89 lines
1.9 KiB
C++
89 lines
1.9 KiB
C++
#define SOL_ALL_SAFETIES_ON 1
|
|
#include <sol/sol.hpp>
|
|
|
|
#include <iostream>
|
|
#include <unordered_map>
|
|
|
|
// use as-is,
|
|
// add as a member of your class,
|
|
// or derive from it and bind it appropriately
|
|
struct dynamic_object {
|
|
std::unordered_map<std::string, sol::object> entries;
|
|
|
|
void dynamic_set(std::string key, sol::stack_object value) {
|
|
auto it = entries.find(key);
|
|
if (it == entries.cend()) {
|
|
entries.insert(
|
|
it, { std::move(key), std::move(value) });
|
|
}
|
|
else {
|
|
std::pair<const std::string, sol::object>& kvp
|
|
= *it;
|
|
sol::object& entry = kvp.second;
|
|
entry = sol::object(std::move(value));
|
|
}
|
|
}
|
|
|
|
sol::object dynamic_get(std::string key) {
|
|
auto it = entries.find(key);
|
|
if (it == entries.cend()) {
|
|
return sol::lua_nil;
|
|
}
|
|
return it->second;
|
|
}
|
|
};
|
|
|
|
|
|
int main() {
|
|
std::cout << "=== dynamic_object ===" << std::endl;
|
|
|
|
sol::state lua;
|
|
lua.open_libraries(sol::lib::base);
|
|
|
|
lua.new_usertype<dynamic_object>("dynamic_object",
|
|
sol::meta_function::index,
|
|
&dynamic_object::dynamic_get,
|
|
sol::meta_function::new_index,
|
|
&dynamic_object::dynamic_set,
|
|
sol::meta_function::length,
|
|
[](dynamic_object& d) { return d.entries.size(); });
|
|
|
|
lua.safe_script(R"(
|
|
d1 = dynamic_object.new()
|
|
d2 = dynamic_object.new()
|
|
|
|
print(#d1) -- length operator
|
|
print(#d2)
|
|
|
|
function d2:run(lim)
|
|
local r = 0
|
|
for i=0,lim do
|
|
r = r + i
|
|
end
|
|
if (r % 2) == 1 then
|
|
print("odd")
|
|
end
|
|
return r
|
|
end
|
|
|
|
-- only added an entry to d2
|
|
print(#d1)
|
|
print(#d2)
|
|
|
|
-- only works on d2
|
|
local value = d2:run(5)
|
|
assert(value == 15)
|
|
)");
|
|
|
|
// does not work on d1: 'run' wasn't added to d1, only d2
|
|
auto script_result = lua.safe_script(
|
|
"local value = d1:run(5)", sol::script_pass_on_error);
|
|
SOL_ASSERT(!script_result.valid());
|
|
sol::error err = script_result;
|
|
std::cout << "received expected error: " << err.what()
|
|
<< std::endl;
|
|
std::cout << std::endl;
|
|
|
|
return 0;
|
|
}
|