Re: [Cppcms-users] Compilation errors using gcc 4.5 and c++0x

[Artyom <art...@ya...>]

Hello,

Small note - not 4.5 -- 4.4

To be honest, it looks like a compiler bug... Or I do not know C++.
The funniest thing that I did tested the code with gcc-4.5 and c++0x flag
and it worked well. (See http://cppcms.sourceforge.net/wikipp/en/page/cppcms_1x_platforms)

gcc-4.4 (that I fortunately have installed) fails on

   return buffer_data_type(0,0);

Where buffer_data_type is std:pair of <entry const *,size_t> and entry itself
defined as struct entry { Pointer ptr; size_t size; } where Pointer is template parameters.

Now gcc-4.4 complains that it can't convert 0 (int) to entry const *, where it is clearly (at least for me)
legal as I can assign 0 to pointer.

Now I fixed this in the code by creating empty buffer_data_type and manually setting first and second to 0.

But what I do interested is whether I'm wrong or compiler is wrong.

I've commited the fix in changeset 1296
You may take it from the svn or just apply these changes in your copy as shown there:

http://cppcms.svn.sourceforge.net/viewvc/cppcms/framework/branches/refactoring/booster/booster/aio/buffer.h?r1=1173&r2=1296

Thanks for the report,
  Artyom




----- Original Message ----
> From: Stanimir Mladenov <sta...@zo...>
> To: cpp...@li...
> Sent: Fri, June 25, 2010 2:28:48 PM
> Subject: [Cppcms-users] Compilation errors using gcc 4.5 and c++0x
> 
> Hello Artyom,

Congratulations for the beta release of CppCms 
> 1.x.x!

I am using the new features of gcc 4.4 and --std=c++0x

Here 
> are some compile errors from it.

[  1%] Building CXX 
> object
booster/CMakeFiles/booster.dir/lib/aio/src/socket.cpp.o
In file 
> included from /usr/include/c++/4.4/bits/stl_algobase.h:66,
    
>              from 
> /usr/include/c++/4.4/bits/char_traits.h:41,
        
>          from /usr/include/c++/4.4/string:42,
  
>                from 
> /usr/include/c++/4.4/stdexcept:39,
            
>     
> from
/home/stanimir/work/web_common/third_parties/cppcms/framework/branches/refactoring/booster/./booster/function.h:11,
  
>               
> from
/home/stanimir/work/web_common/third_parties/cppcms/framework/branches/refactoring/booster/./booster/aio/socket.h:12,
  
>               
> from
/home/stanimir/work/web_common/third_parties/cppcms/framework/branches/refactoring/booster/lib/aio/src/socket.cpp:28:
/usr/include/c++/4.4/bits/stl_pair.h: 
> In constructor ‘std::pair<_T1,
_T2>::pair(_U1&&, _U2&&) 
> [with _U1 = int, _U2 = int, _T1 = 
> const
booster::aio::buffer_impl<char*>::entry*, _T2 = unsigned 
> int]’:
/home/stanimir/work/web_common/third_parties/cppcms/framework/branches/refactoring/booster/./booster/aio/buffer.h:34:
  
> instantiated from 
> ‘std::pair<const
booster::aio::buffer_impl<Pointer>::entry*, 
> unsigned int>
booster::aio::buffer_impl<Pointer>::get() const [with 
> Pointer 
> =
char*]’
/home/stanimir/work/web_common/third_parties/cppcms/framework/branches/refactoring/booster/./booster/aio/buffer.h:77:
  
> instantiated from here
/usr/include/c++/4.4/bits/stl_pair.h:90: error: 
> invalid conversion
from ‘int’ to ‘const 
> booster::aio::buffer_impl<char*>::entry*’
/usr/include/c++/4.4/bits/stl_pair.h: 
> In constructor ‘std::pair<_T1,
_T2>::pair(_U1&&, _U2&&) 
> [with _U1 = int, _U2 = int, _T1 = const
booster::aio::buffer_impl<const 
> char*>::entry*, _T2 = unsigned 
> int]’:
/home/stanimir/work/web_common/third_parties/cppcms/framework/branches/refactoring/booster/./booster/aio/buffer.h:34:
  
> instantiated from 
> ‘std::pair<const
booster::aio::buffer_impl<Pointer>::entry*, 
> unsigned int>
booster::aio::buffer_impl<Pointer>::get() const [with 
> Pointer = 
> const
char*]’
/home/stanimir/work/web_common/third_parties/cppcms/framework/branches/refactoring/booster/lib/aio/src/socket.cpp:377:
  
> instantiated from here
/usr/include/c++/4.4/bits/stl_pair.h:90: error: 
> invalid conversion
from ‘int’ to ‘const booster::aio::buffer_impl<const 
> char*>::entry*’
/home/stanimir/work/web_common/third_parties/cppcms/framework/branches/refactoring/booster/./booster/system_error.h:
At 
> global 
> scope:
/home/stanimir/work/web_common/third_parties/cppcms/framework/branches/refactoring/booster/./booster/system_error.h:56:
warning: 
> ‘booster::system::posix_category’ defined but not used
make[2]: *** 
> [booster/CMakeFiles/booster.dir/lib/aio/src/socket.cpp.o] Error 1
make[1]: 
> *** [booster/CMakeFiles/booster.dir/all] Error 2
make: *** [all] Error 
> 2

Greetings,
Stanimir

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