[Boost-users] Re: MPL Question on crossing the compile \ runtime barrier with bind | adding to boost profiler abstracted file access

"Brian Braatz" <brianb@rmtg.com> writes:

I can always pass in a functor, but what I really want for Christmas is to be able to

Tyepdef MyClass<std::ofstream, bind(&std::ofstream::open,_1,"MyFile.txt") > MyNewClass;

This doesn't work because bind returns an actual OBJECT instead of a type. (intuitively - it would be cool if I could say bind(...)::Type which would give me the TYPE of the generated functor)

SO that led me to be up until 3 am reading about mpl::lambda. I am still trying to determine if THAT can be used in place, but the dots are not connecting for me yet.

Any suggestions or directions pointed GREATLY appreciated.

You want "typeof," a mythical operator not yet in the C++ language -- but many implementations support some form of it as an extension. There's a prototype typeof library in the Sandbox files area now, by Arkadiy Vertleyb and others. Check it out. I suggest you browse the recent thread on typeof in boost-devel as well. -- Dave Abrahams Boost Consulting www.boost-consulting.com