std::logical_and (3) - Linux Manuals

std::logical_and: std::logical_and


std::logical_and - std::logical_and


Defined in header <functional>
template< class T > (until C++14)
struct logical_and;
template< class T = void > (since C++14)
struct logical_and;

Function object for performing logical AND (logical conjunction). Effectively calls operator&& on type T.


The standard library provides a specialization of std::logical_and when T is not specified, which leaves the parameter types and return type to be deduced.

                  function object implementing x && y deducing argument and return types (since C++14)
logical_and<void> (class template specialization)

Member types

Type Definition (until C++20)
result_type(deprecated in C++17) bool
first_argument_type(deprecated in C++17) T
second_argument_type(deprecated in C++17) T

Member functions

           returns the logical AND of the two arguments
operator() (public member function)


bool operator()( const T& lhs, const T& rhs ) const; (until C++14)
constexpr bool operator()( const T& lhs, const T& rhs ) const; (since C++14)

Returns the logical AND of lhs and rhs.


lhs, rhs - values to compute logical AND of

Return value

The result of lhs && rhs.



Possible implementation

  constexpr bool operator()(const T &lhs, const T &rhs) const
      return lhs && rhs;