278 lines
7.8 KiB
C++
Executable File
278 lines
7.8 KiB
C++
Executable File
/* Copyright 2003-2008 Joaquin M Lopez Munoz.
|
|
* Distributed under the Boost Software License, Version 1.0.
|
|
* (See accompanying file LICENSE_1_0.txt or copy at
|
|
* http://www.boost.org/LICENSE_1_0.txt)
|
|
*
|
|
* See http://www.boost.org/libs/multi_index for library home page.
|
|
*/
|
|
|
|
#ifndef BOOST_MULTI_INDEX_DETAIL_SCOPE_GUARD_HPP
|
|
#define BOOST_MULTI_INDEX_DETAIL_SCOPE_GUARD_HPP
|
|
|
|
#if defined(_MSC_VER)&&(_MSC_VER>=1200)
|
|
#pragma once
|
|
#endif
|
|
|
|
namespace boost{
|
|
|
|
namespace multi_index{
|
|
|
|
namespace detail{
|
|
|
|
/* Until some official version of the ScopeGuard idiom makes it into Boost,
|
|
* we locally define our own. This is a merely reformated version of
|
|
* ScopeGuard.h as defined in:
|
|
* Alexandrescu, A., Marginean, P.:"Generic<Programming>: Change the Way You
|
|
* Write Exception-Safe Code - Forever", C/C++ Users Jornal, Dec 2000,
|
|
* http://www.cuj.com/documents/s=8000/cujcexp1812alexandr/
|
|
* with the following modifications:
|
|
* - General pretty formatting (pretty to my taste at least.)
|
|
* - Naming style changed to standard C++ library requirements.
|
|
* - safe_execute does not feature a try-catch protection, so we can
|
|
* use this even if BOOST_NO_EXCEPTIONS is defined.
|
|
* - Added scope_guard_impl4 and obj_scope_guard_impl3, (Boost.MultiIndex
|
|
* needs them). A better design would provide guards for many more
|
|
* arguments through the Boost Preprocessor Library.
|
|
* - Added scope_guard_impl_base::touch (see below.)
|
|
* - Removed RefHolder and ByRef, whose functionality is provided
|
|
* already by Boost.Ref.
|
|
* - Removed static make_guard's and make_obj_guard's, so that the code
|
|
* will work even if BOOST_NO_MEMBER_TEMPLATES is defined. This forces
|
|
* us to move some private ctors to public, though.
|
|
*
|
|
* NB: CodeWarrior Pro 8 seems to have problems looking up safe_execute
|
|
* without an explicit qualification.
|
|
*/
|
|
|
|
class scope_guard_impl_base
|
|
{
|
|
public:
|
|
scope_guard_impl_base():dismissed_(false){}
|
|
void dismiss()const{dismissed_=true;}
|
|
|
|
/* This helps prevent some "unused variable" warnings under, for instance,
|
|
* GCC 3.2.
|
|
*/
|
|
void touch()const{}
|
|
|
|
protected:
|
|
~scope_guard_impl_base(){}
|
|
|
|
scope_guard_impl_base(const scope_guard_impl_base& other):
|
|
dismissed_(other.dismissed_)
|
|
{
|
|
other.dismiss();
|
|
}
|
|
|
|
template<typename J>
|
|
static void safe_execute(J& j){if(!j.dismissed_)j.execute();}
|
|
|
|
mutable bool dismissed_;
|
|
|
|
private:
|
|
scope_guard_impl_base& operator=(const scope_guard_impl_base&);
|
|
};
|
|
|
|
typedef const scope_guard_impl_base& scope_guard;
|
|
|
|
template<typename F>
|
|
class scope_guard_impl0:public scope_guard_impl_base
