Stream operator overload for thread::id fails because thread::id::print() is not const.

[David Larsson <david.larsson@…>]

In Boost 1.44.0 the implementation of operator<<( basic_stream &, thread::id const & ) changed when BOOST_NO_MEMBER_TEMPLATE_FRIENDS is defined to call a new member function print(). However, thread::id::print() is not const, so the following (admittedly silly) code fragment will not compile:

std::cout << thread::current_thread::id() << std::endl;

On VC8 it fails with the error boost/thread/detail/thread.hpp(473) : error C2662: 'std::basic_ostream<_Elem,_Traits> &boost::thread::id::print<char,std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &)' : cannot convert 'this' pointer from 'const boost::thread::id' to 'boost::thread::id &.

The fix should be trivial - simply add a const modifier to boost::id::print. On a related note, it seems a bit strange that the public method print() only is defined for legacy compilers that have BOOST_NO_MEMBER_TEMPLATE_FRIENDS. It should be private or exist for all compilers. Finally, the code that failed is a workaround that is enabled for VC8 and earlier, but the stream operator worked for thread::id on VC8 before the workaround in Boost 1.43. Is it really necessary to define BOOST_NO_MEMBER_TEMPLATE_FRIENDS for VC8 (VS2005)?

Thanks for a great library,

/ David

[David Larsson <david.larsson@…>]

Repro case

[David Larsson <david.larsson@…>]

Right after submitting, I noticed that this is a dupe for #4562 from a few hours ago.

[Reto Grieder <retogrieder@…>]

I was curious too why the workaround whould be defined for VC8, but I guess there are situations where VC8 doesn't behave well.

Linked your ticket to mine.

[David Larsson <david.larsson@…>]

I know friend declarations were broken in VC6, but I haven't noticed any problems with them in VC8. It would be interesting to hear what the problem really is about. In the case of thead::id, the operator overload worked in VC8 before.

[Anthony Williams]

Fixed on trunk, revision 62804

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