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void process_vocab( vector< textwords >*pvec ) { // stable_sort( textsbegin(), textsend(), LessThan() ); // }
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Within stable_sort(), the overloaded call operator is expanded inline (stable_sort() is able to accept a third argument that is either a pointer to the function less_than() or an object of the class LessThan, because the argument is a type parameter of template mechanism We look at function objects in more detail in Section 123) Here is the result of our stable_sort() of texts:
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a i as at by he in is it no of on so to and but for has her him its not now one red row she sky the you asks bird blue coat dark each emma fear grow hair held home life like long mean more puts same says star such tell that time what when wind with your alice alive blows daddy falls fiery lands leave looks quite rises shush shyly sight still stone tells there thing trees watch almost either flight houses night, ancient becomes bounded calling distant flowing heaven, magical passion through unravel untamed wanting darkened eternity beautiful darkening immensity journeying alternately immeasurable inexpressibly
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Our next task is to count the number of words whose length is greater than six characters We can accomplish this through the count_if() generic algorithm and a second function object, GreaterThan It is a somewhat more complicated function object because we have generalized it to allow the user to provide an explicit size against which to test We store the size in a class data member and initialize it with a class constructor By default, it is initialized with a size of 6:
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#include <iostream> class GreaterThan { public: GreaterThan( int sz = 6 ) : _size( sz ){} int size() { return _size; } bool operator()( const string & s1 ) { return s1size() > _size; } private: int _size; };
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Here is how we might use it:
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file:///F|/WinDDK/resources/CPPPrimer/c++primerhtm (526 / 1065) [2001-3-29 11:32:09]
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void process_vocab( vector< textwords >*pvec ) { // // count number of strings greater than length 6 int cnt = count_if( textsbegin(), textsend(), GreaterThan() ); cout "Number of words greater than length six are " cnt endl; // }
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Here is the output of this portion of our program:
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Number of words greater than length six are 22
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remove() behaves the same as unique() in that it does not actually alter the size of the container but rather separates the elements into those to be retained (copying them in turn to the front of the container) and those to be removed (which remain at the back) It returns an iterator marking the first element of those to be removed Here is how we might use it to erase a collection of common words we do not wish to retain within the vector:
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void process_vocab( vector< textwords >*pvec ) { // static string rw[] = { "and", "if", "or", "but", "the" }; vector< string > remove_words( rw, rw+5 ); vector<string>::iterator it2 = remove_wordsbegin(); for ( ; it2 != remove_wordsend(); ++it2 ) { // just to show another form of count() int cnt = count( textsbegin(), textsend(), *it2 ); cout cnt " instances removed: " (*it2) endl; textserase( remove(textsbegin(),textsend(),*it2 ), textsend() ); } // }
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Here is the result of remove() on texts:
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1 0 0 1 1
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instances instances instances instances instances
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removed: removed: removed: removed: removed:
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and if or but the
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file:///F|/WinDDK/resources/CPPPrimer/c++primerhtm (527 / 1065) [2001-3-29 11:32:09]
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Finally, we'd like to display the contents of the vector One way to accomplish this is to iterate over the elements, displaying each one in turn, but because that makes no use of the generic algorithms, in this context that solution is inappropriate Rather, we prefer to illustrate the use of the for_each() algorithm to output the elements of the vector for_each() applies a pointer to function or function object to each element of a container marked by an iterator pair In our case, our function object, PrintElem, prints the element to standard output:
class PrintElem { public: PrintElem( int lineLen = 8 ) : _line_length( lineLen ), _cnt( 0 ) {} void operator()( const string &elem ) { ++_cnt; if ( _cnt % _line_length == 0 ) { cout '\n'; } cout elem " "; } private: int _line_length; int _cnt; }; void process_vocab( vector< textwords >*pvec ) { // for_each( textsbegin(), textsend(), PrintElem() ); }
That's it We've completed our program, barely having done more than cobble together a sequence of generic algorithm invocations For convenience, we've listed the complete program next, together with a main() function to drive it (it looks ahead to special iterator types, discussed in Section 124) We've listed the actual code executed, which is not fully Standard C++ In particular, the available implementations of the count() and count_if() algorithms represent older versions that do not return the result but rather require an additional argument to be passed within which the value is placed In addition, the iostream library reflects a prestandard implementation requiring the use of an iostreamh header file
#include <vector> #include <string> #include <algorithm> #include <iterator> // prestandard syntax for <iostream> #include <iostreamh> class GreaterThan { public: GreaterThan( int sz = 6 ) : _size( sz ){} int size() { return _size; } bool operator()( const string &s1 ) { return s1size() > _size; } private:
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