Coroutine.h

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/*
    MetaImGUI
    Copyright (C) 2026  A P Nicholson
 
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.
 
    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.
 
    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <https://www.gnu.org/licenses/>.
*/
 
#pragma once
 
#include <coroutine>
#include <exception>
 
namespace MetaImGUI {
 
struct Task {
    struct promise_type {
        Task get_return_object() noexcept {
            return {};
        }
        std::suspend_never initial_suspend() noexcept {
            return {};
        }
        std::suspend_never final_suspend() noexcept {
            return {};
        }
        void return_void() noexcept {}
        void unhandled_exception() noexcept {
            // UI-thread coroutines should not throw — terminate so the bug
            // is loud rather than silently dropping the rest of the flow.
            std::terminate();
        }
    };
};
 
} // namespace MetaImGUI