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#define SOL_ALL_SAFETIES_ON 1
#include <sol/sol.hpp>
#include <iostream>
int main() {
std::cout << "=== protected_functions ===" << std::endl;
sol::state lua;
lua.open_libraries(sol::lib::base);
// A complicated function which can error out
// We define both in terms of Lua code
lua.script(R"(
function handler (message)
return "Handled this message: " .. message
end
function f (a)
if a < 0 then
error("negative number detected")
end
return a + 5
end
)");
// Get a protected function out of Lua
sol::protected_function f(lua["f"], lua["handler"]);
sol::protected_function_result result = f(-500);
if (result.valid()) {
// Call succeeded
int x = result;
std::cout << "call succeeded, result is " << x
<< std::endl;
}
else {
// Call failed
sol::error err = result;
std::string what = err.what();
std::cout << "call failed, sol::error::what() is "
<< what << std::endl;
// 'what' Should read
// "Handled this message: negative number detected"
}
std::cout << std::endl;
}
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