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C++: The Complete Reference
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return 0; }
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Notice the use of the pair template class to construct the key/value pairs The data types specified by pair must match those of the map into which the pairs are being inserted Once the map has been initialized with keys and values, you can search for a value given its key by using the find( ) function find( ) returns an iterator to the matching element or to the end of the map if the key is not found When a match is found, the value associated with the key is contained in the second member of pair In the preceding example, key/value pairs were constructed explicitly, using pair<char, int> While there is nothing wrong with this approach, it is often easier to use make_pair( ), which constructs a pair object based upon the types of the data used as parameters For example, assuming the previous program, this line of code will also insert key/value pairs into m
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minsert(make_pair((char)('A'+i), 65+i));
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Here, the cast to char is needed to override the automatic conversion to int when i is added to 'A' Otherwise, the type determination is automatic
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Storing Class Objects in a Map
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As with all of the containers, you can use a map to store objects of types that you create For example, the next program creates a simple phone directory That is, it creates a map of names with their numbers To do this, it creates two classes called name and number Since a map maintains a sorted list of keys, the program also defines the < operator for objects of type name In general, you must define the < operator for any classes that you will use as the key (Some compilers may require that additional comparison operators be defined)
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// Use a map to create a phone directory #include <iostream> #include <map> #include <cstring> using namespace std; class name { char str[40]; public: name() { strcpy(str, ""); }
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I n t r o d u c i n g t h e S t a n d a r d Te m p l a t e L i b r a r y
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name(char *s) { strcpy(str, s); } char *get() { return str; } }; // Must define less than relative to name objects bool operator<(name a, name b) { return strcmp(aget(), bget()) < 0; } class phoneNum { char str[80]; public: phoneNum() { strcmp(str, ""); } phoneNum(char *s) { strcpy(str, s); } char *get() { return str; } }; C++
int main() { map<name, phoneNum> directory; // put names and numbers into map directoryinsert(pair<name, phoneNum>(name("Tom"), phoneNum("555-4533"))); directoryinsert(pair<name, phoneNum>(name("Chris"), phoneNum("555-9678"))); directoryinsert(pair<name, phoneNum>(name("John"), phoneNum("555-8195"))); directoryinsert(pair<name, phoneNum>(name("Rachel"), phoneNum("555-0809"))); // given a name, find number char str[80]; cout << "Enter name: "; cin >> str; map<name, phoneNum>::iterator p; p = directoryfind(name(str));
C++: The Complete Reference
if(p != directoryend()) cout << "Phone number: " << p->secondget(); else cout << "Name not in directory\n"; return 0; }
Here is a sample run:
Enter name: Rachel Phone number: 555-0809
In the program, each entry in the map is a character array that holds a null- terminated string Later in this chapter, you will see an easier way to write this program that uses the standard string type
Algorithms
As explained, algorithms act on containers Although each container provides support for its own basic operations, the standard algorithms provide more extended or complex actions They also allow you to work with two different types of containers at the same time To have access to the STL algorithms, you must include <algorithm> in your program The STL defines a large number of algorithms, which are summarized in Table 24-5 All of the algorithms are template functions This means that they can be applied to any type of container All of the algorithms in the STL are covered in Part Four The following sections demonstrate a representative sample
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