Re: [Boost-users] Need help with Errors in boost MPL, tutorials

Subject: Re: [Boost-users] Need help with Errors in boost MPL, tutorials
From: Linh Ha (lha_at_[hidden])
Date: 2012-01-24 09:57:26

> Just on a first glance, looks like you're mistaking ::_1 (placeholder from
> Boost.Bind) for boost::mpl::_1 (placeholder from Boost.MPL). They're
> incompatible; try using the latter...?
>
> - Jeff

Thanks, Jeff !

It works. But then my next question is why they are different and 
somehow incompatible even-though are both placeholders. Why we keep two 
different place holder if they do exactly a same functionality.