|
|
{
|
|
public:
|
|
scope_guard_impl0(F fun):fun_(fun){}
|
|
~scope_guard_impl0(){scope_guard_impl_base::safe_execute(*this);}
|
|
void execute(){fun_();}
|
|
|
|
protected:
|
|
|
|
F fun_;
|
|
};
|
|
|
|
template<typename F>
|
|
inline scope_guard_impl0<F> make_guard(F fun)
|
|
{
|
|
return scope_guard_impl0<F>(fun);
|
|
}
|
|
|
|
template<typename F,typename P1>
|
|
class scope_guard_impl1:public scope_guard_impl_base
|
|
{
|
|
public:
|
|
scope_guard_impl1(F fun,P1 p1):fun_(fun),p1_(p1){}
|
|
~scope_guard_impl1(){scope_guard_impl_base::safe_execute(*this);}
|
|
void execute(){fun_(p1_);}
|
|
|
|
protected:
|
|
F fun_;
|
|
const P1 p1_;
|
|
};
|
|
|
|
template<typename F,typename P1>
|
|
inline scope_guard_impl1<F,P1> make_guard(F fun,P1 p1)
|
|
{
|
|
return scope_guard_impl1<F,P1>(fun,p1);
|
|
}
|
|
|
|
template<typename F,typename P1,typename P2>
|
|
class scope_guard_impl2:public scope_guard_impl_base
|
|
{
|
|
public:
|
|
scope_guard_impl2(F fun,P1 p1,P2 p2):fun_(fun),p1_(p1),p2_(p2){}
|
|
~scope_guard_impl2(){scope_guard_impl_base::safe_execute(*this);}
|
|
void execute(){fun_(p1_,p2_);}
|
|
|
|
protected:
|
|
F fun_;
|
|
const P1 p1_;
|
|
const P2 p2_;
|
|
};
|
|
|
|
template<typename F,typename P1,typename P2>
|
|
inline scope_guard_impl2<F,P1,P2> make_guard(F fun,P1 p1,P2 p2)
|
|
{
|
|
return scope_guard_impl2<F,P1,P2>(fun,p1,p2);
|
|
}
|
|
|
|
template<typename F,typename P1,typename P2,typename P3>
|
|
class scope_guard_impl3:public scope_guard_impl_base
|
|
{
|
|
public:
|
|
scope_guard_impl3(F fun,P1 p1,P2 p2,P3 p3):fun_(fun),p1_(p1),p2_(p2),p3_(p3){}
|
|
~scope_guard_impl3(){scope_guard_impl_base::safe_execute(*this);}
|
|
void execute(){fun_(p1_,p2_,p3_);}
|
|
|
|
protected:
|
|
F fun_;
|
|
const P1 p1_;
|
|
const P2 p2_;
|
|
const P3 p3_;
|
|
};
|
|
|
|
template<typename F,typename P1,typename P2,typename P3>
|
|
inline scope_guard_impl3<F,P1,P2,P3> make_guard(F fun,P1 p1,P2 p2,P3 p3)
|
|
{
|
|
return scope_guard_impl3<F,P1,P2,P3>(fun,p1,p2,p3);
|
|
}
|
|
|
|
template<typename F,typename P1,typename P2,typename P3,typename P4>
|
|
class scope_guard_impl4:public scope_guard_impl_base
|
|
{
|
|
public:
|
|
scope_guard_impl4(F fun,P1 p1,P2 p2,P3 p3,P4 p4):
|
|
fun_(fun),p1_(p1),p2_(p2),p3_(p3),p4_(p4){}
|
|
~scope_guard_impl4(){scope_guard_impl_base::safe_execute(*this);}
|
|
void execute(){fun_(p1_,p2_,p3_,p4_);}
|
|
|
|
protected:
|
|
F fun_;
|
|
const P1 p1_;
|
|
const P2 p2_;
|
|
const P3 p3_;
|
|
const P4 p4_;
|
|
};
|
|
|
|
template<typename F,typename P1,typename P2,typename P3,typename P4>
|
|
inline scope_guard_impl4<F,P1,P2,P3,P4> make_guard(
|
|
F fun,P1 p1,P2 p2,P3 p3,P4 p4)
|
|
{
|
|
return scope_guard_impl4<F,P1,P2,P3,P4>(fun,p1,p2,p3,p4);
|
|
}
|
|
|
|
template<class Obj,typename MemFun>
|
|
class obj_scope_guard_impl0:public scope_guard_impl_base
