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Because you don t specify otherwise, the runtime assumes that the name of the F# function is the same as the name of the entry point in the DLL It s possible to override this behavior using the EntryPoint parameter in the DllImport attribute It s important to note the declarative approach of the PInvoke interface No code is involved in accessing external functions The runtime interprets metadata in order to automatically interoperate with native code contained in a DLL This is a different approach from the one adopted by different virtual machines, such as the Java virtual machine The Java Native Interface (JNI) requires that you define a layer of code using types of the virtual machine and invoke the native code.

Question 7. (advanced) How would you implement the GROUP BY, ORDER BY, and HAVING clauses Make the changes to the optimizer to enable these clauses.

PInvoke requires high privileges in order to execute native code, because the activation record of the native function is allocated on the same stack containing the activation records of managed functions and methods Moreover, as discussed shortly, it s also possible to have the native code invoking a delegate marshalled as a function pointer, allowing stacks with native and managed activation records to be interleaved..

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Listing 18-1. A Test Fixture for the isPalindrome Function #light open System open NUnit.Framework open IsPalindrome [<TestFixture>] type Test() = let posTests(strings) = for s in strings do Assert.IsTrue(isPalindrome s, sprintf "isPalindrome(\"%s\") must return true" s) let negTests(strings) = for s in strings do Assert.IsFalse(isPalindrome s, sprintf "isPalindrome(\"%s\") must return false" s) [<Test>] member x.EmptyString () = Assert.IsTrue(isPalindrome(""), "isPalindrome must return true on an empty string") [<Test>] member x.SingleChar () = posTests ["a"] [<Test>] member x.EvenPalindrome () = posTests [ "aa"; "abba"; "abaaba" ] [<Test>] member x.OddPalindrome () = posTests [ "aba"; "abbba"; "abababa" ] [<Test>] member x.WrongString () = negTests [ "as"; "F# is wonderful"; "Nice" ] Test units are simply methods that invoke objects of the program and test return values to check that its behavior conforms to the specification. As you can see, we also introduced the posTests and negTests functions used in several tests. Developing unit tests is simply a matter of defining types containing the tests. Although it is possible to write a single test for a program, it is a good idea to have many small tests checking various features and different inputs. In this case, we have been able to introduce five tests for a simple function; of course, we did it to show the main idea, but nevertheless we have developed a test for each significant input to the function. We could have developed a single test with all the code used for the single tests together, but as you will see shortly, this would have reduced the ability of the test suite to spot problems in the program. In general, the choice of the granularity of a test suite for a program is up to the

There are many ways to accomplish this. In keeping with the design of the Query_tree class, each of these operations can be represented as another node type. You can build a method to handle each of these, just as we did with restrict, project, and join. Note, however, that the HAVING clause is used with the GROUP BY clause and the ORDER BY clause is usually processed last.

The HelloWorld function is a simple case because the function doesn t have input arguments and doesn t return any value. Consider this function with input arguments and a return value: int CINTEROPDLL_API Sum(int i, int j) { return i + j; } Invoking the Sum function requires integer values to be marshalled to the native code and the value returned to managed code. Simple types such as integers are easy to marshal because they re usually passed by value and use types of the underlying architecture. The F# program using the Sum function is as follows: module CInterop = [<DllImport("CInteropDLL", CallingConvention=CallingConvention.Cdecl)>] extern int Sum(int i, int j) printf "Sum(1, 1) = %d\n" (CInterop.Sum(1, 1)); Parameter passing assumes the same semantics of the CLR, and parameters are passed by value for value types and by the value of the reference for reference types. Again, you use the custom attribute to specify the calling convention for the invocation.

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