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// of class template specialization LongDouble Queue<LongDouble>::min( ) { }
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A class template cannot be instantiated from the generic template definition in some files and be specialized in other files for the same set of template arguments For example, given the specialization of the template QueueItem<LongDouble>, the specialization must be declared in every file where it is used:
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// ---- File1C ---#include "Queueh" void ReadIn( Queue<LongDouble> *pq ) { // uses of pq->add() // cause the instantiation of QueueItem<LongDouble> } // ---- File2C ---#include "QueueLDh" void ReadIn( Queue<LongDouble> * ); int main() { // uses specialization definition for QueueItem<LongDouble> Queue<LongDouble> *qld = new Queue<LongDouble>; ReadIn( qld ); // }
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The previous program is in error, although implementations most often do not diagnose such erroneous programs To avoid such errors, the header QueueLDh should be included in every file where Queue<LongDouble> is used and before it is first used in each file
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If a class template has more than one template parameter, one might want to specialize the class template for a particular template argument or a set of template arguments without specializing the template for every template parameter That is, one might want to provide a template that matches a generic template except that some of the template parameters have been replaced by actual types or values This is possible using a class template partial specialization A class template partial specialization might be needed to define a more appropriate or efficient implementation than the generic template definition for a particular set of template arguments For example, let's use the class template Screen introduced in Section 162 The partial specialization Screen<hi,80> provides a more efficient implementation for screens with 80 columns:
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template <int hi, int wid> class Screen { // }; // partial specialization of class template Screen template <int hi> class Screen<hi, 80> { public: Screen(); // private:
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string _screen; string::size_type _cursor; short _height; // Uses special algorithms for screens with 80 columns };
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A class template partial specialization is a template, and the definition of a partial specialization looks like a template definition Such a definition begins with the keyword template followed by a template parameter list enclosed by the less than and greater than tokens The parameter list of a class template partial specialization differs from the parameter list of the corresponding generic class template definition The partial specialization for Screen only has one nontype template parameter named hi, because the template argument for wid is known to be 80 The template parameter list for the partial specialization only lists the parameters for which the template arguments are still unknown The partial specialization has the same name as the generic template to which it corresponds; namely, Screen However, the name of a class template partial specialization is always followed by a template argument list In the previous example, the template argument list is <hi,80> Because the argument value for the first template parameter is unknown, the argument list uses the name of the template parameter hi as a place holder; the other argument is a value, the value 80 for which the template is partially specialized A class template partial specialization is instantiated implicitly when used in a program In the following example, the class template partial specialization is instantiated with a template argument for hi that is 24
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Screen<24,80> hp2621;
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Notice that the instantiation for Screen<24,80> could be instantiated from the generic class template definition as well as from the partial specialization Why is it then that the partial specialization is chosen to instantiate the template When class template partial specializations are declared, the compiler chooses the template definition that is the most specialized for the instantiation When no partial specialization can be used, the generic template definition is used For example, when Screen<40,132> must be instantiated, this instantiation does not match the partial specialization provided The partial specialization is only used to instantiate Screen types with 80 columns The definition of a partial specialization is completely disjointed from the definition of the generic template The partial specialization may have a completely different set of members from the generic class template A class template partial specialization must have its own definitions for its member functions, static data members, and nested types The generic definitions for the members of a class template are never used to instantiate the members of the class template partial specialization For example, the constructor for the partial specialization Screen<hi,80> must be defined Here is a possible definition:
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// constructor for partial specialization Screen<hi,80> template<int hi> Screen<hi,80>::Screen() : _height( hi ), _cursor ( 0 ), _screen( hi * 80, bk ) { }
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If the template definition for the constructor of Screen<hi,80> is not provided and the partial specialization is used to instantiate a class type, the generic class template's constructor definition is not used to instantiate the member function
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