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generate_n

Replaces n elements with the result of an operation
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Definition

The generate_n() algorithm is defined in the standard header <algorithm> and in the nonstandard backward-compatibility header <algo.h>.

Interface

#include <algorithm>
template < class OutputIterator, class Diff, class Generator >
   void generate_n(
      OutputIterator first, 
      Diff count, 
      Generator gen
   );

Parameters:
Parameter Description
first An output iterator addressing the position of first element in the range to which values are to be assigned
count A signed or unsigned integer type specifying the number of elements to be assigned a value by the generator function
gen A function object that is called with no arguments that is used to generate the values to be assigned to each of the elements in the range

Description

Generate_n algorithm does the same thing that generate but with n elements after the first.

Return Value

None.

Complexity

The complexity is linear; count calls to the generator being required.
Example:

Example - generate_n algorithm
Problem
This program illustrates the functionality of generate_n() algorithm.
Workings
#include <vector>
#include <deque>
#include <algorithm>
#include <iostream>
#include <ostream>
 
using namespace std;
 
int main()
{
  // Assigning random values to vector integer elements
  vector <int> v1 ( 5 );
  vector <int>::iterator Iter1;
  deque <int> deq1 ( 5 );
  deque <int>::iterator d1_Iter;

generate_n ( v1.begin ( ), 5 , rand );

cout <<"Vector v1 is ( " ; for ( Iter1 = v1.begin( ) ; Iter1 != v1.end( ) ; Iter1++ ) cout <<*Iter1<<" "; cout <<")."<<endl;   // Assigning random values to deque integer elements generate_n ( deq1.begin ( ), 3 , rand );   cout <<"Deque deq1 is ( " ; for ( d1_Iter = deq1.begin( ) ; d1_Iter != deq1.end( ) ; d1_Iter++ ) cout <<*d1_Iter<<" "; cout <<")."<<endl;   return 0; }
Solution
Output:

Vector v1 is ( 41 18467 6334 26500 19169 ).
Deque deq1 is ( 15724 11478 29358 0 0 ).
References