Re: [boost] [generic programming] header file for general "default" operations for C++ classes

Subject: Re: [boost] [generic programming] header file for general "default" operations for C++ classes
From: Andrey Semashev (andrey.semashev_at_[hidden])
Date: 2016-05-04 10:03:36

On Wednesday, 4 May 2016 17:01:49 MSK Walt Karas wrote:
> In C++, a default assignment operator is generated for a class if all of its
> components (data members and base classes) have an assignment operator. 
> There are plans in C++17 to do something similar for comparison operators. 
> This header, in
> https://github.com/wkaras/C-plus-plus-library-default-operators ,
> facilitates that, more generally, if there is an operation on all the
> components of a class, a single macro invocation can provide this operation
> on the class as well.  A big drawback is that it's very intrusive into the
> class definition.  Each class component must be defined using a macro,
> COMPOSITE_OP_MBR_T(int) i; for examle.  The class will in truth be a
> template, with the template parameter being defaulted for normal usage.  I
> don't know which, if any, existing Boot library this header would belong
> in.

I think, Boost.Fusion already provides this for all adapted types.

http://www.boost.org/doc/libs/1_60_0/libs/fusion/doc/html/fusion/sequence/
operator/comparison.html