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// Copyright (C) 2024 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
#pragma once
#include <sol/sol.hpp>
namespace Lua::Async {
/*!
\brief Start an async function.
To run an async function, you need to provide a callback function that will be called when the
async function is done. The callback function will receive the return value of the function.
\code
local Utils = require("Utils")
local a = require("async")
local function foo()
print("Waiting 1 second ...")
a.wait(Utils.waitms(1000))
print("Done")
return "done"
end
\endcode
\code
sol::function foo = lua["foo"];
::Lua::Async::start(foo, [](const QString &result) {
// Will be called after one second.
qDebug() << "Result:" << result;
});
\endcode
*/
template<class... Args>
inline void start(sol::function func, std::function<void(Args...)> callback)
{
sol::state_view lua = func.lua_state();
sol::protected_function start = lua.script(R"(
local co = coroutine
return function(func, callback)
assert(type(func) == "function", "type error :: expected func")
local thread = co.create(func)
local step = nil
step = function(...)
local stat, ret = co.resume(thread, ...)
if not stat then
print(ret)
print(debug.traceback(thread))
end
assert(stat, ret)
if co.status(thread) == "dead" then
(callback or function() end)(ret)
else
assert(type(ret) == "function", "type error :: expected func")
ret(step)
end
end
step()
end
)");
start(func, callback);
}
} // namespace Lua::Async
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