STL Sample for the Generate FunctionLast reviewed: October 9, 1997Article ID: Q156079 |
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SUMMARYThe sample code below illustrates how to use the generate STL function in Visual C++.
MORE INFORMATION
Required Header<algorithm>
Prototypetemplate<class InputIterator, class Function> inline Function for_each(InputIterator first, InputIterator last, Function F)template<class ForwardIterator, class Generator> inline void generate(ForwardIterator first, ForwardIterator last, Generator gen)NOTE: The class/parameter names in the prototype do not match the version in the header file. Some have been modified to improve readability.
DescriptionThe Generate algorithm traverses the range [first, last + 1), assigning to each element the value returned by gen. Generate modifies the elements in the specified range.
Sample Code
////////////////////////////////////////////////////////////////////// // // Compile options needed: /GX // // generate.cpp : Illustrates how to use the generate function. // // Functions: // // generate - Fill a sequence using a generator function // Fibonacci - return the next Fibonacci number in the // Fibonacci series. // // Written by Kalindi Sanghrajka // of Microsoft Product Support Services, // Software Core Developer Support. // Copyright (c) 1996 Microsoft Corporation. All rights reserved. ////////////////////////////////////////////////////////////////////// // disable warning C4786: symbol greater than 255 character, // okay to ignore#pragma warning(disable: 4786)
#include <iostream> #include <vector> #include <algorithm> // return the next Fibonacci number in the // Fibonacci series. int Fibonacci(void){ static int r; static int f1 = 0; static int f2 = 1; r = f1 + f2 ; f1 = f2 ; f2 = r ; return f1 ;}
void main(){ const int VECTOR_SIZE = 8 ; // Define a template class vector of integers typedef vector<int, allocator<int> > IntVector ; //Define an iterator for template class vector of integer typedef IntVector::iterator IntVectorIt ; IntVector Numbers(VECTOR_SIZE) ; //vector containing numbers IntVectorIt start, end, it ; start = Numbers.begin() ; // location of first // element of Numbers end = Numbers.end() ; // one past the location // last element of Numbers // fill the range [first, last +1) with a series of // Fibonnaci numbers using the Fibonacci function generate(start, end, Fibonacci) ; // print content of Numbers cout << "Numbers { " ; for(it = start; it != end; it++) cout << *it << " " ; cout << " }\n" << endl ;} Program Output is: Numbers { 1 1 2 3 5 8 13 21 }
REFERENCESVisual C++ Books Online; click "Visual C++ Books," "C/C++," then "Standard C++ Library Reference."
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Additional query words: STL generate
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