Function create

Source/external/json.hpp:19551–19569

	/// @}

  private:

	/// helper for exception-safe object creation
	template<typename T, typename... Args>
	JSON_HEDLEY_RETURNS_NON_NULL
	static T* create(Args&& ... args)
	{
		AllocatorType<T> alloc;
		using AllocatorTraits = std::allocator_traits<AllocatorType<T>>;

		auto deleter = [&](T * obj)
		{
			AllocatorTraits::deallocate(alloc, obj, 1);
		};
		std::unique_ptr<T, decltype(deleter)> obj(AllocatorTraits::allocate(alloc, 1), deleter);
		AllocatorTraits::construct(alloc, obj.get(), std::forward<Args>(args)...);
		JSON_ASSERT(obj != nullptr);
		return obj.release();
	}

	////////////////////////
	// JSON value storage //