std::logical_and

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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 callsoperator&& on typeT.

[edit]Specializations

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

logical_and<void>

(C++14)

function object implementingx&& y deducing parameter and return types
(class template specialization)[edit]

(since C++14)

[edit]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 inheritingstd::binary_function<T, T,bool>.

(until C++11)

[edit]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 oflhs andrhs.

Parameters

lhs, rhs

values to compute logical AND of

Return value

The result oflhs&& rhs.

[edit]Exceptions

May throw implementation-defined exceptions.

Possible implementation

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

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std::logical_and

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[edit]Specializations

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[edit]Member functions

std::logical_and::operator()

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