From ec16afc74753e3ee5d7ac8f4e1a0320ddc7ab262 Mon Sep 17 00:00:00 2001
From: Danny Robson <danny@nerdcruft.net>
Date: Mon, 3 Dec 2018 15:29:21 +1100
Subject: [PATCH] except: add custom base exception

---
 CMakeLists.txt |  2 ++
 except.cpp     | 17 +++++++++++++++++
 except.hpp     | 22 ++++++++++++++++++++++
 3 files changed, 41 insertions(+)
 create mode 100644 except.cpp
 create mode 100644 except.hpp

diff --git a/CMakeLists.txt b/CMakeLists.txt
index cdfa1058..4f6b07f4 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -251,6 +251,8 @@ list (
     encode/base.hpp
     endian.cpp
     endian.hpp
+    except.cpp
+    except.hpp
     exe.hpp
     extent.cpp
     extent.hpp
diff --git a/except.cpp b/except.cpp
new file mode 100644
index 00000000..fd813a6c
--- /dev/null
+++ b/except.cpp
@@ -0,0 +1,17 @@
+/*
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * Copyright 2018 Danny Robson <danny@nerdcruft.net>
+ */
+
+#include "except.hpp"
+
+
+///////////////////////////////////////////////////////////////////////////////
+std::ostream&
+cruft::operator<< (std::ostream &os, const cruft::error &obj)
+{
+    return obj.describe (os);
+}
diff --git a/except.hpp b/except.hpp
new file mode 100644
index 00000000..698594b3
--- /dev/null
+++ b/except.hpp
@@ -0,0 +1,22 @@
+/*
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * Copyright 2018 Danny Robson <danny@nerdcruft.net>
+ */
+
+#pragma once
+
+#include <iosfwd>
+
+namespace cruft {
+    class error {
+    public:
+        virtual ~error () = default;
+        virtual std::ostream& describe (std::ostream&) const noexcept = 0;
+    };
+
+
+    std::ostream& operator<< (std::ostream &os, error const&);
+}
\ No newline at end of file