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[Loki-lib-cvs] SF.net SVN: loki-lib:[1082] trunk/include/loki/ScopeGuard.h
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From: <ric...@us...> - 2011-06-21 01:07:29
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Revision: 1082
http://loki-lib.svn.sourceforge.net/loki-lib/?rev=1082&view=rev
Author: rich_sposato
Date: 2011-06-21 01:07:22 +0000 (Tue, 21 Jun 2011)
Log Message:
-----------
Added ExceptionPolicy enum.
Modified Paths:
--------------
trunk/include/loki/ScopeGuard.h
Modified: trunk/include/loki/ScopeGuard.h
===================================================================
--- trunk/include/loki/ScopeGuard.h 2010-10-30 03:12:56 UTC (rev 1081)
+++ trunk/include/loki/ScopeGuard.h 2011-06-21 01:07:22 UTC (rev 1082)
@@ -4,12 +4,12 @@
// Copyright (c) 2000 Petru Marginean
// Copyright (c) 2005 Joshua Lehrer
//
-// Permission to use, copy, modify, distribute and sell this software for any
-// purpose is hereby granted without fee, provided that the above copyright
-// notice appear in all copies and that both that copyright notice and this
+// Permission to use, copy, modify, distribute and sell this software for any
+// purpose is hereby granted without fee, provided that the above copyright
+// notice appear in all copies and that both that copyright notice and this
// permission notice appear in supporting documentation.
-// The author makes no representations about the
-// suitability of this software for any purpose. It is provided "as is"
+// The author makes no representations about the
+// suitability of this software for any purpose. It is provided "as is"
// without express or implied warranty.
////////////////////////////////////////////////////////////////////////////////
#ifndef LOKI_SCOPEGUARD_INC_
@@ -17,6 +17,7 @@
// $Id$
+#include <exception> // needed for calls to uncaught_exception.
#include <loki/RefToValue.h>
@@ -42,6 +43,30 @@
class ScopeGuardImplBase
{
+
+ public:
+
+ enum ExceptionPolicy
+ {
+ AlwaysExecute = 0,
+ CallIfNoException = 1,
+ CallIfException = 2
+ };
+
+ ScopeGuardImplBase() throw() : dismissed_(false), exceptionPolicy_( AlwaysExecute )
+ {}
+
+ void Dismiss() const throw()
+ {
+ dismissed_ = true;
+ }
+
+ void SetExceptionPolicy( ExceptionPolicy policy ) const throw()
+ {
+ exceptionPolicy_ = policy;
+ }
+
+ private:
/// Copy-assignment operator is not implemented and private.
ScopeGuardImplBase& operator =(const ScopeGuardImplBase&);
@@ -51,34 +76,42 @@
{}
/// Copy-constructor takes over responsibility from other ScopeGuard.
- ScopeGuardImplBase(const ScopeGuardImplBase& other) throw()
+ ScopeGuardImplBase(const ScopeGuardImplBase& other) throw()
: dismissed_(other.dismissed_)
+ , exceptionPolicy_( other.exceptionPolicy_ )
{
other.Dismiss();
}
template <typename J>
- static void SafeExecute(J& j) throw()
+ static void SafeExecute(J& j) throw()
{
+ if ( AlwaysExecute != j.exceptionPolicy_ )
+ {
+ const bool anyThrown = ::std::uncaught_exception();
+ if ( anyThrown )
+ {
+ if ( CallIfNoException == j.exceptionPolicy_ )
+ j.Dismiss();
+ }
+ else if ( CallIfException == j.exceptionPolicy_ )
+ {
+ j.Dismiss();
+ }
+ }
if (!j.dismissed_)
+ {
try
{
j.Execute();
}
catch(...)
