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Re: [v3] PATCH: PR 20599 (variadic templates, take two) (4/4)
- From: Paolo Carlini <pcarlini at suse dot de>
- To: Douglas Gregor <doug dot gregor at gmail dot com>
- Cc: gcc-patches at gcc dot gnu dot org, libstdc++ <libstdc++ at gcc dot gnu dot org>
- Date: Wed, 20 Sep 2006 20:15:29 +0200
- Subject: Re: [v3] PATCH: PR 20599 (variadic templates, take two) (4/4)
- References: <5EB0664C-175A-432B-83D6-92A8FB72AC47@cs.indiana.edu>
Douglas Gregor wrote:
This is part 4 of 4. It contains changes to libstdc++'s TR1
implementation to make full use of variadic templates, eliminating
all of the preprocessor metaprogramming that we're using now.
+ // Define a large number of placeholders. There is no way to
+ // simplify this with variadic templates, because we're introducing
+ // unique names for each.
+ namespace placeholders { namespace {
+ _Placeholder<1> _1;
+ _Placeholder<2> _2;
+ _Placeholder<3> _3;
+ _Placeholder<4> _4;
+ _Placeholder<5> _5;
+ _Placeholder<6> _6;
+ _Placeholder<7> _7;
+ _Placeholder<8> _8;
+ _Placeholder<9> _9;
+ _Placeholder<10> _10;
+ _Placeholder<11> _11;
+ _Placeholder<12> _12;
+ _Placeholder<13> _13;
+ _Placeholder<14> _14;
+ _Placeholder<15> _15;
+ _Placeholder<16> _16;
+ _Placeholder<17> _17;
+ _Placeholder<18> _18;
+ _Placeholder<19> _19;
+ _Placeholder<20> _20;
+ _Placeholder<21> _21;
+ _Placeholder<22> _22;
+ _Placeholder<23> _23;
+ _Placeholder<24> _24;
+ _Placeholder<25> _25;
+ _Placeholder<26> _26;
+ _Placeholder<27> _27;
+ _Placeholder<28> _28;
+ _Placeholder<29> _29;
+ } }
Certainly a minor nit, but I'm curious about this issue: are there any
concrete plans to address it? Seems strange to have it in the final
standard, I never saw something similar before...
Paolo.