Re: [Boost-users] A question about boost::bind function

From: Peter Dimov (pdimov_at_[hidden])
Date: 2008-06-04 16:33:23

> void AddUserAge( int& age )
> {
>    ++age;
> }
>
> int _tmain(int argc, _TCHAR* argv[])
> {
>    std::vector<_sUserData> vUserData;
>    for( int i = 0; i < 10; ++i )
>        vUserData.push_back( _sUserData() );
>    std::for_each( vUserData.begin(), vUserData.end(), boost::bind( 
> AddUserAge, boost::bind( &_sUserData::m_nUserAge, _1 ) ) );
>    return 0;
> }

This compiles in 1.33, but doesn't actually increment the age; the inner 
bind returns a temporary int by value, and the outer bind increments that.

Can you please try boost::bind<int&>( &_sUserData::m_nUserAge, _1 ) and see 
if it helps?