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Prior to the assignment, the object referred to by p1 is deleted After the assignment, p1 has ownership of the object of type int containing the value 2,048 p2 can no longer be used to refer to this object In the third form of auto_ptr definition, we create an auto_ptr object but do not initialize it with a pointer to an object on the free store For example: // does not currently refer to an object auto_ptr< int > p_auto_int; asp.net ean 13 EAN - 13 ASP . NET Control - EAN - 13 barcode generator with free ...
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Free download for .NET EAN 13 Barcode Generator trial package to create & generate EAN 13 barcodes in ASP . NET , WinForms applications using C# & VB. Because p_auto_int is not initialized to refer to an object, its internal pointer value is set to 0 This means that dereferencing it would result in the program having undefined behavior, as would happen if we directly dereferenced a pointer of value 0: // oops: dereference of an auto_ptr pointing to no object if ( *p_auto_int != 1024 ) *p_auto_int = 1024; 1W 36.54 76.25 104.43 113.21 With an ordinary pointer, one simply tests the pointer against 0 For example: file:///F|/WinDDK/resources/CPPPrimer/c++primerhtm (387 / 1065) [2001-3-29 11:32:07] int *pi = 0; if ( pi != 0 ) ; But how does one test an auto_ptr object to determine whether it refers to an underlying object The get() operation returns the underlying pointer contained within the auto_ptr object So, to determine whether the auto_ptr object refers to an object, we can program the following: 2W 73 152.32 208.85 226.56 asp.net ean 13 Reading barcode EAN 13 in asp . net , C# - CodeProject
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19 Apr 2005 ... NET 2005 - 7.40 Kb ... The EAN - 13 barcode is composed of 13 digits, which are made up of the following sections: the first 2 or 3 digits are the ... // revised test to guarantee p_auto_int refers to an object if ( p_auto_intget() != 0 && *p_auto_int != 1024 ) *p_auto_int = 1024; (14:27) If it refers to no object, how can we make it refer to one that is, how can we set the underlying pointer of an auto_ptr object We can do so through the application of the reset() operation For example: else // ok, let's set p_auto_int's underlying pointer p_auto_intreset( new int( 1024 ) ); An auto_ptr object does not support the notion of being directly assigned the address of an object created by a new expression after it has been defined One cannot write 3W 109.47 228.33 313.16 339.7 void example() { // by default, initialized with a value of 0 auto_ptr< int > pi; { // not supported pi = new int( 5 ); } } asp.net ean 13 .NET EAN 13 Generator for C#, ASP . NET , VB.NET | Generating ...
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NET Core Barcode is a cross-platform Portable Class Library that generates barcodes using barcode fonts. It supports Windows, macOS and Linux, and can be ... To reset an auto_ptr object, we must use the reset() function reset() can be passed a pointer, or can be passed 0 if we wish to unset the auto_ptr object If the auto_ptr currently refers to an object and the auto_ptr object has ownership of the object, then the object to which the current auto_ptr refers is deleted prior to resetting the underlying pointer For example: auto_ptr< string > pstr_auto( new string( "Brontosaurus" ) ); // deletes Brontosaurus object prior to resetting pstr_autoreset( new string( "Long-neck" ) ); file:///F|/WinDDK/resources/CPPPrimer/c++primerhtm (388 / 1065) [2001-3-29 11:32:07] 4W 146 304.5 417.7 453.12 In this case, it is more efficient to reassign the existing string object using the string assign() operation rather than delete the existing string object and reallocate a second one: // more efficient form of resetting in this case // use string's assign() to set new value pstr_auto->assign( "Long-neck" ); j 0, 1, 2, 3: One of the hard things about programming is that simply getting correct results is sometimes not enough At times, we need not only to get the correct results but also to get them within a window of acceptable performance A small thing such as deallocating and reallocating a string object when a call to assign() is sufficient is an example of the kind of minute detail that, under some cases, accumulates into a measurable performance bottleneck These aren't details one should be fretting over while trying to provide an overall program solution, but eventually these kinds of details become part of the internal program checklist of experienced programmers The auto_ptr class template provides a great deal of safety and convenience for the handling of dynamically allocated memory We still need to be careful, however, or else we can still get ourselves into trouble What can we do wrong 1 We must be careful not to initialize or assign the auto_ptr with a pointer that was not allocated through application of a new expression If we do, the delete expression will be applied to a pointer not dynamically allocated, and this will result in undefined program behavior 2 We must be careful not to have two auto_ptr objects hold ownership to the same object in the free store One obvious way to make this mistake is to initialize or assign the same pointer to two objects A more subtle way of mistakenly accomplishing this is through the use of the get() operation For example: asp.net ean 13 EAN - 13 Barcode Generator for ASP . NET Web Application
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