{}
+ }
}
-
+
mutable bool dismissed_;
-
- public:
- ScopeGuardImplBase() throw() : dismissed_(false)
- {}
-
- void Dismiss() const throw()
- {
- dismissed_ = true;
- }
+ mutable ExceptionPolicy exceptionPolicy_;
};
////////////////////////////////////////////////////////////////
@@ -113,24 +146,24 @@
return ScopeGuardImpl0<F>(fun);
}
- ~ScopeGuardImpl0() throw()
+ ~ScopeGuardImpl0() throw()
{
SafeExecute(*this);
}
- void Execute()
+ void Execute()
{
fun_();
}
protected:
- ScopeGuardImpl0(F fun) : fun_(fun)
+ ScopeGuardImpl0(F fun) : fun_(fun)
{}
F fun_;
};
- template <typename F>
+ template <typename F>
inline ScopeGuardImpl0<F> MakeGuard(F fun)
{
return ScopeGuardImpl0<F>::MakeGuard(fun);
@@ -160,7 +193,7 @@
return ScopeGuardImpl1<F, P1>(fun, p1);
}
- ~ScopeGuardImpl1() throw()
+ ~ScopeGuardImpl1() throw()
{
SafeExecute(*this);
}
@@ -171,14 +204,14 @@
}
protected:
- ScopeGuardImpl1(F fun, P1 p1) : fun_(fun), p1_(p1)
+ ScopeGuardImpl1(F fun, P1 p1) : fun_(fun), p1_(p1)
{}
F fun_;
const P1 p1_;
};
- template <typename F, typename P1>
+ template <typename F, typename P1>
inline ScopeGuardImpl1<F, P1> MakeGuard(F fun, P1 p1)
{
return ScopeGuardImpl1<F, P1>::MakeGuard(fun, p1);
@@ -208,7 +241,7 @@
return ScopeGuardImpl2<F, P1, P2>(fun, p1, p2);
}
- ~ScopeGuardImpl2() throw()
+ ~ScopeGuardImpl2() throw()
{
SafeExecute(*this);
}
@@ -219,7 +252,7 @@
}
protected:
- ScopeGuardImpl2(F fun, P1 p1, P2 p2) : fun_(fun), p1_(p1), p2_(p2)
+ ScopeGuardImpl2(F fun, P1 p1, P2 p2) : fun_(fun), p1_(p1), p2_(p2)
{}
F fun_;
@@ -257,7 +290,7 @@
return ScopeGuardImpl3<F, P1, P2, P3>(fun, p1, p2, p3);
}
- ~ScopeGuardImpl3() throw()
+ ~ScopeGuardImpl3() throw()
{
SafeExecute(*this);
}
@@ -268,7 +301,7 @@
}
protected:
- ScopeGuardImpl3(F fun, P1 p1, P2 p2, P3 p3) : fun_(fun), p1_(p1), p2_(p2), p3_(p3)
+ ScopeGuardImpl3(F fun, P1 p1, P2 p2, P3 p3) : fun_(fun), p1_(p1), p2_(p2), p3_(p3)
{}
F fun_;
@@ -308,7 +341,7 @@
return ScopeGuardImpl4< F, P1, P2, P3, P4 >( fun, p1, p2, p3, p4 );
}
- ~ScopeGuardImpl4() throw()
+ ~ScopeGuardImpl4() throw()
{
SafeExecute( *this );
}
@@ -361,7 +394,7 @@
return ScopeGuardImpl5< F, P1, P2, P3, P4, P5 >( fun, p1, p2, p3, p4, p5 );
}
- ~ScopeGuardImpl5() throw()
+ ~ScopeGuardImpl5() throw()
{
SafeExecute( *this );
}
@@ -415,18 +448,18 @@
return ObjScopeGuardImpl0<Obj, MemFun>(obj, memFun);
}
- ~ObjScopeGuardImpl0() throw()
+ ~ObjScopeGuardImpl0() throw()
{
SafeExecute(*this);
}
- void Execute()
+ void Execute()
{
(obj_.*memFun_)();
}
protected:
- ObjScopeGuardImpl0(Obj& obj, MemFun memFun) : obj_(obj), memFun_(memFun)
+ ObjScopeGuardImpl0(Obj& obj, MemFun memFun) : obj_(obj), memFun_(memFun)
{}
Obj& obj_;
@@ -440,13 +473,13 @@
}
template <typename Ret, class Obj1, class Obj2>
- inline ObjScopeGuardImpl0<Obj1,Ret(Obj2::*)()> MakeGuard(Ret(Obj2::*memFun)(), Obj1 &obj)
+ inline ObjScopeGuardImpl0<Obj1,Ret(Obj2::*)()> MakeGuard(Ret(Obj2::*memFun)(), Obj1 &obj)
{
return ObjScopeGuardImpl0<Obj1,Ret(Obj2::*)()>::MakeObjGuard(obj,memFun);
}
template <typename Ret, class Obj1, class Obj2>
- inline ObjScopeGuardImpl0<Obj1,Ret(Obj2::*)()> MakeGuard(Ret(Obj2::*memFun)(), Obj1 *obj)
