ClockFollowMe:
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sc_clock s a predefined primitive channel derived from the class sc_signal and intended to model the behavior of a digital clock signal. 
The value and events associated with the clock are accessed through the interface sc_signal_in_if<bool>.

Constructor:
sc_clock(
  constchar*name_, // unique module name
  double period_v_, // the time interval between two consecutive transitions from false to true, also equal to the time interval between two consecutive transitions from true to false. Greater than zero, default is 1 nanosecond.
  sc_time_unit period_tu_, // time unit, used for period
  double duty_cycle_, // the proportion of the period during which the clock has the value true. Between 0.0 and 1.0, exclusive. Default is 0.5.
  double start_time_v_, // the absolute time of the first transition of the value of the clock (false to true or true to false). Default is zero.
  sc_time_unit start_time_tu_,
  bool posedge_first_ = true ); // if true, the clock is initialized to false, and changes to true at the start time. Vice versa. Default is true.
run
Learn with Examples, 2020, MIT license
#include <systemc>
using namespace sc_core;
SC_MODULE(CLOCK) {
a port to access clock
  sc_port<sc_signal_in_if<bool>> clk;
  SC_CTOR(CLOCK) {
register a thread process
    SC_THREAD(thread);
sensitive to clock
    sensitive << clk;
    dont_initialize();
  }
  void thread() {
    while (true) {
print current clock value
      std::cout << sc_time_stamp() << ", value = " << clk->read() << std::endl;
wait for next clock value change
      wait();
    }
  }
};
int sc_main(int, char*[]) {
10s period, 2s true, 8s false, start at 10s, start at false.
  sc_clock clk("clk", 10, SC_SEC, 0.2, 10, SC_SEC, false);
instantiate module
  CLOCK clock("clock");
bind port
  clock.clk(clk);
run simulation for 31 s
  sc_start(31, SC_SEC);
  return 0;
}
Result:
clk starts to run at 10 s, init value is false
10 s, value = 0
false to true after 8 s
18 s, value = 1
true to false after 2 s; total period = 10 s
20 s, value = 0
repeat false to true
28 s, value = 1
repeat true to false
30 s, value = 0
⇦ Customized Data Type     Process: CTHREAD ⇨