Json.constructor

// 1
constexpr Json() noexcept = default;

//  2
Json(const Json&) noexcept = default;

// 3
Json(Json&& other) noexcept;

// 4
template<typename T>
requires constructible<Json, std::remove_cvref_t<T>>
Json(T&& other) noexcept;

// 5
template<typename T>
requires !constructible<Json, std::remove_cvref_t<T>> && !constructible_map<Json, std::remove_cvref_t<T>> && constructible_array<Json, std::remove_cvref_t<T>>
explicit Json(T&& other) noexcept;

// 6
template<typename T>
requires !constructible<Json, std::remove_cvref_t<T>> && constructible_map<Json, std::remove_cvref_t<T>>
explicit Json(T&& other) noexcept;

1. Default constructor - initializes to Nul

2. Copy constructor - creates new Json object with copied value

3. Move constructor - transfers value to new Json object (source becomes Nul), noexcept

4. Implicit constructor - accepts any type convertible to JSON (arithmetic/enum→Num, JSON types, custom convertible types)

   • Noexcept guaranteed only for simple types or rvalue complex types

5. Explicit constructor - accepts array-like types (std::vector, std::list etc.) with constructible elements

6. Explicit constructor - accepts map-like types (std::map, std::unordered_map etc.) with constructible elements

Exceptions

No-throw guarantee

Complexity

1. O(1)
2. O(n)
3. O(1)
4. O(1) for simple types, O(n) for copyable types, O(1) for movable types
5. O(n)
6. O(n)

Version

Since v3.0.0 .