# std::pmr::memory_resource::do_is_equal

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< cpp‎ | memory‎ | memory resource

virtual bool do_is_equal(const std::pmr::memory_resource& other) const noexcept = 0; |  | (since C++17)

Compares `*this` for equality with `other`.

Two `memory_resource`s compare equal if and only if memory allocated from one `memory_resource` can be deallocated from the other and vice versa.

### Notes

The most-derived type of `other` may not match the most derived type of `*this`. A derived class implementation therefore must typically check whether the most derived types of `*this` and `other` match using dynamic_cast, and immediately return `false` if the cast fails.

### See also

is_equal | compare for equality with another `memory_resource` (public member function)

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