boost::algorithm::equal() in C++ library - GeeksforGeeks

17 Jun, 2019
The equal() function in C++ boost library is found under the header ‘boost/algorithm/cxx11/equal.hpp’ tests to see if two sequences contain equal values. It returns a boolean value which determines if both the sequences are same or not.
Syntax:
bool equal ( InputIterator1 first1, InputIterator1 second1,
                  InputIterator2 first2, InputIterator2 second2 )
or 
bool equal ( InputIterator1 first1, InputIterator1 second1,
             InputIterator2 first2, InputIterator2 second2, 
             BinaryPredicate pred )

Parameters: The function accepts parameters as described below:
first1: It specifies the input iterators to the initial positions in the first sequence.
second1: It specifies the input iterators to the final positions in the first sequence.first2: It specifies the input iterators to the initial positions in the second sequence.second2: It specifies the input iterators to the final positions in the second sequence.p: It specifies the comparison predicate if specified.Return Value: The function returns true if both the sequence are same, else it returns false.Note: The above function runs for C++14 and above.Program-1:// C++ program to implement the// above mentioned function  #include <bits/stdc++.h>#include <boost/algorithm/cxx14/equal.hpp>using namespace std;  // Drivers codeint main(){      // Declares the sequences    int a[] = { 1, 2, 5, 6, 8 };      int b[] = { 1, 2, 5, 6, 8 };      // Run the function    bool ans        = boost::algorithm::equal(a, a + 5, b, b + 5);      // Condition to check    if (ans == 1)        cout << "Sequence1 and Sequence2 are equal";    else        cout << "Sequence1 and Sequence2 are not equal";    return 0;}Output:Sequence1 and Sequence2 are equal
Program-2:// C++ program to implement the// above mentioned function  #include <bits/stdc++.h>#include <boost/algorithm/cxx14/equal.hpp>using namespace std;  // Drivers codeint main(){      // Declares the sequences    int a[] = { 1, 2, 5, 6, 8 };      int b[] = { 1, 2, 5 };      // Run the function    bool ans        = boost::algorithm::equal(a, a + 5, b, b + 5);      // Condition to check    if (ans == 1)        cout << "Sequence1 and Sequence2 are equal";    else        cout << "Sequence1 and Sequence2 are not equal";    return 0;}Output:Sequence1 and Sequence2 are not equal
Reference: https://www.boost.org/doc/libs/1_70_0/libs/algorithm/doc/html/algorithm/CXX14.html#the_boost_algorithm_library.CXX14.equalMy Personal Notes
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first2: It specifies the input iterators to the initial positions in the second sequence.
second2: It specifies the input iterators to the final positions in the second sequence.
p: It specifies the comparison predicate if specified.
Return Value: The function returns true if both the sequence are same, else it returns false.
Note: The above function runs for C++14 and above.
Program-1:
// C++ program to implement the// above mentioned function  #include <bits/stdc++.h>#include <boost/algorithm/cxx14/equal.hpp>using namespace std;  // Drivers codeint main(){      // Declares the sequences    int a[] = { 1, 2, 5, 6, 8 };      int b[] = { 1, 2, 5, 6, 8 };      // Run the function    bool ans        = boost::algorithm::equal(a, a + 5, b, b + 5);      // Condition to check    if (ans == 1)        cout << "Sequence1 and Sequence2 are equal";    else        cout << "Sequence1 and Sequence2 are not equal";    return 0;}
Sequence1 and Sequence2 are equal

Program-2:
// C++ program to implement the// above mentioned function  #include <bits/stdc++.h>#include <boost/algorithm/cxx14/equal.hpp>using namespace std;  // Drivers codeint main(){      // Declares the sequences    int a[] = { 1, 2, 5, 6, 8 };      int b[] = { 1, 2, 5 };      // Run the function    bool ans        = boost::algorithm::equal(a, a + 5, b, b + 5);      // Condition to check    if (ans == 1)        cout << "Sequence1 and Sequence2 are equal";    else        cout << "Sequence1 and Sequence2 are not equal";    return 0;}
Sequence1 and Sequence2 are not equal

Reference: https://www.boost.org/doc/libs/1_70_0/libs/algorithm/doc/html/algorithm/CXX14.html#the_boost_algorithm_library.CXX14.equal
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