round_robin.hpp

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#pragma once
 
#include <cstddef>
 
class RoundRobin {
  public:
    RoundRobin() : _lo{0}, _hi{0}, _cur{0} {}
 
    explicit RoundRobin(std::size_t hi) : RoundRobin{0, hi} {}
 
    RoundRobin(std::size_t lo, std::size_t hi) : _lo{lo}, _hi{hi}, _cur{hi - 1} {}
 
    auto next() -> std::size_t {
        if (++this->_cur == this->_hi) {
            this->_cur = this->_lo;
        }
        return this->_cur;
    }
 
  private:
    std::size_t _lo;
    std::size_t _hi;
    std::size_t _cur;
};