Including dynamic_bitset while using BGL's boost::dynamic_properties forces operator>> into std namespace

[Thomas Krennwallner <tkren@…>]

Including dynamic_bitset.hpp (without using it) breaks previously working BGL code, which uses boost::dynamic_properties. We get the following error:

/opt/local/include/boost/lexical_cast.hpp:785: error: no match for 'operator>>' in 'stream >> output'

Wrapping my operator>> into namespace std fixes the compiler error.

I've created a rather "minimal" example which should confirm this (simply run g++ XXX.cpp):

• xxx.cpp: this is the version without dynamic_bitset and compiles
• yyy.cpp: a variant of xxx.cpp which includes dynamic_bitset; gives above compiler error
• zzz.cpp: this is a variant of yyy.cpp which compiles again

The problem can be reproduced in Boost 1.43.0 and in Boost trunk.

[Thomas Krennwallner <tkren@…>]

Working example without dynamic_bitset

[Thomas Krennwallner <tkren@…>]

Nonworking example with dynamic_bitset

[Thomas Krennwallner <tkren@…>]

Workaround

[Steven Watanabe]

yyy.cpp is incorrect. operator>> cannot be found by Argument Dependent Lookup. xxx.cpp only works because gcc doesn't implement two-phase name lookup perfectly.