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Document number: N3559

Date: 2013-03-17

Proposal for Generic (Polymorphic) Lambda Expressions (Revision 2)

by Faisal Vali, Herb Sutter, Dave Abrahams

Excerpt:

This document revises N3418: Proposal for Generic (Polymorphic) Lambda Expressions and incorporates feedback from the Evolution Working Group (Portland, October 2012). In this revision we propose the two features that received no opposing votes from the EWG (with the other features described in a separate document). Specifically, we propose that auto be required in a lambda-expression's parameter-declaration-clause to identify a generic lambda; and that a generic lambda with no lambda-captures contain a conversion function template to an appropriate pointer-to-function. After a brief discussion of the features (with details deferred to the Appendices), we describe standard wording. All the features proposed in this document have been implemented using clang.