[boost] Re: Simple shared_ptr assignment produces no executable code

From: Freer, David (Dave_Freer_at_[hidden])
Date: 2002-06-13 08:40:50

Boost 1.28.0 fixes this.  Never mind.

"David Freer" <dave_freer_at_[hidden]> wrote in message
news:<ae87am$8cg$1_at_[hidden]>...
> The following simple code produces no executable code with MSVC 6 SP4
using
> the boost shared pointer.  Any Ideas?
> 
> class dog
> {
>     public:
>         int hairless;
>         double weight;
> };
> 
> 
> void somefunction()
> {
>     typedef boost::shared_ptr<dog> t_spDog;
>     t_spDog toby( new dog ); // ok
>     toby = new dog; // this line produces no warnings but no executable
code
> as well.
>     toby = t_spDog( new dog ); // ok
> }
> 
> Disassembly while debugging -
> 148: t_spDog toby( new dog );
> 00402134 movsx edx,word ptr [__LINE__Var (004185c8)]
> 0040213B add edx,0Eh
> 0040213E push edx
> 0040213F push offset THIS_FILE (00418520)
> 00402144 push 10h
> 00402146 call operator new (00404680)
> 0040214B add esp,0Ch
> 0040214E mov dword ptr [ebp-1Ch],eax
> 00402151 mov eax,dword ptr [ebp-1Ch]
> 00402154 push eax
> 00402155 lea ecx,[toby]
> 00402158 call @ILT+495(boost::shared_ptr<dog>::shared_ptr<dog>) (004011f4)
> 0040215D mov dword ptr [ebp-4],0
> 149:
> 150: toby = new dog;
> 151:
> 152: toby = t_spDog( new dog );
> 00402164 movsx ecx,word ptr [__LINE__Var (004185c8)]
> 0040216B add ecx,12h
> 0040216E push ecx
> 0040216F push offset THIS_FILE (00418520)
> 00402174 push 10h
> 00402176 call operator new (00404680)
> 0040217B add esp,0Ch
> 0040217E mov dword ptr [ebp-28h],eax
> 00402181 mov edx,dword ptr [ebp-28h]
> 00402184 push edx
> 00402185 lea ecx,[ebp-24h]
> 00402188 call @ILT+495(boost::shared_ptr<dog>::shared_ptr<dog>) (004011f4)
> 0040218D mov dword ptr [ebp-2Ch],eax
> 00402190 mov eax,dword ptr [ebp-2Ch]
> 00402193 mov dword ptr [ebp-30h],eax
> 00402196 mov byte ptr [ebp-4],1
> 0040219A mov ecx,dword ptr [ebp-30h]
> 0040219D push ecx
> 0040219E lea ecx,[toby]
> 004021A1 call @ILT+155(boost::shared_ptr<dog>::operator=) (004010a0)
> 004021A6 mov byte ptr [ebp-4],0
> 004021AA lea ecx,[ebp-24h]
> 004021AD call @ILT+130(boost::shared_ptr<dog>::~shared_ptr<dog>)
(00401087)
> 
> 
> 
> 
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