std:: logical_and

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C++
Utilities library
General utilities
Relational operators (deprecated in C++20)
Function objects
Function invocation
(C++17) (C++23)
Identity function object
(C++20)
Old binders and adaptors
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Defined in header <functional>
template < class T >
struct logical_and ;
(until C++14)
template < class T = void >
struct logical_and ;
(since C++14)

Function object for performing logical AND (logical conjunction). Effectively calls operator && on type T .

Specializations

The standard library provides a specialization of std::logical_and when T is not specified, which leaves the parameter types and return type to be deduced.

(C++14)
function object implementing x && y deducing parameter and return types
(class template specialization)
(since C++14)

Member types

Type Definition
result_type (deprecated in C++17) (removed in C++20) bool
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, bool > .

(until C++11)

Member functions

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

std::logical_and:: operator()

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

Returns the logical AND of lhs and rhs .

Parameters

lhs, rhs - values to compute logical AND of

Return value

The result of lhs && rhs .

Exceptions

May throw implementation-defined exceptions.

Possible implementation 

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