New paper: N3701, Concepts Lite (2nd revision) -- A. Sutton, B. Stroustrup, G. Dos Reis

Note: This paper explores potential future standardization directions and alternatives. It does not discuss or propose to amend the C++14 Committee Draft paper whose ballot is currently in progress.


A new WG21 paper is available. A copy is linked below, and the paper will also appear in the next normal WG21 mailing. If you are not a committee member, please use the comments section below or the std-proposals forum for public discussion.

Document number: N3701

Date: 2013-06-28

Concepts Lite (2nd revision)

by A. Sutton, B. Stroustrup, G. Dos Reis


This paper is in its 2nd revision. There have been a number of substantial
changes, which are summarize here.

  • The syntax of constrained member functions has changed.
  • The syntax of the requires expression has changed.
  • We have introduced syntax for constraining generic lambdas, and using constraints wherever auto is used.
  • We allow the use of overload sets as arguments to constrained functions.
  • The standard wording has been more extensively developed, but does not yet include language for constrained generic lambdas.

This paper is organized like this:

  • Tutorial: introduces the new features specified by Concepts Lite, their core concepts and examples.
  • User’s guide: provides a more extensive discussion of the proposed features and demonstrates the completeness of the constraints mechanism. We also include some high-level discussion of the language mechanics.
  • Discussion: explains what constrains are not. In particular, we try to outline constraint’s relation to concepts and to dispel some common misconceptions about concepts.
  • Design Notes: Notes on the design of terse notation for templates and generic lambdas.
  • Language definition: presents a semi-formal definition of constraints

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Comments (3)

1 0

R. Martinho Fernandes said on Jul 2, 2013 10:19 AM:

The link to the paper is broken.
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gsomberg said on Jul 2, 2013 10:22 AM:

So it is... Here is the correct link:
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Blog Staff said on Jul 2, 2013 03:24 PM:

Link fixed. Hate when that happens.