void test_scope_guard()
{
{
int *pi = new int;
ZL::ScopeGuard onExit([&] { delete pi; pi = nullptr; });
}
{
SC *sc = new SC;
ZL::ON_SCOPE_EXIT([&sc]{ delete sc; sc = nullptr; }); // Ok
//ON_SCOPE_EXIT([&sc]{ Safe_Delete(sc) }); // Ok
}
std::cout << "===================\n";
{
SC *sc = new SC;
//ON_SCOPE_EXIT([&sc]{ Safe_Delete(sc) });
ZL::ScopeGuard rollbackIfFail([&]{ sc->RollBack(); });
do
{
//do something.....
if (sc->Fail())
{
break;
}
rollbackIfFail.dismiss(); //上面if失败，走不到这里，因此会导致ScopeGuard执行sc的RollBack函数
} while (0);
}
std::cout << "===================\n";
{
SC *sc = new SC(1);
ZL::ON_SCOPE_EXIT([&sc]{ Safe_Delete(sc) });
ZL::ScopeGuard rollbackIfFail([&]{ sc->RollBack(); });
do
{
//do something.....
if (!sc->Success())
{
break;
}
rollbackIfFail.dismiss(); //执行到这里，设置取消rollback机制，执行成功
} while (0);
}
