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Delegates can be viewed as the function pointers of the managed world. As a C++ programmer, you probably often use typedef to hide some of the complexity of the syntax for declaring and using function pointers. A delegate is an object that designates a function to call on a specific object (if the function is an instance method) or class (if the function is a static method), or a global function. The delegate is not the function itself; it simply represents the address of a function to call, along with a specific object whose method is to be called, if applicable. Delegates are strongly typed, in that the parameter types and return type are part of the type of a delegate. A delegate variable may only be assigned to a function that matches the delegate signature. Delegates may not be used to designate a family of overloaded functions. They may only be used to designate specific function prototypes with specific arguments. You saw in 2 how to declare and use a simple delegate. Delegates are actually instances of the .NET Framework class System::MulticastDelegate. The name multicast implies that many functions may be called when a delegate is invoked. This is, in fact, the case. The delegate keeps an internal list of functions in an invocation list, and all the functions on that list are invoked every time the Invoke method is called. You use the += operator to add functions to the invocation list, and the -= operator to remove them. You can also use the () operator to call the Invoke method implicitly, as in Listing 7-11. Listing 7-11. Using a Delegate // delegate_operators.cpp using namespace System; delegate void MyDelegate(); ref class R { public:

The algorithms for working out the cost of a hash join are highly dependent on whether you enable CPU costing and/or the automatic workarea policy. This means that an upgrade from 8i to 9i, or any change in the features enabled, may cause dramatic changes in costs, which can result in dramatic changes in execution plans. Whatever set of features you have enabled for costing, there are catastrophe points in the calculations, i.e., points where a change in the hash_area_size (or pga_aggregate_target) that should apparently produce a decrease in cost may cause an increase in cost the point at which this occurs is dependent on which features are enabled. Effectively, this means you cannot safely fine-tune hash joins by tweaking either of these parameters and expect the end result to be stable you can always be unlucky. The most nicely behaved option at present seems to be manual hash_area_sizes with CPU costing enabled. This fails to produce an appropriate cost for multipass joins, but does produce good costs for onepass and optimal joins. Despite the apparent niceness of the manual hash_area_size with CPU costing, the strategic option is to set the workarea_size_policy to auto, and use the pga_aggregate_target with CPU costing. For problem queries, you may want to override the memory allocation at the session level, and fix some access paths by very deliberate use of hints at the statement level. Bear in mind that workarea_size_policy budgets for multitable joins much more wisely than the manual policy. This, in itself, is a very good reason for switching to the new technology.

1. 2.

Simple example of in-memory (optimal) hash join Onepass hash join Multipass hash join An anomaly in costing a onepass join using traditional methods An anomaly in costing a onepass join using the latest features Driver for generating traces with manual hash_area_size, without CPU costing

Navigate to your Calendar icon and click it. The default view is the Day view, which lists all appointments for the current calendar day. Move the Trackpad left or right to a previous day or an upcoming day. Notice that the date changes in the upper left-hand corner.

void f() { Console::WriteLine("R::f"); } void g() { Console::WriteLine("R::g"); } }; int main() { MyDelegate^ d; R^ r = gcnew R(); d += gcnew MyDelegate(r, &R::f); d += gcnew MyDelegate(r, &R::g); d->Invoke(); d -= gcnew MyDelegate(r, &R::g); // Use operator() instead of calling Invoke. d(); } The output of Listing 7-11 is as follows: R::f R::g R::f Don t worry that when you use the -= operator, you are passing a newly created delegate to the -= operator. This seems counterintuitive, since you re actually deleting something, not creating it anew. The -= operator compares the invocation list of the right-side delegate to the invocation list of the delegate from which you are removing it, and removes the matching function (or functions) from the list. Let s say the functions we re invoking have return values. delegate String^ MyDelegate(); You ll find that the line d += gcnew MyDelegate(r, &R::f); triggers a compiler warning: warning C4358: '+=': return type of combined delegates is not 'void'; returned value is undefined The issue is that if there are multiple functions called, each of which returns a different value, how do we know which function s return value gets returned from the delegate And what happens to the return values for the others In the CLR, the actual return value is the

has_cpu_harness.sql pat_nocpu_harness.sql pat_cpu_harness.sql has_dump.sql pat_dump.sql hash_stream_a.sql hash_stream_b.sql hash_stream_c.sql hash_stream_d.sql treble_hash.sql treble_hash_auto.sql treble_hash_manual.sql snap_myst.sql c_mystats.sql setenv.sql

Follow these steps to change the day you re viewing in the Calendar app with the Menu key: 1. 2. 3.