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The Standard Template Library and the string Class
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// use reciprocal function object p = transform(valsbegin(), valsend(), valsbegin(), reciprocal()); // call function object cout << "Transformed contents of vals:\n"; p = valsbegin(); while(p != valsend()) { cout << *p << " "; p++; } return 0; }
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Notice two important aspects of reciprocal() First, it inherits the base class unary_function This gives it access to the argument_type and result_type types Second, it defines operator( ) such that it returns the reciprocal of its argument In general, to create a function object, simply inherit the proper base class and overload operator( ) as required It really is that easy
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When using a binary function object, it is possible to bind a value to one of the arguments This can be useful in many situations For example, you may wish to remove all elements from a sequence that are greater than some value, such as 8 To do this, you need some way to bind 8 to the right-hand operand of the function object greater( ) That is, you want greater( ) to perform the following comparison val > 8 for each element of the sequence The STL provides a mechanism, called binders, that accomplishes this There are two binders: bind1st( ) and bind2nd( ) They take these general forms bind1st(binfunc_obj, value) bind2nd(binfunc_obj, value) Here, binfunc_obj is a binary function object bind1st( ) returns a unary function object that has binfunc_obj's left-hand operand bound to value bind2nd( ) returns a unary function object that has binfunc_obj s right-hand operand bound to value The bind2nd( ) binder
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is by far the most commonly used In either case, the outcome of a binder is a unary function object that is bound to the value specified To demonstrate the use of a binder, we will use the remove_if( ) algorithm It removes elements from a sequence according to the outcome of a predicate It has this prototype template <class ForIter, class UnPred> ForIter remove_if(ForIter start, ForIter end, UnPred func); The algorithm removes elements from the sequence defined by start and end if the unary predicate defined by func is true The algorithm returns a pointer to the new end of the sequence, which reflects the deletion of the elements The following program removes all values from a sequence that are greater than the value 8 Since the predicate required by remove_if is unary, we cannot simply use the greater( ) function object as-is, because greater( ) is a binary object Instead, we must bind the value 8 to the second argument of greater( ) using the bind2nd( ) binder, as shown in the program
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// Demonstrate bind2nd() #include <iostream> #include <list> #include <functional> #include <algorithm> using namespace std;
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int main() { list<int> lst; list<int>::iterator p, endp; int i; for(i=1; i < 20; i++) lstpush_back(i); cout << "Original sequence:\n"; p = lstbegin(); while(p != lstend()) { cout << *p << " "; p++; } cout << endl; endp = remove_if(lstbegin(), lstend(), bind2nd(greater<int>(), 8));
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The Standard Template Library and the string Class
cout << "Resulting sequence:\n"; p = lstbegin(); while(p != endp) { cout << *p << " "; p++; } return 0; }
The output produced by the program is shown here
Original sequence: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 Resulting sequence: 1 2 3 4 5 6 7 8
You might want to experiment with this program, trying different function objects and binding different values As you will discover, binders expand the power of the STL in very significant ways One last point: there is an object related to a binder, called a negator The negators are not1( ) and not2( ) They return the negation (ie, the complement of) whatever predicate they modify They have these general forms not1(unary_predicate) not2(binary_predicate) For example, if you substitute the line
endp = remove_if(lstbegin(), lstend(), not1(bind2nd(greater<int>(), 8)));
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