W3cubDocs

operator==,!=(std::allocator)

	(1)
template< class T1, class T2 > bool operator==( const allocator<T1>& lhs, const allocator<T2>& rhs ) throw();		(until C++11)
template< class T1, class T2 > bool operator==( const allocator<T1>& lhs, const allocator<T2>& rhs ) noexcept;		(since C++11) (until C++20)
template< class T1, class T2 > constexpr bool operator==( const allocator<T1>& lhs, const allocator<T2>& rhs ) noexcept;		(since C++20)
	(2)
template< class T1, class T2 > bool operator!=( const allocator<T1>& lhs, const allocator<T2>& rhs ) throw();		(until C++11)
template< class T1, class T2 > bool operator!=( const allocator<T1>& lhs, const allocator<T2>& rhs ) noexcept;		(since C++11) (until C++20)

Compares two default allocators. Since default allocators are stateless, two default allocators are always equal.

1) Returns true.

2) Returns false.

The != operator is synthesized from operator==.

(since C++20)

lhs, rhs

default allocators to compare

1) true

2) false

© cppreference.com
Licensed under the Creative Commons Attribution-ShareAlike Unported License v3.0.
https://en.cppreference.com/w/cpp/memory/allocator/operator_cmp