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Example
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Here is an example that uses ptr_fun( ) It creates a vector of character pointers that point to character strings It then uses the standard library function strcmp( ) to find the pointer that points to "Three" Since strcmp( ) is not a function object, the adaptor ptr_fun( ) is used to allow the value "Three" to be bound to strcmp( )'s second parameter using bind2nd( ) Since strcmp( ) returns false on success, the negator not1( ) is applied to reverse this condition
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Herb Schildt's C++ Programming Cookbook
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Without the use of ptr_fun( ), it would not be possible to apply bind2nd( ) to strcmp( ) That is, since strcmp( ) is a function, it is not possible for it to be used with bind2nd( ) directly
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// Use a pointer-to-function adaptor #include #include #include #include #include <iostream> <vector> <algorithm> <functional> <cstring>
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using namespace std; template<class InIter> void show_range(const char *msg, InIter start, InIter end); int main() { vector<char *> v; vector<char *>::iterator itr; vpush_back("One"); vpush_back("Two"); vpush_back("Three"); vpush_back("Four"); vpush_back("Five"); show_range("Sequence contains: ", vbegin(), vend()); cout << endl; cout << "Searching sequence for Three\n\n"; // Use a pointer-to-function adaptor itr = find_if(vbegin(), vend(), not1(bind2nd(ptr_fun(strcmp), "Three"))); if(itr != vend()) { cout << "Found!\n"; show_range("Sequence from that point is: ", itr, vend()); } return 0; } // Show a range of elements template<class InIter> void show_range(const char *msg, InIter start, InIter end) { InIter itr; cout << msg; for(itr = start; itr != end; ++itr) cout << *itr << " "; cout << endl; }
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Algorithms, Function Objects, and Other STL Components
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The program's output is shown here
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Sequence contains: One Two Three Four Five Searching sequence for Three Found! Sequence from that point is: Three Four Five
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Options and Alternatives
Another approach to adapting a function is to create your own function object class Have its operator( ) call the function and return the result While far less elegant than using a pointer-to-function adaptor, this technique may be useful in situations in which the result of the function is processed a bit before use The ptr_fun( ) adaptor works only on non-member functions The STL defines adaptors for member functions, which are called mem_fun( ) and mem_fun_ref( ) These are collectively called the pointer-to-member function adaptors
Use the Stream Iterators
Key Ingredients
Headers <iterator> <iterator> <iterator> Classes istream_iterator ostream_iterator istreambuf_iterator Functions and Operators * ++ * ++ * ++ bool equal(istreambuf_iterator<CharType, Attr> &ob) * ++ bool failed const throw( )
<iterator>
ostreambuf_iterator
The STL defines four classes that enable you to obtain iterators to I/O streams These are commonly referred to as the stream iterators, and they are among some of the STL's most interesting objects because they allow an I/O stream to be operated on in much the same way as you operate on containers The benefits of the stream iterators are most apparent
Herb Schildt's C++ Programming Cookbook
when used with algorithms, where a stream can provide input to or receive output from some action Although most I/O operations will still use the standard I/O operators and functions, the ability to apply algorithms to streams offers a new way to think about I/O programming The stream iterators can also simplify certain difficult or tedious I/O situations Although an in-depth discussion of the stream iterators is quite lengthy and is beyond the scope of this book, this recipe describes the basic approach needed to use them
Step-by-Step
To use the stream iterators to input data involves these steps: 1 To create an iterator to a formatted input stream, construct an object of type istream_iterator, specifying the input stream 2 To create an iterator to a character-based input stream, construct an object of type istreambuf_iterator, specifying the input stream 3 To input data from the stream, dereference the iterator Then, increment the iterator This causes it to read the next item from the stream Repeat this process until all data is read or the end of the stream is reached 4 An iterator that indicates end-of-stream is constructed by the default constructor To use the stream iterators to output data involves these steps: 1 To create an iterator to a formatted output stream, construct an object of type ostream_iterator, specifying the output stream 2 To create an iterator to a character-based output stream, construct an object of type ostreambuf_iterator, specifying the output stream 3 To output data to the stream, assign the value through the dereferenced iterator There is no need to increment the iterator Each assignment automatically advances the output 4 If an output error occurs, the failed( ) function will return true
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