/tmp/cc7aOuV6.o: In function `main':
main.cpp:(.text+0x5e8): undefined reference to `Set::Set()'
/tmp/cc7aOuV6.o: In function `Set::Intersection(Set const&) const':
main.cpp:(.text._ZNK3Set12IntersectionERKS_[_ZNK3Set12IntersectionERKS_]+0xc4): undefined reference to `Set::Set()'
/tmp/cc7aOuV6.o: In function `Set::Difference(Set const&) const':
main.cpp:(.text._ZNK3Set10DifferenceERKS_[_ZNK3Set10DifferenceERKS_]+0xc4): undefined reference to `Set::Set()'
/tmp/cc7aOuV6.o: In function `Set::SymmetricDifference(Set const&) const':
main.cpp:(.text._ZNK3Set19SymmetricDifferenceERKS_[_ZNK3Set19SymmetricDifferenceERKS_]+0x10d): undefined reference to `Set::Set()'
main.cpp:(.text._ZNK3Set19SymmetricDifferenceERKS_[_ZNK3Set19SymmetricDifferenceERKS_]+0x11c): undefined reference to `Set::Set()'
/tmp/cc7aOuV6.o:main.cpp:(.text._ZNK3Set19SymmetricDifferenceERKS_[_ZNK3Set19SymmetricDifferenceERKS_]+0x12b): more undefined references to `Set::Set()' follow
collect2: error: ld returned 1 exit status
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