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To work effectively, an associative container needs to use the same comparison function for every operation Yet, it is unreasonable to expect users to remember the comparison function every time, especially when there C++ has beento check updated, reorganized, andthe same help This popular tutorial introduction to standard is no way completely that each call uses rewritten to comparison function Therefore, it makes sense for the container to remember the comparison function programmers learn the language faster and use it in a more modern, effective wayJust as C++ has evolved since the last By storing the comparator into teaching it They now introduce the C++ standard library from the beginning, giving edition, so has the authors' approach the container object, we are assured that every operation that comparesmeans to write useful programs without first having to master every language detail Highlighting today's best readers the elements will do so consistently For the same reasons that the container needs to know the element type, it the best use know needs to of the Examples that take advantage of the library, and explain the features of C++, also show how to make the comparator type in order tobook's authoritative discussion of fundamental C++ concepts and techniques makes store the comparator In principle, the container could infer language As in its previous editions, the thisvaluableby assuming that the comparator is pointer to a function that returns This Rewritten type resource even for more experienced programmersProgram Faster and More Effectively with a bool and it a takes references for quickerobjects using thekey_type oflibrarycontainer Unfortunately, this inferred to two learning, of the C++ standard the Updated to teach the most current programming Classic Restructured type would be overly techniques Filled withone learning aids that emphasize important points, warn about common restrictive For new thing, we should allow the comparator to be a styles and program design function object as well as a practices, and provide general we wereComplete withrequire that the skills plain function Even if usage tips willing to exercises that reinforce pitfalls, suggest good programming comparator be aand comprehensive in its coverageThe sourcestill be toobook's extended After all, the function, the inferred type would code for the restrictive examples is available on learned Authoritative comparison address below function might return an int or any other type that can be used in a condition the Web at the Similarly, the parameter type need not exactly match the key_type Any parameter type that is convertible to the key_type should also be allowed So, to use our Sales_item comparison function, we must specify the comparator type when we define the multiset In our case, that type is a function that returns a bool and takes two const Sales_item references We'll start by defining a typedef that is a synonym for this type (Section 79, p 276):
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// type of the comparison function used to order the multiset typedef bool (*Comp)(const Sales_item&, const Sales_item&);
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This statement defines Comp as a synonym for the pointer to function type that matches the comparison function we wish to use to compare Sales_item objects Next we'll need to define a multiset that holds objects of type Sales_item and that uses this Comp type for its comparison function Each constructor for the associative containers allows us to supply the name of the comparison function We can define an empty multiset that uses our compare function as follows:
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std::multiset<Sales_item, Comp> items(compare);
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This definition says that items is a multiset that holds Sales_item objects and uses an object of type Comp to compare them The multiset is emptywe supplied no elementsbut we did supply a comparison function named compare When we add or look for elements in items our compare function will be used to order the multiset
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