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#define SOL_ALL_SAFETIES_ON 1
#include <sol/sol.hpp>
#include <iostream>
sol::variadic_results call_it(sol::object function_name,
sol::variadic_args args, sol::this_environment env,
sol::this_state L) {
sol::state_view lua = L;
// default to global table as environment
sol::environment function_environment = lua.globals();
if (env) {
// if we have an environment, use that instead
function_environment = env;
}
// get and call the function
sol::protected_function pf
= function_environment[function_name];
sol::protected_function_result res = pf(args);
//
sol::variadic_results results;
if (!res.valid()) {
// something went wrong: log/crash/whatever
return results;
}
int returncount = res.return_count();
for (int i = 0; i < returncount; i++) {
// pass offset to get the object that was returned
sol::object obj = res.get<sol::object>(i);
results.push_back(obj);
}
// return the results
return results;
}
int main(int, char*[]) {
std::cout << "=== indirect function calls ===" << std::endl;
sol::state lua;
lua.open_libraries(sol::lib::base);
lua["call_it"] = call_it;
// some functions to call
lua.script(R"(
function add (a, b)
return a + b;
end
function subtract (a, b)
return a - b;
end
function log (x)
print(x)
end
)");
// call the functions indirectly, using a name
lua.script(R"(
call_it("log", "hiyo")
call_it("log", 24)
subtract_result = call_it("subtract", 5, 1)
add_result = call_it("add", 5, 1)
)");
int subtract_result = lua["subtract_result"];
int add_result = lua["add_result"];
SOL_ASSERT(add_result == 6);
SOL_ASSERT(subtract_result == 4);
std::cout << std::endl;
return 0;
}
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