Re: [Boost-users] [bind][make_shared] compilation failure with ref arg

Subject: Re: [Boost-users] [bind][make_shared] compilation failure with ref arg
From: Jeff Flinn (TriumphSprint2000_at_[hidden])
Date: 2010-01-25 09:22:40

Peter Dimov wrote:
> Jeff Flinn wrote:
>> The last statement below fails to compile with boost 1.39.0 on MSVC 8.
>> Am I doing anything obviously wrong? Any help is appreciated.
> 
> ...
> 
>>     boost::bind(&boost::make_shared<Y, int&>, boost::ref(i));
> 
> Under C++03 compilers, make_shared takes its arguments by const reference:
> 
> template<class T, class A1>
>    shared_ptr<T> make_shared( A1 const & a1 );
> 
> MSVC doesn't like the A1=int& case because it forms the questionably 
> valid "int& const&".
> 
> boost::bind(
>    &boost::make_shared<Y, boost::reference_wrapper<int> >,
>    boost::ref(i) );
> 
> works though. This is what make_shared<Y>( ref(i) ) would instantiate.

Ah, thanks Peter!

Jeff