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

From: Rubiphisto (snwcwt_at_[hidden])
Date: 2008-06-10 09:55:24

Thank you for your answer. boost::bind<int&>( &_sUserData::m_nUserAge, _1 ) is work good.
----- Original Message ----- 
From: "Peter Dimov" <pdimov_at_[hidden]>
Newsgroups: gmane.comp.lib.boost.user
To: <boost-users_at_[hidden]>
Sent: Thursday, June 05, 2008 4:33 AM
Subject: Re: A question about boost::bind function


>> 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? 
> 
>


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