Ctrl-Z Examples...

ctrl-z.cpp

// Copyright 2018 G. M. Beard
// 
// Permission is hereby granted, free of charge, to any person obtaining 
// a copy of this software and associated documentation files (the "Software"), 
// to deal in the Software without restriction, including without limitation 
// the rights to use, copy, modify, merge, publish, distribute, sublicense, 
// and/or sell copies of the Software, and to permit persons to whom the 
// Software is furnished to do so, subject to the following conditions:
// 
// The above copyright notice and this permission notice shall be included in 
// all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS 
// IN THE SOFTWARE.#include <iostream>

#include <vector>

constexpr auto REGRET = int { -1 };

namespace user {
    auto decision() -> int {
        return REGRET;
    }

    auto life_decisions() {
        return std::vector<int> { };
    }

    auto regrets(std::vector<int> const&) {
        return true;
    }

    auto has_any_regrets() -> bool {
        return true;
    }

    auto is_sure_about(int) {
        return false;
    }
}

enum class Signal {
    Ctrl_Z
};

auto send(Signal const&) { }

auto main() -> int {

    //  Example 1...
    auto life_decisions = user::life_decisions();
    if (user::regrets(life_decisions)) {
        send(Signal::Ctrl_Z);
    }

    //  Example 2...
    if (user::has_any_regrets()) {
        send(Signal::Ctrl_Z);
    }

    //  Example 3...
    if (user::decision() == REGRET) {
        send(Signal::Ctrl_Z);
    }
}