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#define SOL_ALL_SAFETIES_ON 1
#include <sol/sol.hpp>
#include <iostream>
void test_environment(std::string key, const sol::environment& env, const sol::state_view& lua) {
sol::optional<int> maybe_env_a = env[key];
sol::optional<int> maybe_global_a = lua[key];
if (maybe_global_a) {
std::cout << "\t'" << key << "' is " << maybe_global_a.value() << " in the global environment" << std::endl;
}
else {
std::cout << "\t'" << key << "' does not exist in the global environment" << std::endl;
}
if (maybe_env_a) {
std::cout << "\t'" << key << "' is " << maybe_env_a.value() << " in target environment" << std::endl;
}
else {
std::cout << "\t'" << key << "' does not exist in target environment" << std::endl;
}
}
int main(int, char**) {
std::cout << "=== environments ===" << std::endl;
sol::state lua;
// A global variable to see if we can "fallback" into it
lua["b"] = 2142;
// Create a new environment
sol::environment plain_env(lua, sol::create);
// Use it
lua.script("a = 24", plain_env);
std::cout << "-- target: plain_env" << std::endl;
test_environment("a", plain_env, lua);
test_environment("b", plain_env, lua);
std::cout << std::endl;
// Create an environment with a fallback
sol::environment env_with_fallback(lua, sol::create, lua.globals());
// Use it
lua.script("a = 56", env_with_fallback);
std::cout << "-- target: env_with_fallback (fallback is global table)" << std::endl;
test_environment("a", env_with_fallback, lua);
test_environment("b", env_with_fallback, lua);
std::cout << std::endl;
return 0;
}
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