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

Function object for performing bitwise OR. Effectively calls operator| on type T.


The standard library provides a specialization of std::bit_or 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
(class template specialization)
(since C++14)

Member types

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

Member functions

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


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

Returns the result of bitwise OR of lhs and rhs.


lhs, rhs - values to compute bitwise OR of

Return value

The result of lhs | rhs.



Possible implementation

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

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