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Calling a pure virtual function

Calling a pure virtual function is illegal. If your code calls a pure virtual function, then the compiler includes a call to the library function __cxa_pure_virtual.

__cxa_pure_virtual raises the signal SIGPVFN. The default signal handler prints an error message and exits. See __default_signal_handler() in the ARM® C and C++ Libraries and Floating-Point Support Reference for more information.