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Improve comments and example code.

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ThePhD 2020-01-24 20:24:50 -05:00
parent ba9507107b
commit c5863c8c31
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1 changed files with 13 additions and 4 deletions
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17
examples/source/customization_base_object_catch.cpp
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@ -92,9 +92,16 @@ sol::object BaseObject::getAsRetyped(lua_State* L, BaseObjectLifetime Lifetime)
return sol::make_object(L, std::make_shared<Weapon>(*static_cast<const Weapon*>(this))); return sol::make_object(L, std::make_shared<Weapon>(*static_cast<const Weapon*>(this)));
} }
default: default:
// we have a normal type here, so that means we
// must bypass customization points
std::cout << "Unknown type: falling back to base object." << std::endl; std::cout << "Unknown type: falling back to base object." << std::endl;
// we have a normal type here, so that means we
// must bypass typical customization points by using
// sol::make_object_userdata/sol::make_reference_userdata
// WARNING: IF THIS TYPE IS IN FACT NOT A BASE OBJECT,
// BUT SOME DERIVED OBJECT, THEN RUNNING THIS CODE FOR
// VALUE TYPES AND SHARED TYPES WILL "SLICE"
// THE DERIVED BITS OFF THE BASE BITS PERMANENTLY
// NEVER FORGET TO UPDATE THE SWITCH IF YOU ADD
// NEW TYPES!!
switch (Lifetime) { switch (Lifetime) {
case BaseObjectLifetime::Value: case BaseObjectLifetime::Value:
return sol::make_object_userdata(L, *this); return sol::make_object_userdata(L, *this);
@ -123,8 +130,8 @@ int sol_lua_push(sol::types<std::shared_ptr<BaseObject>>, lua_State* L, const st
} }
int main() { int main() {
// test our customization points out // test our customization points out
std::cout << "=== Base object customization points ===" << std::endl; std::cout << "=== Base object customization points ===" << std::endl;
sol::state lua; sol::state lua;
lua.open_libraries(sol::lib::base, sol::lib::string, sol::lib::table); lua.open_libraries(sol::lib::base, sol::lib::string, sol::lib::table);
@ -157,6 +164,7 @@ int main() {
// Same objects but as base objects to test mapping. // Same objects but as base objects to test mapping.
std::cout << "Base-cast pointers..." << std::endl; std::cout << "Base-cast pointers..." << std::endl;
lua["ptrBaseAsBase"] = static_cast<BaseObject*>(&base);
lua["ptrArmorAsBase"] = static_cast<BaseObject*>(&armor); lua["ptrArmorAsBase"] = static_cast<BaseObject*>(&armor);
lua["ptrWeaponAsBase"] = static_cast<BaseObject*>(&weapon); lua["ptrWeaponAsBase"] = static_cast<BaseObject*>(&weapon);
std::cout << std::endl; std::cout << std::endl;
@ -168,6 +176,7 @@ int main() {
std::cout << std::endl; std::cout << std::endl;
std::cout << "Smart pointers put as the base class..." << std::endl; std::cout << "Smart pointers put as the base class..." << std::endl;
lua["sharedBaseAsBase"] = (std::shared_ptr<BaseObject>)std::make_shared<BaseObject>();
lua["sharedArmorAsBase"] = (std::shared_ptr<BaseObject>)std::make_shared<Armor>(); lua["sharedArmorAsBase"] = (std::shared_ptr<BaseObject>)std::make_shared<Armor>();
lua["sharedArmorAsBase"] = (std::shared_ptr<BaseObject>)std::make_shared<Weapon>(); lua["sharedArmorAsBase"] = (std::shared_ptr<BaseObject>)std::make_shared<Weapon>();
std::cout << std::endl; std::cout << std::endl;