Thanks Daniel, my mistake. On 3/26/07, Daniel <boost@poradnik-webmastera.com> wrote:

...

Date: Mon, 26 Mar 2007 11:24:08 -0400 From: "Christian Henning" <chhenning@gmail.com> Subject: [Boost-users] [bind] static array vs. pointer vector To: boost-users@lists.boost.org Message-ID: <949801310703260824n31c76204pcd63bb686169e15c@mail.gmail.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed

Hi there, I have posted this question last Friday, already. But maybe my example was too confusing. Here is a more simple example. Basically, I don't see what the big difference is when using boost::bind with a pointer vector ( std::vector<info*> ) and a static array of info.

Please consider the following code:

#include <string> #include <algorithm> #include <functional> #include <vector>

#include <boost/bind.hpp>

using namespace std; using namespace boost;

struct info { int a; string s; };

static info table[] = { { 16, "Hello" }, { 18, "Moin" } };

string& get_s( info* p ) { return p->s; }

int _tmain(int argc, _TCHAR* argv[]) { { vector<info*> v; find_if( v.begin(), v.end() , bind( equal_to<string>() , bind( &get_s, _1 ) , "Moin" )); }

{ find_if( &table[0], &table[0] + 2 , bind( equal_to<string>() , bind( &get_s, _1 ) , "Moin" ));

} }

The second find_if wont complie using MSVC 7.1. The errors are:

c:\boost\boost\bind.hpp(219) : error C2664: 'std::string &(info *)' : cannot convert parameter 1 from 'info' to 'info *' [snip]

Any ideas?

Christian

In 1st case, when you dereference vector<info*> iterator, you will get info* pointer. But in 2nd case, your iterator is info* pointer, so you get info object when you dereference it. This is also mentioned at beginning of error message - "cannot convert parameter 1 from 'info' to 'info *'". Therefore you should change your get_s() function to accept info (or info&), or your binding expression to convert info to info*.

Daniel

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