What does ::* mean in C++?

Question

What does

 private:
    BOOL (LASreader::*read_simple)();

mean?

It\'s from LAStools, in lasreader.hpp

BOOL is a

Answer 1

BOOL (LASreader::*read_simple)();

read_simple is a pointer to a member function of class LASreader that takes no arguments and returns a BOOL.