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gast128@hotmail.com
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 Posted: Wed Jun 21, 2006 2:53 pm Post subject: Destruction of local before return value |
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Dear all,
Probably already discussed before, but consider this:
struct KLock
{
KLock(KCriticalSection& r)
: m_r(r)
{
m_r.Lock();
}
~KLock()
{
m_r.Unlock();
}
private: //data
KCriticalSection& m_r;
};
struct KBla
{};
struct KFoo
{
KBla Get();
private: //data
mutable KCriticalSection m_cs;
KBla m_bla;
};
KBla KFoo::Get() const
{
KLock lock(m_cs);
return m_bla;
}
The KLock class locks the critical section on construction and unlocks
on destruction. However if the destructor of a local is called before
copying the return value, the copying is not proctected. Does any one
know the order or is this unspecified. Or even implementation defined
due to the 'return value optimization'?
Wkr,
me
[ See http://www.gotw.ca/resources/clcm.htm for info about ]
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dan2online
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| Posted: Fri Jun 23, 2006 3:12 pm Post subject: Re: Destruction of local before return value |
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gast128 (AT) hotmail (DOT) com wrote:
| Quote: | Dear all,
Probably already discussed before, but consider this:
struct KLock
{
KLock(KCriticalSection& r)
: m_r(r)
{
m_r.Lock();
}
~KLock()
{
m_r.Unlock();
}
private: //data
KCriticalSection& m_r;
};
struct KBla
{};
struct KFoo
{
KBla Get();
private: //data
mutable KCriticalSection m_cs;
KBla m_bla;
};
KBla KFoo::Get() const
{
KLock lock(m_cs);
return m_bla;
}
The KLock class locks the critical section on construction and unlocks
on destruction. However if the destructor of a local is called before
copying the return value, the copying is not proctected. Does any one
|
the copying always is called before the destructor call in the function
epilogue that appears at the end of the function.
[ See http://www.gotw.ca/resources/clcm.htm for info about ]
[ comp.lang.c++.moderated. First time posters: Do this! ] |
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