JSON for Modern C++ 2.0.10

allocator_type
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at
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basic_json
basic_json
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basic_json
basic_json
basic_json
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basic_json
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~basic_json
| ## § basic_json() [6/23] 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 = std::int64_t, class NumberUnsignedType = std::uint64_t, class NumberFloatType = double, template< typename U > class AllocatorType = std::allocator> template<class CompatibleArrayType , typename std::enable_if< not std::is_same< CompatibleArrayType, typename basic_json_t::iterator >::value and not std::is_same< CompatibleArrayType, typename basic_json_t::const_iterator >::value and not std::is_same< CompatibleArrayType, typename basic_json_t::reverse_iterator >::value and not std::is_same< CompatibleArrayType, typename basic_json_t::const_reverse_iterator >::value and not std::is_same< CompatibleArrayType, typename array_t::iterator >::value and not std::is_same< CompatibleArrayType, typename array_t::const_iterator >::value and std::is_constructible< basic_json, typename CompatibleArrayType::value_type >::value, int >::type = 0>
nlohmann::basic_json::basic_json | ( | const CompatibleArrayType & | val | ) |
| inline
  Create an array JSON value with a given content. This constructor allows any type CompatibleArrayType that can be used to construct values of type array_t. Template Parameters
  CompatibleArrayType | An object type whose `value_type` is compatible to array_t. Examples include `std::vector`, `std::deque`, `std::list`, `std::forward_list`, `std::array`, `std::set`, `std::unordered_set`, `std::multiset`, and `unordered_multiset` with a `value_type` from which a basic_json value can be constructed.
  Parameters
  [in] | val | a value for the array
  Complexity Linear in the size of the passed val. Exceptions
  std::bad_alloc | if allocation for array value fails
  Example The following code shows the constructor with several compatible array type parameters. 1 #include <json.hpp> 2 #include <deque> 3 #include <list> 4 #include <forward_list> 5 #include <set> 6 #include <unordered_set> 7 8 using json = nlohmann::json; 9 10 int main() 11 { 12 // create an array from std::vector 13 std::vector<int> c_vector {1, 2, 3, 4}; 14 json j_vec(c_vector); 15 16 // create an array from std::deque 17 std::deque<double> c_deque {1.2, 2.3, 3.4, 5.6}; 18 json j_deque(c_deque); 19 20 // create an array from std::list 21 std::list<bool> c_list {true, true, false, true}; 22 json j_list(c_list); 23 24 // create an array from std::forward_list 25 std::forward_list<int64_t> c_flist {12345678909876, 23456789098765, 34567890987654, 45678909876543}; 26 json j_flist(c_flist); 27 28 // create an array from std::array 29 std::array<unsigned long, 4> c_array {{1, 2, 3, 4}}; 30 json j_array(c_array); 31 32 // create an array from std::set 33 std::set<std::string> c_set {"one", "two", "three", "four", "one"}; 34 json j_set(c_set); // only one entry for "one" is used 35 36 // create an array from std::unordered_set 37 std::unordered_set<std::string> c_uset {"one", "two", "three", "four", "one"}; 38 json j_uset(c_uset); // only one entry for "one" is used 39 40 // create an array from std::multiset 41 std::multiset<std::string> c_mset {"one", "two", "one", "four"}; 42 json j_mset(c_mset); // both entries for "one" are used 43 44 // create an array from std::unordered_multiset 45 std::unordered_multiset<std::string> c_umset {"one", "two", "one", "four"}; 46 json j_umset(c_umset); // both entries for "one" are used 47 48 // serialize the JSON arrays 49 std::cout << j_vec << '\n'; 50 std::cout << j_deque << '\n'; 51 std::cout << j_list << '\n'; 52 std::cout << j_flist << '\n'; 53 std::cout << j_array << '\n'; 54 std::cout << j_set << '\n'; 55 std::cout << j_uset << '\n'; 56 std::cout << j_mset << '\n'; 57 std::cout << j_umset << '\n'; 58 } nlohmann::json basic_json<> json default JSON class Definition: json.hpp:12151 Output (play with this example online):
      [1,2,3,4]
      [1.2,2.3,3.4,5.6]
      [true,true,false,true]
      [12345678909876,23456789098765,34567890987654,45678909876543]
      [1,2,3,4]
      ["four","one","three","two"]
      ["four","three","two","one"]
      ["four","one","one","two"]
      ["four","two","one","one"]
  The example code above can be translated with
      g++ -std=c++11 -Isrc doc/examples/basic_json__CompatibleArrayType.cpp -o basic_json__CompatibleArrayType
See also basic_json(const array_t&) – create an array value Since version 1.0.0 Definition at line 1222 of file json.hpp.