+ inline ObjScopeGuardImpl0<Obj1,Ret(Obj2::*)()> MakeGuard(Ret(Obj2::*memFun)(), Obj1 *obj)
{
return ObjScopeGuardImpl0<Obj1,Ret(Obj2::*)()>::MakeObjGuard(*obj,memFun);
}
@@ -477,20 +510,20 @@
return ObjScopeGuardImpl1<Obj, MemFun, P1>(obj, memFun, p1);
}
- ~ObjScopeGuardImpl1() throw()
+ ~ObjScopeGuardImpl1() throw()
{
SafeExecute(*this);
}
- void Execute()
+ void Execute()
{
(obj_.*memFun_)(p1_);
}
protected:
- ObjScopeGuardImpl1(Obj& obj, MemFun memFun, P1 p1) : obj_(obj), memFun_(memFun), p1_(p1)
+ ObjScopeGuardImpl1(Obj& obj, MemFun memFun, P1 p1) : obj_(obj), memFun_(memFun), p1_(p1)
{}
-
+
Obj& obj_;
MemFun memFun_;
const P1 p1_;
@@ -503,13 +536,13 @@
}
template <typename Ret, class Obj1, class Obj2, typename P1a, typename P1b>
- inline ObjScopeGuardImpl1<Obj1,Ret(Obj2::*)(P1a),P1b> MakeGuard(Ret(Obj2::*memFun)(P1a), Obj1 &obj, P1b p1)
+ inline ObjScopeGuardImpl1<Obj1,Ret(Obj2::*)(P1a),P1b> MakeGuard(Ret(Obj2::*memFun)(P1a), Obj1 &obj, P1b p1)
{
return ObjScopeGuardImpl1<Obj1,Ret(Obj2::*)(P1a),P1b>::MakeObjGuard(obj,memFun,p1);
}
template <typename Ret, class Obj1, class Obj2, typename P1a, typename P1b>
- inline ObjScopeGuardImpl1<Obj1,Ret(Obj2::*)(P1a),P1b> MakeGuard(Ret(Obj2::*memFun)(P1a), Obj1 *obj, P1b p1)
+ inline ObjScopeGuardImpl1<Obj1,Ret(Obj2::*)(P1a),P1b> MakeGuard(Ret(Obj2::*memFun)(P1a), Obj1 *obj, P1b p1)
{
return ObjScopeGuardImpl1<Obj1,Ret(Obj2::*)(P1a),P1b>::MakeObjGuard(*obj,memFun,p1);
}
@@ -540,18 +573,18 @@
return ObjScopeGuardImpl2<Obj, MemFun, P1, P2>(obj, memFun, p1, p2);
}
- ~ObjScopeGuardImpl2() throw()
+ ~ObjScopeGuardImpl2() throw()
{
SafeExecute(*this);
}
- void Execute()
+ void Execute()
{
(obj_.*memFun_)(p1_, p2_);
}
protected:
- ObjScopeGuardImpl2(Obj& obj, MemFun memFun, P1 p1, P2 p2) : obj_(obj), memFun_(memFun), p1_(p1), p2_(p2)
+ ObjScopeGuardImpl2(Obj& obj, MemFun memFun, P1 p1, P2 p2) : obj_(obj), memFun_(memFun), p1_(p1), p2_(p2)
{}
Obj& obj_;
@@ -567,13 +600,13 @@
}
template <typename Ret, class Obj1, class Obj2, typename P1a, typename P1b, typename P2a, typename P2b>
- inline ObjScopeGuardImpl2<Obj1,Ret(Obj2::*)(P1a,P2a),P1b,P2b> MakeGuard(Ret(Obj2::*memFun)(P1a,P2a), Obj1 &obj, P1b p1, P2b p2)
+ inline ObjScopeGuardImpl2<Obj1,Ret(Obj2::*)(P1a,P2a),P1b,P2b> MakeGuard(Ret(Obj2::*memFun)(P1a,P2a), Obj1 &obj, P1b p1, P2b p2)
{
return ObjScopeGuardImpl2<Obj1,Ret(Obj2::*)(P1a,P2a),P1b,P2b>::MakeObjGuard(obj,memFun,p1,p2);
}
template <typename Ret, class Obj1, class Obj2, typename P1a, typename P1b, typename P2a, typename P2b>
- inline ObjScopeGuardImpl2<Obj1,Ret(Obj2::*)(P1a,P2a),P1b,P2b> MakeGuard(Ret(Obj2::*memFun)(P1a,P2a), Obj1 *obj, P1b p1, P2b p2)
+ inline ObjScopeGuardImpl2<Obj1,Ret(Obj2::*)(P1a,P2a),P1b,P2b> MakeGuard(Ret(Obj2::*memFun)(P1a,P2a), Obj1 *obj, P1b p1, P2b p2)
{
return ObjScopeGuardImpl2<Obj1,Ret(Obj2::*)(P1a,P2a),P1b,P2b>::MakeObjGuard(*obj,memFun,p1,p2);
}
@@ -605,12 +638,12 @@
return ObjScopeGuardImpl3< Obj, MemFun, P1, P2, P3 >( obj, memFun, p1, p2, p3 );
}
- ~ObjScopeGuardImpl3() throw()
+ ~ObjScopeGuardImpl3() throw()
{
SafeExecute( *this );
}
- void Execute()
+ void Execute()
{
( obj_.*memFun_ )( p1_, p2_, p3_ );
}
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