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# std::logical_or

From cppreference.com
< cpp‎ | utility‎ | functional

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`.

### [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.
logical_or<void> | function object implementing x || y deducing argument and return types (class template specialization) [edit]
| (since C++14)

### [edit] Member types

Type | Definition
`result_type`(deprecated in C++17) | `bool`
`first_argument_type`(deprecated in C++17) | `T`
`second_argument_type`(deprecated in C++17) | `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;
    }

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