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std::logical_or

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

Function object for performing logical OR (logical disjunction). Effectively calls operator|| on type T.

Contents

[edit] Specializations

The standard library provides a specialization of std::logical_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) [edit]
(since C++14)

[edit] Member types

Type Definition
result_type bool
first_argument_type T
second_argument_type T

[edit] Member functions

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

std::logical_or::operator()

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 OR of lhs and rhs.

Parameters

lhs, rhs - values to compute logical OR of

Return value

The result of lhs || rhs.

Exceptions

(none)

Possible implementation

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