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A latch is implemented as a few bytes of memory The value of a latch s memory area indicates whether that latch is available or not In multiprocessor systems, it is very important that acquisition and release of latches be atomic, since any processor can modify the given memory area, but only one process must be allowed to modify it Most operating-system (OS) platforms provide atomic instructions such as test-and-set instructions or compare-and-swap (CAS) instructions, and latches are implemented using those instructions A test-and-set instruction checks a latch s memory area If the memory area indicates that the latch is available, then that memory area is marked, indicating the acquisition of that latch If the latch is not available, then one of several latch-acquisition algorithms kicks in So far, I ve described the mechanism very simplistically There are many more details to consider, such as latch recovery structures.

The concrete WebRequest-derived classes do not support public constructors that could be used to create a new instance The only way to instantiate an HttpWebRequest for a URL is to call WebRequest::Create passing an HTTP- or HTTPS-based URL In addition to the members of WebRequest, HttpWebRequest offers many members that are specific for the HTTP protocol (eg, to specify whether a GET or a POST request should be made) To access these members, the WebResponse handle returned by WebRequest::Create must be downcasted to an HttpWebRequest handle There are different options to achieve such a downcast As in the sample before, a dynamic_cast could be used The dynamic_cast returns nullptr either if the input was a nullptr or if the cast was not successful.

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Since it is clear from the context that a WebRequest::Create returns a handle to an HttpRequest instance when an HTTP-based URL is passed, one could silently omit the checking for the nullptr If the cast unexpectedly returns a nullptr because the assumption that was made is not true, the first attempt to access the object via the nullptr results in a NullReferenceException In such a situation, it is impossible to conclude from the exception whether the dynamic_cast returned a nullptr because its input was an unexpected nullptr or because its input was of an unexpected type The safe_cast allows a clear differentiation of these two cases The following code shows how a safe_cast can be used: WebRequest^ req = WebRequest::Create("http://wwwheege.

With a managed runtime, saving information is easy When I needed to write the materials that make it simpler to persist data into a relational database, I kept getting visions of complex frameworks that nobody understands or wants So while looking on the Internet, I visited the web site for Hibernate, which I heard of through my experience with Java I was skeptical of O/R mapping because, well, my encounters with object relational mapping and object databases were extremely discouraging And again, I was pleasantly surprised Hibernate is extremely popular in the Java world, and I came to understand why while using NHibernate So the moral and focus of this chapter is that you should never ever need to write a lowlevel routine to persist an object.

net"); HttpWebRequest^ httpReq = safe_cast<HttpWebRequest^>(req); // use HttpRequest specific members here httpReq->AllowAutoRedirect = true; When the casted variable refers to an object of the wrong type, a System::InvalidCastException^ is thrown When the input of the cast operator is unexpectedly a nullptr, the result of the cast is also a nullptr, and the attempt to use the casted value will cause a System::NullReferenceException Even the good old C-style cast can be used for downcasting For casts to tracking handle types, the C-style cast is either mapped to a safe_cast or to a safe_cast and a const_cast The safe_cast and the dynamic_cast are similar in that they both perform a runtime check against the input object Such a runtime check is helpful to ensure that wrong assumptions have a clear outcome, but they also imply a performance cost.

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