From af52b7b6cd86d555f7b5b611eab1ade3cf0b6c6e Mon Sep 17 00:00:00 2001 From: Carl Hetherington Date: Mon, 8 Jan 2024 16:01:04 +0100 Subject: Add ScopeGuard. --- src/scope_guard.h | 76 ++++++++++++++++++++++++++++++++++++++++++++++++ src/wscript | 1 + test/scope_guard_test.cc | 49 +++++++++++++++++++++++++++++++ test/wscript | 1 + 4 files changed, 127 insertions(+) create mode 100644 src/scope_guard.h create mode 100644 test/scope_guard_test.cc diff --git a/src/scope_guard.h b/src/scope_guard.h new file mode 100644 index 00000000..37b963ad --- /dev/null +++ b/src/scope_guard.h @@ -0,0 +1,76 @@ +/* + Copyright (C) 2024 Carl Hetherington + + This file is part of libdcp. + + libdcp 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 2 of the License, or + (at your option) any later version. + + libdcp 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 libdcp. If not, see . + + In addition, as a special exception, the copyright holders give + permission to link the code of portions of this program with the + OpenSSL library under certain conditions as described in each + individual source file, and distribute linked combinations + including the two. + + You must obey the GNU General Public License in all respects + for all of the code used other than OpenSSL. If you modify + file(s) with this exception, you may extend this exception to your + version of the file(s), but you are not obligated to do so. If you + do not wish to do so, delete this exception statement from your + version. If you delete this exception statement from all source + files in the program, then also delete it here. +*/ + + +#ifndef LIBDCP_SCOPE_GUARD_H +#define LIBDCP_SCOPE_GUARD_H + + +#include + + +namespace dcp { + + +class ScopeGuard +{ +public: + template + ScopeGuard(F const& function) + : _function(function) + {} + + ScopeGuard(ScopeGuard&& other) + : _function(std::move(other._function)) + { + other._function = []{}; + } + + ScopeGuard(ScopeGuard const&) = delete; + ScopeGuard& operator=(ScopeGuard const&) = delete; + + ~ScopeGuard() + { + _function(); + } + +private: + std::function _function; +}; + + +} + + +#endif + diff --git a/src/wscript b/src/wscript index 3bc8537b..c2d499c8 100644 --- a/src/wscript +++ b/src/wscript @@ -208,6 +208,7 @@ def build(bld): ref.h ruby.h s_gamut3_transfer_function.h + scope_guard.h search.h smpte_load_font_node.h smpte_subtitle_asset.h diff --git a/test/scope_guard_test.cc b/test/scope_guard_test.cc new file mode 100644 index 00000000..54c0dcbb --- /dev/null +++ b/test/scope_guard_test.cc @@ -0,0 +1,49 @@ +/* + Copyright (C) 2015-2021 Carl Hetherington + + This file is part of libdcp. + + libdcp 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 2 of the License, or + (at your option) any later version. + + libdcp 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 libdcp. If not, see . + + In addition, as a special exception, the copyright holders give + permission to link the code of portions of this program with the + OpenSSL library under certain conditions as described in each + individual source file, and distribute linked combinations + including the two. + + You must obey the GNU General Public License in all respects + for all of the code used other than OpenSSL. If you modify + file(s) with this exception, you may extend this exception to your + version of the file(s), but you are not obligated to do so. If you + do not wish to do so, delete this exception statement from your + version. If you delete this exception statement from all source + files in the program, then also delete it here. +*/ + + +#include "scope_guard.h" +#include + + +BOOST_AUTO_TEST_CASE(scope_guard_test) +{ + int x = 0; + + { + dcp::ScopeGuard sg = [&x]() { x = 42; }; + BOOST_CHECK_EQUAL (x, 0); + } + + BOOST_CHECK_EQUAL (x, 42); +} diff --git a/test/wscript b/test/wscript index 4d9278eb..d2cac0b3 100644 --- a/test/wscript +++ b/test/wscript @@ -104,6 +104,7 @@ def build(bld): recovery_test.cc rgb_xyz_test.cc round_trip_test.cc + scope_guard_test.cc shared_subtitle_test.cc smpte_load_font_test.cc smpte_subtitle_test.cc -- cgit v1.2.3