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common
ScopedGuard.h
Go to the documentation of this file.
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/*
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* Copyright (c) 2016, NVIDIA CORPORATION. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of NVIDIA CORPORATION nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef SCOPED_GUARD_H
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#define SCOPED_GUARD_H
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namespace
ArgusSamples
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{
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/**
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* RAII-syle class performing an action when control flow leaves the scope. Typically the action
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* to be performed is to undo a previous action in case of an error.
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*/
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template
<
typename
T>
class
ScopedGuard
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{
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public
:
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/**
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* Action function type.
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*/
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typedef
bool (T::*
ActionType
)();
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/**
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* Constructor
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*
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* @param object [in] the object to perform the action on
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* @param action [in] the action to perform
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*/
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ScopedGuard
(T *
object
,
ActionType
action)
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:
m_object
(object)
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,
m_action
(action)
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{
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}
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/**
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* Destructor
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*/
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~ScopedGuard
()
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{
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leaveScope
();
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}
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/**
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* Cancel the action associated with this instance.
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*/
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void
cancel
()
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{
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m_action
= NULL;
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}
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private
:
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T *
m_object
;
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ActionType
m_action
;
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/**
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* Called when leaving the scope. Calls action and resets the action.
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*/
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void
leaveScope
()
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{
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if
(
m_action
&&
m_object
)
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{
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if
(!(
m_object
->*
m_action
)())
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REPORT_ERROR(
"Action call failed"
);
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m_object
= NULL;
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m_action
= NULL;
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}
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}
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/**
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* Hide default/copy constructor and assignment operator
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*/
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ScopedGuard
();
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ScopedGuard
(
ScopedGuard
&other);
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const
ScopedGuard
&
operator =
(
const
ScopedGuard
&);
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};
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}
// namespace ArgusSamples
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#endif // SCOPED_GUARD_H
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