Поменять вывод в консоль на вывод в файл

auto support_message = [](std::ostream& out, std::string isa_feature, bool is_supported) {  
    return out << isa_feature
               << (is_supported ? " supported" : " not supported") << std::endl;  
};

Ну, а потом

ofstream log("Logfile",ios::ate);
support_message(cout,"feature",true);
support_message(log,"feature",true);

Примерно так.

Сделал вот так. Работает)

ofstream log("Logfile.txt");
auto support_message = [&log](std::string isa_feature, bool is_supported) {   log << isa_feature << (is_supported ? " supported" : " not supported") << std::endl;  };