I’m converting this code that uses Lewis Baker’s cppcoro library to use Boost.Cobalt

#include <cppcoro/generator.hpp>

#include <iostream>
#include <fstream>
#include <string>

cppcoro::generator<std::string> read_script_file(std::ifstream& script)
{
    std::string line;
    while (std::getline(script, line)) {
        if (line.empty()) {
            continue;
        }
        if (line[0] == '#') {
            continue;
        }
        co_yield line;
    }
}

void print_script_file()
{
    std::ifstream ifs("script");

    for (const auto line : read_script_file(ifs)) {
        std::cout << line << "n";
    }
}

And this is the Boost.Cobalt version:

#include <boost/cobalt.hpp>

#include <fstream>
#include <iostream>
#include <string>

boost::cobalt::generator<std::string> read_script_file(std::ifstream& script)
{
    std::string line;
    while (std::getline(script, line)) {
        boost::algorithm::trim(line);
        if (line.empty()) {
            continue;
        }
        if (line[0] == '#') {
            continue;
        }
        co_yield line;
    }
    co_return "--exit";
}

void print_script_file()
{
    std::ifstream ifs("script");

    while (true) {
        const auto line = co_await read_script_file(ifs);
        if (line == "--exit") {
            break;
        }
        std::cout << line << "n";
    }
}

The cppcoro version is much more elegant as it doesn’t need to return a “–exit” string to finish the
generator.
Is there a better way to write the Boost.Cobalt version?

[1] cppcoro – https://github.com/lewissbaker/cppcoro

[2] Boost.Cobalt – https://github.com/boostorg/cobalt