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#define SOL_ALL_SAFTIES_ON 1
#include <sol/sol.hpp>
#include <iostream>
int main() {
const auto& co_lua_script = R"(
function loop()
while counter ~= 30
do
coroutine.yield(counter);
counter = counter + 1;
end
return counter
end
)";
sol::state lua;
lua.open_libraries(sol::lib::base, sol::lib::coroutine);
/*
lua.script_file("co.lua");
we load string directly rather than use a file
*/
lua.script(co_lua_script);
sol::coroutine loop_coroutine = lua["loop"];
// set counter variable in C++
// (can set it to something else to
// have loop_coroutine() yield different values)
lua["counter"] = 20;
// example of using and re-using coroutine
// you do not have to use coroutines in a loop,
// this is just the example
// we start from 0;
// we want 10 values, and we only want to
// run if the coroutine "loop_coroutine" is valid
for (int counter = 0; counter < 10 && loop_coroutine;
++counter) {
// Alternative: counter < 10 && cr.valid()
// Call the coroutine, does the computation and then
// suspends once it returns, we get the value back from
// the return and then can use it we can either leave
// the coroutine like that can come to it later, or
// loop back around
int value = loop_coroutine();
std::cout << "In C++: " << value << std::endl;
}
return 0;
}
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