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Copy constructors are often called implicitly to pass method arguments As an example, assume the following method: void f(auto_handle<T> t); The following code can be used to call f: auto_handle<T> t = gcnew T(); f(t); Before f is called, the parameter t is copied on the stack via the copy constructor Since auto_handle s copy constructor is implemented so that only one auto_handle refers to an object, an auto_handle variable will wrap a nullptr handle after it is passed into a function call to f You should define functions with auto_handle parameters only if you intend to pass the responsibility for cleaning up the wrapped object from the calling method to the called method It is also possible to define methods that return an auto_handle type To understand the use case for auto_handle return types, it makes sense to review the GetFile function in the sample code shown previously.

The topmost layer is the user code layer. This layer consists of your managed application written in C#. Your application may use your reusable class libraries shared with other projects.

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If you recall, the HomeController created a ModelAndView with a view name of home. How does that logical View name lead to an actual View instance (in this case a JSP page) An instance of org.springframework.web.servlet.ViewResolver steps in and provides the mappings between View names and the View instance. For our JSP files, the simple org.springframework.web.servlet.view. InternalResourceViewResolver will provide the perfect view resolution. In this context, Internal Resource refers to any resource accessible via the Servlet API s RequestDispatcher. We like using the InternalResourceViewResolver for two reasons. First, unlike other ViewResolver implementations, the InternalResourceViewResolver does not require explicit mappings between View names and View instances, which significantly reduces the amount of configuration required. This works when your logical View names from the ModelAndView match filename substrings of your JSP pages. The second reason why we like this particular ViewResolver is that it defaults to supporting JSP pages as Views, further reducing the configuration necessary.

FileStream^ GetFile() { return gcnew FileStream("sampletxt", FileMode::Open); } GetFile expects the caller to dispose the returned FileStream object However, there is nothing in the signature of this function that can be seen as a hint to this fact In order to find this out, you have to look into the documentation or, in the worst case, you have to reverseengineer the GetFile function with ILDASM or another tool If you don t make sure you know about the semantics of the functions you call, you will likely end up disposing expensive objects either twice or not at all Neither situation is desired The following code shows how the GetFile method can be modified so that its signature clearly states that the caller is supposed to do the cleanup: auto_handle<FileStream> GetFile() { FileStream^ fs = gcnew FileStream("sample.

The next layer is the .NET Micro base class library layer, which provides a subset of the common .NET libraries and domain-specific extensions, such as libraries for touching the hardware, simple drawing, complex graphical user interfaces, and networking. The .NET Micro Framework provides a subset of the full .NET Framework base class library (BCL). Microsoft tried to stay in line with the full .NET Framework class library wherever possible. If the functionality or interface of a class deviates from the full .NET Framework, that class or interface was moved to the new namespace Microsoft.SPOT.

To turn on an InternalResourceViewResolver, simply define it as a bean in the springservlet.xml file, as we have done in Listing 4-11. You must then configure this resolver with a prefix and suffix to be used when generating the full path to the view resource. For instance, all of the JSP files are in the /WEB-INF/jsp/ directory, and they all have the file extension .jsp. Therefore, with a view name of home, a prefix of /WEB-INF/jsp/, and a suffix equal to .jsp, the full path to the view resource becomes /WEB-INF/jsp/home.jsp. Listing 4-11. ViewResolver Addition to spring-servlet.xml <bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="prefix" value="/WEB-INF/jsp/" /> <property name="suffix" value=".jsp"/> </bean>

It is good practice to place all view pages, including JSP pages, inside or below the /WEB-INF direcTip

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