std::bit_or - cppreference.com

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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.

Specializations

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 parameter and return types
(class template specialization) [edit]

(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

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

std::bit_or::operator()

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

Returns the result of bitwise OR of lhs and rhs.

Parameters

lhs, rhs

values to compute bitwise OR 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