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std::logical_and

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.

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

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

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

(none).

Possible implementation

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

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http://en.cppreference.com/w/cpp/utility/functional/logical_and