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

 

C++

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Feature test macros (C++20)

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Technical specifications

Symbols index

External libraries

 

Containers library

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array (C++11)

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list

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Adaptors

stack

queue

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flat_set (C++23)

flat_multiset (C++23)

flat_map (C++23)

flat_multimap (C++23)

Views

span (C++20)

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std::stack

Member functions

stack::stack

stack::~stack

stack::operator=

Element access

stack::top

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stack::empty

stack::size

Modifiers

stack::push

stack::push_range (C++23)

stack::emplace (C++11)

stack::pop

stack::swap (C++11)

Non-member functions

operator==operator!=operator<operator>operator<=operator>=operator<=> (C++20)

std::swap (C++11)

Helper classes

std::uses_allocator (C++11)

Deduction guides(C++17)

 

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.

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