the initializer list constructor (basic_json(list_init_t, bool, value_t)). These cases are: creating an array whose elements are all pairs whose first element is a string - in this case, the initializer list constructor would create an object, taking the first elements as keys creating an empty array - passing the empty initializer list to the initializer list constructor yields an empty object Parameters
  [in] | init | initializer list with JSON values to create an array from (optional)
  Returns JSON array value Complexity Linear in the size of init. Example The following code shows an example for the array function. 1 #include <json.hpp> 2 3 using namespace nlohmann; 4 5 int main() 6 { 7 // create JSON arrays 8 json j_no_init_list = json::array(); 9 json j_empty_init_list = json::array({}); 10 json j_nonempty_init_list = json::array({1, 2, 3, 4}); 11 json j_list_of_pairs = json::array({ {"one", 1}, {"two", 2} }); 12 13 // serialize the JSON arrays 14 std::cout << j_no_init_list << '\n'; 15 std::cout << j_empty_init_list << '\n'; 16 std::cout << j_nonempty_init_list << '\n'; 17 std::cout << j_list_of_pairs << '\n'; 18 } 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::array static basic_json array(list_init_t init=list_init_t()) explicitly create an array from an initializer list Definition: json.hpp:1026 Output:
      []
      []
      [1,2,3,4]
      [["one",1],["two",2]]
  The example code above can be translated with
      g++ -std=c++11 -Isrc doc/examples/array.cpp -o array
. See also basic_json(list_init_t, bool, value_t) - create a JSON value from an initializer list basic_json object(list_init_t) - create a JSON object value from an initializer list