From d35d19584cf56a50b4833ff9c003597e01022f27 Mon Sep 17 00:00:00 2001
From: Pedro Alves <palves@redhat.com>
Date: Tue, 18 Apr 2017 21:39:24 +0100
Subject: gdb::optional unit tests
I thought I'd add some unit tests to make sure gdb::optional behaved
correctly, and started writing some, but then thought/realized that
libstdc++ already has extensive testing for C++17 std::optional, which
gdb::optional is a subset of, and thought why bother writing something
from scratch. So I tried copying over a subset of libstdc++'s tests
(that ones that cover the subset supported by gdb::optional), and was
positively surprised that they mostly work OOTB. This did help shake
out a few bugs from what I was implementing in the previous patch to
gdb::optional. Still, it's a good chunk of code being copied over, so
if people dislike this copying/duplication, I can drop this patch.
gdb/ChangeLog:
2017-04-18 Pedro Alves <palves@redhat.com>
* Makefile.in (SUBDIR_UNITTESTS_SRCS): Add
unittests/optional-selftests.c.
(SUBDIR_UNITTESTS_OBS): Add optional-selftests.o.
* unittests/optional-selftests.c: New file.
* unittests/optional/assignment/1.cc: New file.
* unittests/optional/assignment/2.cc: New file.
* unittests/optional/assignment/3.cc: New file.
* unittests/optional/assignment/4.cc: New file.
* unittests/optional/assignment/5.cc: New file.
* unittests/optional/assignment/6.cc: New file.
* unittests/optional/assignment/7.cc: New file.
* unittests/optional/cons/copy.cc: New file.
* unittests/optional/cons/default.cc: New file.
* unittests/optional/cons/move.cc: New file.
* unittests/optional/cons/value.cc: New file.
* unittests/optional/in_place.cc: New file.
* unittests/optional/observers/1.cc: New file.
* unittests/optional/observers/2.cc: New file.
---
gdb/unittests/optional/assignment/3.cc | 156 +++++++++++++++++++++++++++++++++
1 file changed, 156 insertions(+)
create mode 100644 gdb/unittests/optional/assignment/3.cc
(limited to 'gdb/unittests/optional/assignment/3.cc')
diff --git a/gdb/unittests/optional/assignment/3.cc b/gdb/unittests/optional/assignment/3.cc
new file mode 100644
index 0000000..e047e74
--- /dev/null
+++ b/gdb/unittests/optional/assignment/3.cc
@@ -0,0 +1,156 @@
+// Copyright (C) 2013-2017 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library 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, or (at your option)
+// any later version.
+
+// This library 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 this library; see the file COPYING3. If not see
+// <http://www.gnu.org/licenses/>.
+
+namespace assign_3 {
+
+struct exception {};
+
+int counter = 0;
+
+struct mixin_counter
+{
+ mixin_counter() { ++counter; }
+ mixin_counter(mixin_counter const&) { ++counter; }
+ ~mixin_counter() { --counter; }
+};
+
+struct value_type : private mixin_counter
+{
+ enum state_type
+ {
+ zero,
+ moved_from,
+ throwing_construction,
+ throwing_copy,
+ throwing_copy_assignment,
+ throwing_move,
+ throwing_move_assignment,
+ threw,
+ };
+
+ value_type() = default;
+
+ explicit value_type(state_type state_)
+ : state(state_)
+ {
+ throw_if(throwing_construction);
+ }
+
+ value_type(value_type const& other)
+ : state(other.state)
+ {
+ throw_if(throwing_copy);
+ }
+
+ value_type&
+ operator=(value_type const& other)
+ {
+ state = other.state;
+ throw_if(throwing_copy_assignment);
+ return *this;
+ }
+
+ value_type(value_type&& other)
+ : state(other.state)
+ {
+ other.state = moved_from;
+ throw_if(throwing_move);
+ }
+
+ value_type&
+ operator=(value_type&& other)
+ {
+ state = other.state;
+ other.state = moved_from;
+ throw_if(throwing_move_assignment);
+ return *this;
+ }
+
+ void throw_if(state_type match)
+ {
+ if(state == match)
+ {
+ state = threw;
+ throw exception {};
+ }
+ }
+
+ state_type state = zero;
+};
+
+void test()
+{
+ using O = gdb::optional<value_type>;
+ using S = value_type::state_type;
+ auto const make = [](S s = S::zero) { return value_type { s }; };
+
+ enum outcome_type { nothrow, caught, bad_catch };
+
+ // Check value assignment for disengaged optional
+
+ {
+ O o;
+ value_type v = make(S::throwing_copy_assignment);
+ o = v;
+ VERIFY( o && o->state == S::throwing_copy_assignment );
+ }
+
+ {
+ O o;
+ value_type v = make(S::throwing_move_assignment);
+ o = std::move(v);
+ VERIFY( o && o->state == S::throwing_move_assignment );
+ }
+
+ {
+ ATTRIBUTE_UNUSED outcome_type outcome {};
+ O o;
+ value_type v = make(S::throwing_copy);
+
+ try
+ {
+ o = v;
+ }
+ catch(exception const&)
+ { outcome = caught; }
+ catch(...)
+ { outcome = bad_catch; }
+
+ VERIFY( !o );
+ }
+
+ {
+ ATTRIBUTE_UNUSED outcome_type outcome {};
+ O o;
+ value_type v = make(S::throwing_move);
+
+ try
+ {
+ o = std::move(v);
+ }
+ catch(exception const&)
+ { outcome = caught; }
+ catch(...)
+ { outcome = bad_catch; }
+
+ VERIFY( !o );
+ }
+
+ VERIFY( counter == 0 );
+}
+
+} // namespace assign_3
--
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