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Cycle Through a Container with for_each( )
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Headers <algorithm> Classes Functions template<class InIter, class Func> Func for_each(InIter start, InIter end, Func fn)
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As most programmers know, cycling through the contents of a container is a very common activity For example, to display the contents of a container, you will need to cycle through it from start to finish, displaying each element in turn Cycling through a container can be performed in a variety of ways For example, you can cycle through any type of container through the use of an iterator Containers such as vector and deque allow you to cycle through their contents via the array subscripting operator The for_each( ) algorithm offers another approach It cycles through a range of elements, applying a specific operation to each element This recipe demonstrates its use
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To cycle through a range of elements by use of for_each( ) involves these steps: 1 Create a function (or function object) that will be called for each element in the range 2 Call for_each( ), passing in iterators to the beginning and end of the range to be processed and the function to be applied
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The prototype for the for_each( ) algorithm is shown here: template<class InIter, class Func> Func for_each(InIter start, InIter end, Func fn) The for_each( ) algorithm applies the function fn to the range of elements specified by start and end Thus, fn is called once for each element in the range for_each( ) returns fn You can pass either a function pointer or a function object to fn In both cases, the fn must take one argument whose type is compatible with the type of the elements in the specified range It can return a value However, if fn does return a value, the value is ignored by for_each( ) Therefore, often, the return type of fn is void However, a return value might be useful in situations other than in a call to the for_each( ) algorithm For example, fn could keep a count of the number of elements that it processes and return this count after the for_each( ) algorithm returns
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Algorithms, Function Objects, and Other STL Components
Example
The following example shows for_each( ) in action It uses for_each() for two purposes First, a call to for_each( ) displays the contents of a container, one element at a time It uses the show( ) function to display each element Second, it computes the summation of the elements in the container In this case, for_each( ) is passed a pointer to the summation( ) function Notice that this function returns the summation This value is not used by for_each( ) Rather, it is obtained afterwards to obtain the sum of the elements
// Demonstrate the for_each() algorithm #include <iostream> #include <vector> #include <algorithm> using namespace std; // Display an int value void show(int i) { cout << i << " "; } // Keep a running sum of the values passed to i int summation(int i) { static int sum = 0; sum += i; return sum; } int main() { vector<int> v; int i; for(i=1; i < 11; i++) vpush_back(i); cout << "Contents of v: "; for_each(vbegin(), vend(), show); cout << "\n"; for_each(vbegin(), vend(), summation); cout << "Summation of v: " << summation(0); return 0; }
The output is shown here:
Contents of v: 1 2 3 4 5 6 7 8 9 10 Summation of v: 55
As explained in the discussion, the function passed to for_each( ) must have one parameter, and the type of this parameter must be the same as the type of the elements in the container on which the for_each( ) is used In this example, because v is a vector of int,
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