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

From cppreference.com

template< class T, class Container >

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

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

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

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

bool operator<( stack<T,Container>& lhs,

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

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

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

bool operator>( stack<T,Container>& lhs,

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

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

                 stack<T,Container>& rhs );
(6)

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

[edit] Parameters

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

[edit] Return value

true if the corresponding comparison yields true, false otherwise.

[edit] Complexity

Linear in the size of the container