These are the global template operator functions defined in <allocators>. For class member operator functions, see the class documentation.

operator!=
operator==

Tests for inequality between allocator objects of a specified class.

template <class Type, class Sync>
bool operator!=(
    const allocator_base<Type, Sync>& left,
    const allocator_base<Type, Sync>& right);

left
One of the allocator objects to be tested for inequality.

right
One of the allocator objects to be tested for inequality.

true if the allocator objects are not equal; false if allocator objects are equal.

The template operator returns !(left == right).

Tests for equality between allocator objects of a specified class.

template <class Type, class Sync>
bool operator==(
    const allocator_base<Type, Sync>& left,
    const allocator_base<Type, Sync>& right);

left
One of the allocator objects to be tested for equality.

right
One of the allocator objects to be tested for equality.

true if the allocator objects are equal; false if allocator objects are not equal.

This template operator returns left.equals(right).

<allocators>