It is a logical AND function object class and binary function object class whose call returns the result of the logical "and" operation between its two arguments (as returned by operator &&).
DeclarationFollowing is the declaration for std::logical_and.
template <class T> struct logical_and;C++11
template <class T> struct logical_and;Parameters
T − It is a type of the arguments and return type of the functional call.
Return Valuenone
Exceptionsnoexcep − It doesn't throw any exceptions.
ExampleIn below example explains about std::logical_and.
#include <iostream> #include <functional> #include <algorithm> int main () { bool foo[] = {true,false,true,false}; bool bar[] = {true,true,false,false}; bool result[4]; std::transform (foo, foo+4, bar, result, std::logical_and<bool>()); std::cout << std::boolalpha << "Logical AND:\n"; for (int i=0; i<4; i++) std::cout << foo[i] << " AND " << bar[i] << " = " << result[i] << "\n"; return 0; }
Let us compile and run the above program, this will produce the following result −
Logical AND: true AND true = true false AND true = false true AND false = false false AND false = false
functional.htm
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