Topic: rel_ops as a fallback for operator functors
Author: David Krauss <potswa@gmail.com>
Date: Fri, 14 Aug 2015 10:11:17 +0800
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Why shouldn=E2=80=99t the operator wrapper classes in <functional> use expr=
ession SFINAE and bring in namespace rel_ops when the wrapped definition is=
ill-formed? It would make the rel_ops functionality much more accessible, =
whereas currently in most cases it=E2=80=99s easier just to ignore rel_ops =
and write the boilerplate.
When rel_ops was conceived, expression SFINAE didn=E2=80=99t yet exist, and=
it was common to be more careless with namespaces.
The proposal isn=E2=80=99t a breaking change (to user libraries with SFINAE=
), since it only involves fixing ill-formed class template specializations.
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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html charset=
=3Dutf-8"></head><body style=3D"word-wrap: break-word; -webkit-nbsp-mode: s=
pace; -webkit-line-break: after-white-space;" class=3D"">Why shouldn=E2=80=
=99t the operator wrapper classes in <font face=3D"Courier" class=3D""><=
functional></font> use expression SFINAE and bring in <font face=3D"Cour=
ier" class=3D"">namespace rel_ops</font> when the wrapped definition is ill=
-formed? It would make the <font face=3D"Courier" class=3D"">rel_ops</font>=
functionality much more accessible, whereas currently in most cases it=E2=
=80=99s easier just to ignore <font face=3D"Courier" class=3D"">rel_ops</fo=
nt> and write the boilerplate.<div class=3D""><br class=3D""></div><div cla=
ss=3D"">When <font face=3D"Courier" class=3D"">rel_ops</font> was conceived=
, expression SFINAE didn=E2=80=99t yet exist, and it was common to be more =
careless with namespaces.</div><div class=3D""><br class=3D""></div><div cl=
ass=3D"">The proposal isn=E2=80=99t a breaking change (to user libraries wi=
th SFINAE), since it only involves fixing ill-formed class template special=
izations.</div><div class=3D""><br class=3D""></div></body></html>
<p></p>
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