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

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< cpp‎ | memory‎ | memory resource

Defined in header `<memory_resource>` |  |
bool operator==( const std::pmr::memory_resource& a, const std::pmr::memory_resource& b ) noexcept; | (1) | (since C++17)
bool operator!=( const std::pmr::memory_resource& a, const std::pmr::memory_resource& b ) noexcept; | (2) | (since C++17) (until C++20)

Compares the `memory_resource`s a and b for equality. 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.

The `!=` operator is synthesized from `operator==`. | (since C++20)

### Return value

1) &a == &b || a.is_equal(b)
2) !(a == b)

### See also

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

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