Add support for std::unique_ptr and std::shared_ptr

include/soci/std-ptr.h

@@ -0,0 +1,85 @@
+//
+// Copyright (C) 2023 Elyas El Idrissi
+// Distributed under the Boost Software License, Version 1.0.
+// (See accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef SOCI_STD_PTR_H_INCLUDED
+#define SOCI_STD_PTR_H_INCLUDED
+
+#include "soci/type-conversion-traits.h"
+
+#include <memory>
+
+namespace soci
+{
+	// simple fall-back for std::unique_ptr
+	template <typename T>
+	struct type_conversion<std::unique_ptr<T>>
+	{
+		typedef typename type_conversion<T>::base_type base_type;
+
+		static void from_base(base_type const & in, indicator ind, std::unique_ptr<T> & out)
+		{
+			if (ind == i_null)
+			{
+				out.reset();
+			}
+			else
+			{
+				T tmp = T();
+				type_conversion<T>::from_base(in, ind, tmp);
+				out = std::make_unique<T>(tmp);
+			}
+		}
+
+		static void to_base(std::unique_ptr<T> const & in, base_type & out, indicator & ind)
+		{
+			if (in)
+			{
+				type_conversion<T>::to_base(*in, out, ind);
+			}
+			else
+			{
+				ind = i_null;
+			}
+		}
+	};
+
+	// simple fall-back for std::shared_ptr
+	template <typename T>
+	struct type_conversion<std::shared_ptr<T> >
+	{
+		typedef typename type_conversion<T>::base_type base_type;
+
+		static void from_base(base_type const & in, indicator ind,
+			std::shared_ptr<T> & out)
+		{
+			if (ind == i_null)
+			{
+				out.reset();
+			}
+			else
+			{
+				T tmp = T();
+				type_conversion<T>::from_base(in, ind, tmp);
+				out = std::make_shared<T>(tmp);
+			}
+		}
+
+		static void to_base(std::shared_ptr<T> const & in, base_type & out, indicator & ind)
+		{
+			if (in)
+			{
+				type_conversion<T>::to_base(*in, out, ind);
+			}
+			else
+			{
+				ind = i_null;
+			}
+		}
+	};
+}
+
+#endif // SOCI_STD_PTR_H_INCLUDED