TestFunctions.o: In function `test7()':
/in/compile/TestFunctions.cpp:135: undefined reference to `BinaryTree::operator=(BinaryTree const&)'
TestFunctions.o: In function `test11()':
/in/compile/TestFunctions.cpp:184: undefined reference to `BinaryTree::operator=(BinaryTree const&)'
TestFunctions.o: In function `test12()':
/in/compile/TestFunctions.cpp:195: undefined reference to `BinaryTree::operator=(BinaryTree const&)'
TestFunctions.o: In function `test14()':
/in/compile/TestFunctions.cpp:215: undefined reference to `BinaryTree::operator=(BinaryTree const&)'
TestFunctions.o: In function `test15()':
/in/compile/TestFunctions.cpp:226: undefined reference to `BinaryTree::operator=(BinaryTree const&)'
TestFunctions.o:/in/compile/TestFunctions.cpp:306: more undefined references to `BinaryTree::operator=(BinaryTree const&)' follow
collect2: error: ld returned 1 exit status
/in/compile/Makefile:17: recipe for target 'test' failed
make: *** [test] Error 1