Debug on pure method is called

#include <iostream>
#include <execinfo.h> //for  backtrace
void dump(void)
{
    int j, nptrs;
    void *buffer[kBacktraceSize];
    char **strings;
    nptrs = backtrace(buffer, kBacktraceSize);
    printf("backtrace() returned %d addresses\n", nptrs);

    strings = backtrace_symbols(buffer, nptrs);
    if (strings == NULL) {
        perror("backtrace_symbols");
        exit(EXIT_FAILURE);
    }
    for (j = 0; j < nptrs; j++)
        printf("[%02d] %s\n", j, strings[j]);

    free(strings);
}
extern "C"
void __cxa_pure_virtual () {
  std::cout<<"pure method is called"<<std::endl;
  dump();
}

 Copy the above code in your own project. When the pure method is called, the dump will output some backtrace. The output hint may be helpful to let you figure out what is wrong.

Reference
[1] C++ 错误 pure virtual method called
[2] “Pure virtual function call”如何调试