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inserter() takes two arguments: the container itself and an iterator into the container indicating the position at which insertion should begin For example:
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unique_copy( ivecbegin(), ivecend(), inserter( vres, vresbegin() );
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The iterator marking the position to begin insertion does not remain fixed but instead is incremented with each element that is inserted so that each element is inserted in turn It is as if we had written
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vector< int >::iterator iter = vresbegin(), iter2 = ivecbegin(); for ( ; iter2 != ivecend(); ++iter, ++iter2 ) vresinsert( iter, *iter2 );
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Reverse Iterators The begin() and end() operations return, respectively, an iterator to the first element of the container and an iterator to 1 past the last element of the container It is also possible to return a reverse iterator: one that traverses the container from the last element to the first The operations supporting that capability for all the container types are rbegin() and rend() As with forward iterators, there are both a const and a non-const instance
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vector< int > vec0; const vector< int > vec1; vector< int >::reverse_iterator r_iter0 = vec0rbegin(); vector< int >::const_reverse_iterator r_iter1 = vec1rbegin();
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A reverse iterator is traversed in the same manner as a forward iterator The difference is in the implementation of the next (and previous) operators For a forward iterator, ++ accesses the next element in the container; for a reverse iterator, it accesses the previous element For example, to traverse a vector backward, one would write
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// reverse iterator of vector from back to front vector< type >::reverse_iterator r_iter; for ( r_iter = vec0rbegin(); // binds r_iter to last element r_iter != vec0rend(); // not equal 1 past 1st element r_iter++ ) // decrements! iterator one element { /* */ }
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Although it may seem confusing to have the meaning of the increment and decrement operators reversed, it lets the programmer transparently pass a pair of reverse iterators to an algorithm For example, to sort our vector in descending order, we simply pass sort() a pair of reverse iterators, as follows:
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// sorts vector in ascending order sort( vec0begin(), vec0end() );
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// sorts vector in descending order sort( vec0rbegin(), vec0rend() );
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iostream Iterators The standard library provides support for both input and output iostream iterators to work in conjunction with the standard library container types and generic algorithms The istream_iterator class supports iterator operations on an istream or one of its derived classes, such as an ifstream input file stream Similarly, the ostream_iterator supports iterator operations on an ostream or one of its derived classes, such as an ofstream output file stream To use either iterator, the iterator header file must be included:
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#include <iterator>
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For example, in the following program, we use an istream iterator to read a collection of integers from standard input into a vector and then use an ostream iterator as the target of the unique_copy() generic algorithm
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#include <iostream> #include <iterator> #include <algorithm> #include <vector> #include <functional> /* * input: * 23 109 45 89 6 34 12 90 34 23 56 23 8 89 23 * * output: * 109 90 89 56 45 34 23 12 8 6 */ int main() { istream_iterator< int > input( cin ); istream_iterator< int > end_of_stream; vector<int> vec; copy ( input, end_of_stream, inserter( vec, vecbegin() )); sort( vecbegin(), vecend(), greater<int>() ); ostream_iterator< int > output( cout, " " ); unique_copy( vecbegin(), vecend(), output ); }
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istream_iterator An istream_iterator is declared using the following general form:1">[1]
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[1] If your compiler does not yet support default values for template parameters, then you will need to provide an explicit second argument to the istream_iterator constructor: the difference_type of the container into which the elements are to be placed The difference_type is the type capable of holding the result of subtracting two iterators of a container For example, in Section 122, in the presentation of the program run under a compiler not yet supporting default values for template parameters, we wrote
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