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

 

C++

Compiler support

Freestanding and hosted

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Named requirements

Feature test macros(C++20)

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Technical specifications

Symbols index

External libraries

 

Containers library

node-handle (C++17)

Sequence

array (C++11)

vector

vector<bool>

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hive (C++26)

deque

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list

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unordered_set (C++11)

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unordered_map (C++11)

unordered_multimap (C++11)

Adaptors

stack

queue

priority_queue

flat_set (C++23)

flat_multiset (C++23)

flat_map (C++23)

flat_multimap (C++23)

Views

span (C++20)

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Iterator invalidation

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std::stack

Member functions

stack::stack

stack::~stack

stack::operator=

Element access

stack::top

Capacity

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

swap(std::stack) (C++11)

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

Helper classes

uses_allocator<std::stack> (C++11)

formatter<std::stack> (C++23)

Deduction guides(C++17)

 

template<class T, class Container > bool operator==(conststd::stack<T, Container>& lhs,                  conststd::stack<T, Container>& rhs );	(1)
template<class T, class Container > bool operator!=(conststd::stack<T, Container>& lhs,                  conststd::stack<T, Container>& rhs );	(2)
template<class T, class Container > bool operator<(conststd::stack<T, Container>& lhs,                  conststd::stack<T, Container>& rhs );	(3)
template<class T, class Container > bool operator<=(conststd::stack<T, Container>& lhs,                  conststd::stack<T, Container>& rhs );	(4)
template<class T, class Container > bool operator>(conststd::stack<T, Container>& lhs,                  conststd::stack<T, Container>& rhs );	(5)
template<class T, class Container > bool operator>=(conststd::stack<T, Container>& lhs,                  conststd::stack<T, Container>& rhs );	(6)
template<class T, std::three_way_comparable Container > std::compare_three_way_result_t<Container>     operator<=>(conststd::stack<T, Container>& lhs,                  conststd::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