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Perhaps you mean for the class G2O_CORE_API to inherit from the class HyperGraph? I'm definitely no expert in C++, but I've never seen that syntax before. If you do mean to extend HyperGraph, use a colon to specify classes from which to inherit. Like this:

class G2O_Core_API : HyperGraph {

If you didn't mean to inherit, I'd sure like to know what the syntax is and how to use it!

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