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The following example uses map to demonstrate the basic associative container techniques:
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// Demonstrate the basic associative container operations // // This example uses map, but the same basic techniques can be // applied to any associative container #include <iostream> #include <string> #include <map> using namespace std; void show(const char *msg, map<string, int> mp); int main() { // Declare an empty map that holds key/value pairs // in which the key is a string and the value is an int map<string, int> m; // Insert characters into m An iterator to the inserted // object is returned minsert(pair<string, int>("Alpha", 100)); minsert(pair<string, int>("Gamma", 300)); minsert(pair<string, int>("Beta", 200)); // Declare an iterator to a map<string, itr> map<string, int>::iterator itr; // Display the first element in m
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itr = mbegin(); cout << "Here is the first key/value pair in m: " << itr->first << ", " << itr->second << endl; // Display the last element in m itr = mend(); --itr; cout << "Here is the last key/value pair in m: " << itr->first << ", " << itr->second << "\n\n"; // Display the entire contents of m show("Entire contents of m: ", m); // Show the size of m, which is the number of elements // currently held by m cout << "Size of m is " << msize() << "\n\n"; // Declare a reverse iterator to a map<string, itr> map<string, int>::reverse_iterator ritr; // Now, show the contents of m in reverse order cout << "The contents of m in reverse:\n"; for(ritr=mrbegin(); ritr != mrend(); ++ritr) cout << " " << ritr->first << ", " << ritr->second << endl; cout << endl; // Find an element given its key itr = mfind("Beta"); if(itr != mend()) cout << itr->first << " has the value " << itr->second << "\n\n"; else cout << "Key not found\n\n"; // Create another map that is the same as the first map<string, int> m2(m); show("Contents of m2: ", m2); // Compare two maps if(m == m2) cout << "m and m2 are equivalent\n\n"; // Insert more elements into m and m2 cout << "Insert more elements into m and m2\n"; minsert(make_pair("Epsilon", 99)); m2insert(make_pair("Zeta", 88)); show("Contents of m are now: ", m); show("Contents of m2 are now: ", m2); // Determine the relationship between m and m2 This is a // lexicographical compare Therefore, the first non-matching // element in the container determines which // container is less than the other if(m < m2) cout << "m is less than m2\n\n";
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// Remove the Beta from m merase("Beta"); show("m after removing Beta: ", m); if(m > m2) cout << "Now, m is greater than m2\n\n"; // Exchange the contents of m and m2 cout << "Exchange m and m2\n"; mswap(m2); show("Contents of m: ", m); show("Contents of m2: ", m2); // Clear m mclear(); if(mempty()) cout << "m is now empty"; return 0; } // Display the contents of a map<string, int> by using // an iterator void show(const char *msg, map<string, int> mp) { map<string, int>::iterator itr; cout << msg << endl; for(itr=mpbegin(); itr != mpend(); ++itr) cout << " " << itr->first << ", " << itr->second << endl; cout << endl; }
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The output is shown here:
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Here is the first key/value pair in m: Alpha, 100 Here is the last key/value pair in m: Gamma, 300 Entire contents of m: Alpha, 100 Beta, 200 Gamma, 300 Size of m is 3 The contents of m in reverse: Gamma, 300 Beta, 200 Alpha, 100 Beta has the value 200 Contents of m2: Alpha, 100 Beta, 200 Gamma, 300
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m and m2 are equivalent Insert more elements into m and m2 Contents of m are now: Alpha, 100 Beta, 200 Epsilon, 99 Gamma, 300 Contents of m2 are now: Alpha, 100 Beta, 200 Gamma, 300 Zeta, 88 m is less than m2 m after removing Beta: Alpha, 100 Epsilon, 99 Gamma, 300 Now, m is greater than m2 Exchange m and m2 Contents of m: Alpha, 100 Beta, 200 Gamma, 300 Zeta, 88 Contents of m2: Alpha, 100 Epsilon, 99 Gamma, 300 m is now empty
Much of the program is self-explanatory, but there are a few aspects that warrant close examination First, notice how a map object is declared by the following line:
map<string, int> m;
This declares a map called m that holds key/value pairs in which the key is of type string and the value is of type int This means that the types of objects held by m are instances of pair<string, int> Notice that the default comparison function less is used This means that objects are stored in the map in ascending, sorted order Also notice that the default allocator is used Next, key/value pairs are inserted in m by calling insert( ), as shown here:
minsert(pair<string, int>("Alpha", 100)); minsert(pair<string, int>("Gamma", 300)); minsert(pair<string, int>("Beta", 200));
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