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std::pmr::operator==, std::pmr::operator!=

template< class T1, class T2 >
bool operator==( const std::pmr::polymorphic_allocator<T1>& lhs,
                 const std::pmr::polymorphic_allocator<T2>& rhs ) noexcept;

template< class T1, class T2 >
bool operator!=( const std::pmr::polymorphic_allocator<T1>& lhs,
                 const std::pmr::polymorphic_allocator<T2>& rhs ) noexcept;

Compares two polymorphic allocators. Two polymorphic allocators compare equal if their underlying memory resource compares equal.

1) Returns *lhs.resource() == *rhs.resource()

2) Returns !(lhs == rhs)

Parameters

lhs, rhs

polymorphic allocators to compare

Return value

1) *lhs.resource() == *rhs.resource()

2) !(lhs == rhs)

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http://en.cppreference.com/w/cpp/memory/polymorphic_allocator/operator_eq