std::logical_or (3) - Linux Manuals

std::logical_or: std::logical_or


std::logical_or - std::logical_or


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

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


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 (since C++14)
logical_or<void> (class template specialization)

Member types

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

Member functions

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


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.


lhs, rhs - values to compute logical OR of

Return value

The result of lhs || rhs.



Possible implementation

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