First off, I know I shouldn't be using Visual Studio 6's STL libraries for any type of decent code, but that's a moot point right now. The problem is that I occasionally get this compiler error: c:\program files\microsoft visual studio\vc98\include\xutility(88) : error C2678: binary '==' : no operator defined which takes a left-hand operand of type 'const struct CPoly' (or there is no acceptable conversion) c:\program files\microsoft visual studio\vc98\include\xutility(30) : see reference to function template instantiation 'struct std::pair<struct CPoly const *,struct CPoly const *> __cdecl std::mismatch(const struct CPoly *,const struct CPoly *,const struct CPoly *)' being compiled And it only seems to happen when I define a structure like such: struct Bar { std::vector<float> m_vFloat; } struct Foo { std::vector<Bar> m_vBars; }; And since it's a templated error, it's nigh impossible to pinpoint where it's happening, and it's driving me up the wall. Do you guys have any suggestions? Thanks a lot.

Ah, but there's the thing: I'm not calling std::mismatch...-anywhere-.

That's what's flummoxed me the most.

And I don't see how it could be calling indirectly... all I'm doing are standard accessor operations with the vectors.

Okay, ridiculously enough, defining an == operator made it compile.

I'm still a little miffed at why this was happening, though.

Hmm...I could be.

It's getting late though, so I'll look it over tomorrow.

Thanks a lot though for being so swift to reply and helpful. Cheers!

rate++!