The clamp() function in C++ boost library is found under the header ‘boost/algorithm/clamp.hpp’ contains two functions for “clamping” a value between a pair of boundary values.

Syntax:

const T& clamp ( const T& val, const T& lo, const T& hi )
or 
const T& clamp ( const T& value, const T& low, const T& high, Pred p )

Parameters: The function accepts parameters as described below:

• value: This speifies the value compared to.
• low: This specifies the lower range.
  • high: This specifies the higher range.
  • p: This specifies the predicate function.

  Return Value: The function returns three values as described below:

  • It returns low if value is less than low.
  • It returns high if high is greater than value.
  • In all other cases, it returns value.

  Program-1:

  
  
  
  
  
  

  
  
  

  // C++ program to implement the // above mentioned function    #include <bits/stdc++.h> #include <boost/algorithm/clamp.hpp> using namespace std;    // Drivers code int main() {        int value = 5;     int low = 10, high = 20;        // Function used     int ans         = boost::algorithm::clamp(value, low, high);        cout << ans;     return 0; }
  Output:

  10
  

  Program-2:

  
  

  
  
  

  // C++ program to implement the // above mentioned function    #include <bits/stdc++.h> #include <boost/algorithm/clamp.hpp> using namespace std;    // Drivers code int main() {        int value = 25;     int low = 10, high = 20;        // Function used     int ans         = boost::algorithm::clamp(value, low, high);     cout << ans;     return 0; }
  Output:

  20
  

  Program-3:

  
  

  
  
  

  // C++ program to implement the // above mentioned function    #include <bits/stdc++.h> #include <boost/algorithm/clamp.hpp> using namespace std;    // Drivers code int main() {        int value = 15;     int low = 10, high = 20;        // Function used     int ans         = boost::algorithm::clamp(value, low, high);     cout << ans;     return 0; }
  Output:

  15
  

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

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