mirror of
https://github.com/nlohmann/json.git
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212 lines
6.1 KiB
C++
212 lines
6.1 KiB
C++
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#include <json.hpp>
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#include <deque>
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#include <list>
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#include <forward_list>
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#include <set>
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#include <unordered_map>
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#include <unordered_set>
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using json = nlohmann::json;
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int main()
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{
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// ============
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// object types
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// ============
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// create an object from an object_t value
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json::object_t object_value = { {"one", 1}, {"two", 2} };
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json j_object_t(object_value);
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// create an object from std::map
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std::map<std::string, int> c_map
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{
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{"one", 1}, {"two", 2}, {"three", 3}
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};
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json j_map(c_map);
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// create an object from std::unordered_map
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std::unordered_map<const char*, double> c_umap
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{
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{"one", 1.2}, {"two", 2.3}, {"three", 3.4}
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};
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json j_umap(c_umap);
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// create an object from std::multimap
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std::multimap<std::string, bool> c_mmap
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{
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{"one", true}, {"two", true}, {"three", false}, {"three", true}
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};
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json j_mmap(c_mmap); // only one entry for key "three" is used
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// create an object from std::unordered_multimap
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std::unordered_multimap<std::string, bool> c_ummap
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{
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{"one", true}, {"two", true}, {"three", false}, {"three", true}
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};
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json j_ummap(c_ummap); // only one entry for key "three" is used
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// serialize the JSON objects
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std::cout << j_object_t << '\n';
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std::cout << j_map << '\n';
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std::cout << j_umap << '\n';
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std::cout << j_mmap << '\n';
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std::cout << j_ummap << "\n\n";
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// ===========
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// array types
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// ===========
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// create an array from an array_t value
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json::array_t array_value = {"one", "two", 3, 4.5, false};
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json j_array_t(array_value);
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// create an array from std::vector
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std::vector<int> c_vector {1, 2, 3, 4};
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json j_vec(c_vector);
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// create an array from std::deque
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std::deque<double> c_deque {1.2, 2.3, 3.4, 5.6};
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json j_deque(c_deque);
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// create an array from std::list
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std::list<bool> c_list {true, true, false, true};
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json j_list(c_list);
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// create an array from std::forward_list
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std::forward_list<int64_t> c_flist {12345678909876, 23456789098765, 34567890987654, 45678909876543};
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json j_flist(c_flist);
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// create an array from std::array
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std::array<unsigned long, 4> c_array {{1, 2, 3, 4}};
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json j_array(c_array);
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// create an array from std::set
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std::set<std::string> c_set {"one", "two", "three", "four", "one"};
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json j_set(c_set); // only one entry for "one" is used
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// create an array from std::unordered_set
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std::unordered_set<std::string> c_uset {"one", "two", "three", "four", "one"};
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json j_uset(c_uset); // only one entry for "one" is used
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// create an array from std::multiset
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std::multiset<std::string> c_mset {"one", "two", "one", "four"};
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json j_mset(c_mset); // both entries for "one" are used
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// create an array from std::unordered_multiset
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std::unordered_multiset<std::string> c_umset {"one", "two", "one", "four"};
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json j_umset(c_umset); // both entries for "one" are used
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// serialize the JSON arrays
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std::cout << j_array_t << '\n';
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std::cout << j_vec << '\n';
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std::cout << j_deque << '\n';
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std::cout << j_list << '\n';
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std::cout << j_flist << '\n';
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std::cout << j_array << '\n';
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std::cout << j_set << '\n';
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std::cout << j_uset << '\n';
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std::cout << j_mset << '\n';
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std::cout << j_umset << "\n\n";
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// ============
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// string types
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// ============
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// create string from a string_t value
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json::string_t string_value = "The quick brown fox jumps over the lazy dog.";
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json j_string_t(string_value);
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// create a JSON string directly from a string literal
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json j_string_literal("The quick brown fox jumps over the lazy dog.");
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// create string from std::string
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std::string s_stdstring = "The quick brown fox jumps over the lazy dog.";
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json j_stdstring(s_stdstring);
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// serialize the JSON strings
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std::cout << j_string_t << '\n';
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std::cout << j_string_literal << '\n';
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std::cout << j_stdstring << "\n\n";
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// ============
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// number types
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// ============
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// create a JSON number from number_integer_t
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json::number_integer_t value_integer_t = -42;
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json j_integer_t(value_integer_t);
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// create a JSON number from number_unsigned_t
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json::number_integer_t value_unsigned_t = 17;
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json j_unsigned_t(value_unsigned_t);
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// create a JSON number from an anonymous enum
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enum { enum_value = 17 };
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json j_enum(enum_value);
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// create values of different integer types
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short n_short = 42;
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int n_int = -23;
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long n_long = 1024;
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int_least32_t n_int_least32_t = -17;
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uint8_t n_uint8_t = 8;
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// create (integer) JSON numbers
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json j_short(n_short);
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json j_int(n_int);
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json j_long(n_long);
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json j_int_least32_t(n_int_least32_t);
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json j_uint8_t(n_uint8_t);
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// create values of different floating-point types
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json::number_float_t v_ok = 3.141592653589793;
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json::number_float_t v_nan = NAN;
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json::number_float_t v_infinity = INFINITY;
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// create values of different floating-point types
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float n_float = 42.23;
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float n_float_nan = 1.0f / 0.0f;
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double n_double = 23.42;
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// create (floating point) JSON numbers
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json j_ok(v_ok);
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json j_nan(v_nan);
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json j_infinity(v_infinity);
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json j_float(n_float);
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json j_float_nan(n_float_nan);
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json j_double(n_double);
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// serialize the JSON numbers
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std::cout << j_integer_t << '\n';
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std::cout << j_unsigned_t << '\n';
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std::cout << j_enum << '\n';
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std::cout << j_short << '\n';
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std::cout << j_int << '\n';
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std::cout << j_long << '\n';
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std::cout << j_int_least32_t << '\n';
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std::cout << j_uint8_t << '\n';
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std::cout << j_ok << '\n';
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std::cout << j_nan << '\n';
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std::cout << j_infinity << '\n';
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std::cout << j_float << '\n';
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std::cout << j_float_nan << '\n';
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std::cout << j_double << "\n\n";
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// =============
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// boolean types
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// =============
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// create boolean values
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json j_truth = true;
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json j_falsity = false;
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// serialize the JSON booleans
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std::cout << j_truth << '\n';
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std::cout << j_falsity << '\n';
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}
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