std:: bit_and

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

Function object for performing bitwise AND. Effectively calls operator & on type T .

Specializations

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

(C++14)
function object implementing x & y deducing parameter and return types
(class template specialization)
(since C++14)

Member types

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

These member types are obtained via publicly inheriting std:: binary_function < T, T, T > .

(until C++11)

Member functions

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

std::bit_and:: operator()

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

Returns the result of bitwise AND of lhs and rhs .

Parameters

lhs, rhs - values to compute bitwise AND of

Return value

The result of lhs & rhs .

Exceptions

May throw implementation-defined exceptions.

Possible implementation 

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

Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

DR Applied to Behavior as published Correct behavior
LWG 660 C++98 function objects for bitwise operations are missing added
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