RE: [Boost-Users] tuple and enums

From: Tom Matelich (tmatelich_at_[hidden])
Date: 2002-08-29 10:32:15

Hello Jaakko,

Thanks for replying. It works if the constructor is written 
cons() {}

Is there any purpose to putting those default calls there?

Tom

> From: Jaakko Jarvi [mailto:jajarvi_at_[hidden]]
> Sent: Thursday, August 29, 2002 8:16 AM
> 
> Hi Tom, 
> 
> Your code compiles fine with gcc 3.x and icc 6 (linux), so it may just
> be gcc 2.96 problem.
> 
> Cheers, Jaakko
> 
> On Wed, 28 Aug 2002, Tom Matelich wrote:
> 
> > It appears that an enum cannot be default constructed in 
> the way that
> > tuple
> > does,
> > cons() : head(), tail() {}
> > 
> > Any idea on how to get around this (besides using an int in 
> the tuple)?
> > 
> > Thanks,
> > Tom
> > 
> > 
> > <sample_code>
> > 
> > #include <boost/tuple/tuple.hpp>
> > #include <string>
> > 
> > enum Foo { Willis, Arnold };
> > 
> > void test()
> > {
> >       boost::tuple<Foo, std::string> a;
> > }
> > 
> > </sample_code>
> > 
> > </error compiler="gcc version 2.96 20000731 (Mandrake Linux 8.2)">
> > 
> > 
> /usr/local/eddynet/opt/include/boost/tuple/detail/tuple_basic.hpp: In
> > method
> > `boost::tuples::cons<HT,
> > TT>::cons () [with HT = Foo, TT = boost::tuples::cons<string,
> > boost::tuples::null_type>]':
> > 
> /usr/local/eddynet/opt/include/boost/tuple/detail/tuple_basic.hpp:454:
> > instantiated from `boost::tuples::tuple<T0, T1, T2, T3, T4, 
> T5, T6, T7,
> > T8,
> > T9>::tuple () [with T0 = Foo, T1 = string, T2 =
> > boost::tuples::null_type, T3
> > = boost::tuples::null_type, T4 = boost::tuples::null_type, T5 =
> > boost::tuples::null_type, T6 = boost::tuples::null_type, T7 =
> > boost::tuples::null_type, T8 = boost::tuples::null_type, T9 =
> > boost::tuples::null_type]'
> > tuple_enum_test.cpp:8:   instantiated from here
> > 
> /usr/local/eddynet/opt/include/boost/tuple/detail/tuple_basic.hpp:263:
> > cannot convert `int' to `Foo' in
> > assignment
> > 
> > </error>
> > 
> > 
> > 
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-- 
--
-- Jaakko Järvi                       email: jajarvi_at_[hidden]
-- Post Doctoral Fellow               phone: [phone]
-- Pervasive Technology Labs          fax:   [phone]
-- Indiana University, Bloomington
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