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Showing content from https://en.cppreference.com/w/cpp/language/../utility/functional/bit_or.html below:

std::bit_or - cppreference.com

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.

[edit] 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) [edit] 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) [edit] 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.

[edit] Exceptions

May throw implementation-defined exceptions.

Possible implementation

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

[edit] 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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