Dereference.

libsolutil/CMakeLists.txt

@@ -34,6 +34,7 @@ set(sources
 	UTF8.cpp
 	UTF8.h
 	vector_ref.h
+	Views.h
 	Visitor.h
 	Whiskers.cpp
 	Whiskers.h

libsolutil/Views.h

@@ -0,0 +1,39 @@
+/*
+	This file is part of solidity.
+
+	solidity is free software: you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
+
+	solidity is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
+*/
+// SPDX-License-Identifier: GPL-3.0
+
+#pragma once
+
+#include <range/v3/view/transform.hpp>
+
+#include <liblangutil/Exceptions.h>
+
+
+namespace solidity::util::views
+{
+
+static constexpr auto dereference = ranges::views::transform([](auto&& x) -> decltype(auto) { return *x; });
+
+static constexpr auto dereferenceChecked = ranges::views::transform(
+	[](auto&& x) -> decltype(auto)
+	{
+		solAssert(x, "");
+		return *x;
+	}
+);
+
+}