|
|
{
|
|
public:
|
|
obj_scope_guard_impl0(Obj& obj,MemFun mem_fun):obj_(obj),mem_fun_(mem_fun){}
|
|
~obj_scope_guard_impl0(){scope_guard_impl_base::safe_execute(*this);}
|
|
void execute(){(obj_.*mem_fun_)();}
|
|
|
|
protected:
|
|
Obj& obj_;
|
|
MemFun mem_fun_;
|
|
};
|
|
|
|
template<class Obj,typename MemFun>
|
|
inline obj_scope_guard_impl0<Obj,MemFun> make_obj_guard(Obj& obj,MemFun mem_fun)
|
|
{
|
|
return obj_scope_guard_impl0<Obj,MemFun>(obj,mem_fun);
|
|
}
|
|
|
|
template<class Obj,typename MemFun,typename P1>
|
|
class obj_scope_guard_impl1:public scope_guard_impl_base
|
|
{
|
|
public:
|
|
obj_scope_guard_impl1(Obj& obj,MemFun mem_fun,P1 p1):
|
|
obj_(obj),mem_fun_(mem_fun),p1_(p1){}
|
|
~obj_scope_guard_impl1(){scope_guard_impl_base::safe_execute(*this);}
|
|
void execute(){(obj_.*mem_fun_)(p1_);}
|
|
|
|
protected:
|
|
Obj& obj_;
|
|
MemFun mem_fun_;
|
|
const P1 p1_;
|
|
};
|
|
|
|
template<class Obj,typename MemFun,typename P1>
|
|
inline obj_scope_guard_impl1<Obj,MemFun,P1> make_obj_guard(
|
|
Obj& obj,MemFun mem_fun,P1 p1)
|
|
{
|
|
return obj_scope_guard_impl1<Obj,MemFun,P1>(obj,mem_fun,p1);
|
|
}
|
|
|
|
template<class Obj,typename MemFun,typename P1,typename P2>
|
|
class obj_scope_guard_impl2:public scope_guard_impl_base
|
|
{
|
|
public:
|
|
obj_scope_guard_impl2(Obj& obj,MemFun mem_fun,P1 p1,P2 p2):
|
|
obj_(obj),mem_fun_(mem_fun),p1_(p1),p2_(p2)
|
|
{}
|
|
~obj_scope_guard_impl2(){scope_guard_impl_base::safe_execute(*this);}
|
|
void execute(){(obj_.*mem_fun_)(p1_,p2_);}
|
|
|
|
protected:
|
|
Obj& obj_;
|
|
MemFun mem_fun_;
|
|
const P1 p1_;
|
|
const P2 p2_;
|
|
};
|
|
|
|
template<class Obj,typename MemFun,typename P1,typename P2>
|
|
inline obj_scope_guard_impl2<Obj,MemFun,P1,P2>
|
|
make_obj_guard(Obj& obj,MemFun mem_fun,P1 p1,P2 p2)
|
|
{
|
|
return obj_scope_guard_impl2<Obj,MemFun,P1,P2>(obj,mem_fun,p1,p2);
|
|
}
|
|
|
|
template<class Obj,typename MemFun,typename P1,typename P2,typename P3>
|
|
class obj_scope_guard_impl3:public scope_guard_impl_base
|
|
{
|
|
public:
|
|
obj_scope_guard_impl3(Obj& obj,MemFun mem_fun,P1 p1,P2 p2,P3 p3):
|
|
obj_(obj),mem_fun_(mem_fun),p1_(p1),p2_(p2),p3_(p3)
|
|
{}
|
|
~obj_scope_guard_impl3(){scope_guard_impl_base::safe_execute(*this);}
|
|
void execute(){(obj_.*mem_fun_)(p1_,p2_,p3_);}
|
|
|
|
protected:
|
|
Obj& obj_;
|
|
MemFun mem_fun_;
|
|
const P1 p1_;
|
|
const P2 p2_;
|
|
const P3 p3_;
|
|
};
|
|
|
|
template<class Obj,typename MemFun,typename P1,typename P2,typename P3>
|
|
inline obj_scope_guard_impl3<Obj,MemFun,P1,P2,P3>
|
|
make_obj_guard(Obj& obj,MemFun mem_fun,P1 p1,P2 p2,P3 p3)
|
|
{
|
|
return obj_scope_guard_impl3<Obj,MemFun,P1,P2,P3>(obj,mem_fun,p1,p2,p3);
|
|
}
|
|
|
|
} /* namespace multi_index::detail */
|
|
|
|
} /* namespace multi_index */
|
|
|
|
} /* namespace boost */
|
|
|
|
#endif
|