Use std::equal to compare vectors v1 and v2 for equality : equal « STL Algorithms Non modifying sequence operations

Use std::equal to compare vectors v1 and v2 for equality : equal « STL Algorithms Non modifying sequence operations « C++ Tutorial

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C++ Tutorial » STL Algorithms Non modifying sequence operations » equal

25.6.3.Use std::equal to compare vectors v1 and v2 for equality

#include <iostream>

using std::cout;

using std::endl;



#include <algorithm>

#include <vector>

#include <iterator>



int main()

{

   int a1[ 10 ] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };

   int a2[ 10 ] = { 1, 2, 3, 4, 9, 6, 7, 8, 9, 10 };

   std::vector< int > v1( a1, a1 + 10 );

   std::vector< int > v2( a1, a1 + 10 );

   std::vector< int > v3( a2, a2 + 10 );

   std::ostream_iterator< int > output( cout, " " );



   cout << "Vector v1 contains: ";

   std::copy( v1.begin(), v1.end(), output );

   cout << "\nVector v2 contains: ";

   std::copy( v2.begin(), v2.end(), output );

   cout << "\nVector v3 contains: ";

   std::copy( v3.begin(), v3.end(), output );



   // compare vectors v1 and v2 for equality

   bool result = std::equal( v1.begin(), v1.end(), v2.begin() );

   cout << "\n\nVector v1 " << ( result ? "is" : "is not" )

      << " equal to vector v2.\n";



   return 0;

}

Vector v1 contains: 1 2 3 4 5 6 7 8 9 10
Vector v2 contains: 1 2 3 4 5 6 7 8 9 10
Vector v3 contains: 1 2 3 4 9 6 7 8 9 10

Vector v1 is equal to vector v2.

25.6.equal
	25.6.1.	equal algorithm: a deque and the first 2 elements of a list are not equal in all corresponding positions
	25.6.2.	equal algorithm: a list and the first 3 elements of a vector are equal in all corresponding positions
	25.6.3.	Use std::equal to compare vectors v1 and v2 for equality

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