operator==,!=,<,<=,>,>=,<=> (std::stack)

From cppreference.com

C++
Containers library
std::stack
template < class T, class Container >

bool operator == ( const std:: stack < T, Container > & lhs,

const std:: stack < T, Container > & rhs ) ;
(1)
template < class T, class Container >

bool operator ! = ( const std:: stack < T, Container > & lhs,

const std:: stack < T, Container > & rhs ) ;
(2)
template < class T, class Container >

bool operator < ( const std:: stack < T, Container > & lhs,

const std:: stack < T, Container > & rhs ) ;
(3)
template < class T, class Container >

bool operator <= ( const std:: stack < T, Container > & lhs,

const std:: stack < T, Container > & rhs ) ;
(4)
template < class T, class Container >

bool operator > ( const std:: stack < T, Container > & lhs,

const std:: stack < T, Container > & rhs ) ;
(5)
template < class T, class Container >

bool operator >= ( const std:: stack < T, Container > & lhs,

const std:: stack < T, Container > & rhs ) ;
(6)
template < class T, std:: three_way_comparable Container >

std:: compare_three_way_result_t < Container >
operator <=> ( const std:: stack < T, Container > & lhs,

const std:: stack < T, Container > & rhs ) ;
(7) (since C++20)

Compares the contents of the underlying containers of two container adaptors. The comparison is done by applying the corresponding operator to the underlying containers.

Parameters

lhs, rhs - container adaptors whose contents to compare
-
T must meet the requirements of EqualityComparable .

Return value

1-6) true if the corresponding comparison yields true , false otherwise.
7) Result of three-way comparison on underlying containers.

Complexity

Linear in the size of the container.

Example

This section is incomplete
Reason: no example

Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

DR Applied to Behavior as published Correct behavior
LWG 410 C++98 the semantics of all comparison operators were missing added
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