20 General utilities library [utilities]

20.12 Memory resources [mem.res]

20.12.2 Class memory_­resource [mem.res.class]

20.12.2.2 Private virtual member functions [mem.res.private]

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virtual void* do_allocate(size_t bytes, size_t alignment) = 0;
1
#
Preconditions: alignment is a power of two.
2
#
Returns: A derived class shall implement this function to return a pointer to allocated storage ([basic.stc.dynamic.allocation]) with a size of at least bytes, aligned to the specified alignment.
3
#
Throws: A derived class implementation shall throw an appropriate exception if it is unable to allocate memory with the requested size and alignment.
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virtual void do_deallocate(void* p, size_t bytes, size_t alignment) = 0;
4
#
Preconditions: p was returned from a prior call to allocate(bytes, alignment) on a memory resource equal to *this, and the storage at p has not yet been deallocated.
5
#
Effects: A derived class shall implement this function to dispose of allocated storage.
6
#
Throws: Nothing.
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virtual bool do_is_equal(const memory_resource& other) const noexcept = 0;
7
#
Returns: A derived class shall implement this function to return true if memory allocated from this can be deallocated from other and vice-versa, otherwise false.
[ Note
:
The most-derived type of other might not match the type of this.
For a derived class D, an implementation of this function could immediately return false if dynamic_­cast<const D*>(&other) == nullptr.
— end note
 ]