365 int step_function_plus(int previous, double step) {  in step_function_plus()  argument
366     return static_cast<int>(previous + step);  in step_function_plus()
368 int step_function_multiply(int previous, double multiply) {  in step_function_multiply()  argument
369     return static_cast<int>(previous * multiply);  in step_function_multiply()
374 int step_function_power2_ladder(int previous, double nsteps) {  in step_function_power2_ladder()  argument
378     if (previous < 2 * steps)  in step_function_power2_ladder()
379         return previous + 1;  in step_function_power2_ladder()
381     int prev_power2 = previous / 2; // start with half the given value  in step_function_power2_ladder()
390     assert((prev_power2 <= previous) && (2 * prev_power2 > previous));  in step_function_power2_ladder()
392     return previous + (prev_power2 / steps);  in step_function_power2_ladder()
430     int operator()(int previous) const {  in operator ()()
431         assert(0 <= previous); // test 0<=first and loop discipline  in operator ()()
432         const int ret = step_function(previous, step_function_argument);  in operator ()()
433         assert(previous < ret);  in operator ()()