functional.hpp

#pragma once


#include <cstddef>


template<typename Lambda>
constexpr inline auto by_index(
        std::size_t const start_index,
        std::size_t const max_index,
        Lambda &&lambda) {
    for (std::size_t index{start_index}; index < max_index; ++index) {
        lambda(index);
    }
}
template<typename Lambda>
constexpr inline auto by_index(std::size_t const max_index, Lambda &&lambda) {
    return by_index({}, max_index, std::forward<Lambda>(lambda));
}