Re: [Boost-users] boost::lambda question

11 Mar 2006

      Hi Nat,

I tried that, and it still fails.  I *think* it is because DeleteFileW is 
defined as a WINAPI function (or "__stdcall").

For example, using boost::bind, the following will work:

void Delete(const wchar_t* filename)
{
 ::DeleteFile(filename);
}
...
for_each(v.begin(), v.end(), bind(&Delete, bind(&wstring::c_str, _1)));

However, the following fails:

for_each(v.begin(), v.end(), bind(&::DeleteFileW, bind(&wstring::c_str, 
_1)));

with:

c:\boost\include\boost-1_33_1\boost\bind.hpp(63) : error C2825: 'F': must be 
a class or namespace when followed by '::'
        c:\boost\include\boost-1_33_1\boost\bind\bind_template.hpp(15) : see 
reference to class template instantiation 'boost::_bi::result_traits' 
being compiled
        with
        [
            R=boost::_bi::unspecified,
            F=int (__stdcall *)(LPCWSTR)
        ]
        c:\tmp\boost\boost\boost.cpp(46) : see reference to class template 
instantiation 'boost::_bi::bind_t' being compiled
        with
        [
            R=boost::_bi::unspecified,
            F=BOOL (__stdcall *)(LPCWSTR),
            L=boost::_bi::list1,std::allocator>>,boost::_bi::list1>>>
        ]
c:\boost\include\boost-1_33_1\boost\bind.hpp(63) : error C2039: 
'result_type' : is not a member of '`global namespace''
c:\boost\include\boost-1_33_1\boost\bind.hpp(63) : error C2146: syntax error 
: missing ';' before identifier 'type'
c:\boost\include\boost-1_33_1\boost\bind.hpp(63) : error C2208: 
'boost::_bi::type' : no members defined using this type
c:\boost\include\boost-1_33_1\boost\bind.hpp(63) : fatal error C1903: unable 
to recover from previous error(s); stopping compilation

"Nat Goodspeed"  wrote in message 
news:ED67712627032740B15C91998D43FB4C0242C9AE@corp-mail4.solidworks.swk...
...
...
-----Original Message-----
From: boost-users-bounces@lists.boost.org [mailto:boost-users-
bounces@lists.boost.org] On Behalf Of Rob Caldecott
Sent: Saturday, March 11, 2006 12:36 PM
To: boost-users@lists.boost.org
Subject: Re: [Boost-users] boost::lambda question
Thanks Sebastian, but I am still struggling to make this work.  I now
get
the following error:
"error C2664: 'DeleteFileW' : cannot convert parameter 1 from 'const
boost::lambda::lambda_functor<T>' to 'LPCWSTR'"
[Nat] Don't you have to bind DeleteFileW as well? Something like
(untested):
for_each(v.begin(), v.end(), bind(::DeleteFileW,
                                 bind(&wstring::c_str, _1)));
I think this phrasing should work with either boost::lambda::bind or
boost::bind.