Issue 16405: Supporting automatic conversion from value types to delegate types (dds-psm-cxx-ftf)
Source: Real-Time Innovations (Dr. Sumant Tambe, sumant(at)rti.com)
Nature: Enhancement
Severity: Significant
Summary: Supporting some vendor-specific extension api is significantly easier using automatic conversion from value types to the delegate types. The situation arises when an extension method defined in the idds namespace takes a parameter defined only in the idds namespace. The parameter type may also be used as a delegate elsewhere. While the programmers can use the -> operator to invoke the extension method, the parameter need must be obtained using the delegate() method of the value type. It would be quite seamless to support automatic convertibility from value types to the delegate.


Proposed Solution:
Define two additional generic conversion operators in dds::core::Value<D> template.


operator D & () { return d_; }
operator const D & () const { return d_; } ;
Resolution: 
Revised Text: 
Actions taken:
July 29, 2011: received issue
Discussion: 

End of Annotations:=====

m: webmaster@omg.org
Date: 29 Jul 2011 21:15:18 -0400
To: <issues@omg.org>
Subject: Issue/Bug Report


*******************************************************************************
Name:            Sumant Tambe
Employer:        Real-Time Innovations
mailFrom:        sumant@rti.com
Terms_Agreement: I agree
Specification:   DDS C++ PSM
Section:         7
FormalNumber:    ptc/2011-01-02
Version:         Beta 1
Doc_Year:        2011
Doc_Month:       January
Doc_Day:         02
Page:            4
Title:           Supporting automatic conversion from value types to delegate types
Nature:          Enhancement
Severity:        Significant
CODE:            3TMw8
B1:              Report Issue


Description:


Supporting some vendor-specific extension api is significantly easier using automatic conversion from value types to the delegate types. The situation arises when an extension method defined in the idds namespace takes a parameter defined only in the idds namespace. The parameter type may also be used as a delegate elsewhere. While the programmers can use the -> operator to invoke the extension method, the parameter need must be obtained using the delegate() method of the value type. It would be quite seamless to support automatic convertibility from value types to the delegate.


Proposed Solution:
Define two additional generic conversion operators in dds::core::Value<D> template.


operator D & () { return d_; }
operator const D & () const { return d_; } ;