std::logical_or - cppreference.com (original) (raw)

| Defined in header | | | | -------------------------------------------------------------------------------------- | | ------------- | | 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

• 1 Specializations
• 2 Member types
• 3 Member functions
• 4 std::logical_or::operator()
  • 4.1 Parameters
  • 4.2 Return value
  • 4.3 Exceptions
  • 4.4 Possible implementation

[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 parameter and return types (class template specialization) [edit] | (since C++14) | | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------- |

[edit] Member types

[edit] Member functions

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

std::logical_or::operator()

| bool operator()( const T& lhs, const T& rhs ) const; | | (constexpr since C++14) | | ---------------------------------------------------- | | ----------------------- |

Returns the logical OR of lhs and rhs.

Parameters

Return value

The result of lhs || rhs.

[edit] Exceptions

May throw implementation-defined exceptions.

Possible implementation

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