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Re: [v3] PATCH: PR 20599 (variadic templates, take two) (4/4)


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.


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