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To hang up on everyone and end the conference call for all, press the Red Phone key or press the Menu key and select Drop Call.

void Print() { name = "Bob Jones"; // Error! Console::WriteLine(name); // OK } }; int main() { R^ r = gcnew R("Mary", "Colburn"); r->Print(); } The compilation output is for Listing 6-8 is as follows: Microsoft (R) C/C++ Optimizing Compiler Version 14.00.50727.42 for Microsoft (R) .NET Framework version 2.00.50727.42 Copyright (C) Microsoft Corporation. All rights reserved. initonly.cpp initonly.cpp(17) : error C3893: 'R::name' : l-value use of initonly data member is only allowed in an instance constructor of class 'R' An initializer is allowed if the initonly field is static, as demonstrated in Listing 6-9. Listing 6-9. Initializing a Static initonly Field // initonly_static_cpp using namespace System; ref class R { public: static initonly String^ name = "Ralph"; // OK // initonly String^ name = "Bob"; // Error! // rest of class declaration }; The initonly modifier can appear before or after the static modifier.

It is very instructive to compare trace files across versions sometimes you see very clearly how confusing it can be to guess what s going on. Notice how the 9i trace file has reported the same figures (allowing for a small rounding error) as the 8i trace in the calculation, but manages to come up with 25 as its final answer. Clearly 9i is tracking its intermediate results with high precision, but reporting them to the nearest integer (see the outer(1) in the 9i line in the preceding example). This move to high-precision calculations is controlled by the hidden parameter _optimizer_new_join_card_computation, which has the description compute join cardinality using non-rounded input values and defaults to true in 9i. Conveniently, the 10g trace file catches up with this feature and reports the intermediate results to two decimal places. Finally, 8i rounds and truncates as it goes which means that in this specific case, it s actually going to come up with the right answer for the wrong reason.

You can dial letters like 1-800-CALLABC when you are on a phone call or even put phone numbers with letters in your address book. To do this dialing while on the phone, just press the Alt key (lower left-most key) and type the letters on your keyboard.

every worker earned more than the average wage). Since we have 20,000 rows in our emp table, the optimizer s estimate of 1,000 rows in 8i and 9i is out by a factor of 10, and the estimate in 10g is out by a factor of 60. That s a problem with generic code, of course; the optimizer only sees a subquery, it doesn t understand the particularly special effect of the average function that happens to be embedded in that subquery.

So when you hear In order to use this phone directory, please dial the first three letters of the person s last name to look them up, just press the Alt key and type the letters!

In classic C++, a method can be declared const, which enforces that the method does not affect the value of any data in the object, for example: class N { void f() const { /* code which does not modify the object data */} }; This is an important element of const correctness, a design idiom in which operations that work on constant objects are consistently marked const, ensuring that programming errors in which a modification is attempted on a const object can be detected at compile time Const correctness is an important part of developing robust C++ code, in which errors are detected at compile time, not at runtime Proper const parameter types and return values go a long way to prevent common programming errors, even without true const correctness in the classic C++ sense.

So we find from our experiments with filtering that 8i hasn t got a clue about costs, 9i uses a circular argument for costing, and 10g knows what s going on in terms of cost but does something about the cardinality that is most inappropriate for the specific example. We will return to subqueries later in this chapter. The critical point I wanted to make with this particular example was that the area of query transformation shows a great deal of evolutionary change as you work through different versions of the optimizer.