AMDG Jeremiah Willcock wrote:
There are a lot of BGL overloads of get; it is intended to be found by ADL, and there's (at least) one definition for each graph type. The graph library's get has been around for a while. It is not globally reserved, at least not technically; it only applies to known graph and property map types, just like variant's. The problem is that variant's get takes explicit template arguments and that seems to make the overloading work incorrectly. I suspect that the error in this thread, for example, is coming from the boost::get version for two_bit_color_map; that function is restricted to work on only that property map type but instantiating its signature appears to be failing without SFINAE because of the explicit template argument.
SFINAE doesn't apply for this overload of get.
I think this is something that's fixed in C++0x but that doesn't help us now. Your workaround might fix the common cases though (since the compiler seems to differentiate functions based on the number of template arguments given); for some reason, the extra template argument in ::key_type is important in that definition of get. It will be annoying to have to work around this issue repeatedly, though.
Property maps that use put_get_helper seem to be okay. In Christ, Steven Watanabe