NAME¶

std::logical_and - std::logical_and

Synopsis¶

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

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.
(since C++14)
logical_and<void> function object implementing x && y deducing
(C++14) argument and return types
(class template specialization)

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 (until C++11)
std::binary_function<T, T, bool>.

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