23 General utilities library [utilities]

23.12 Memory resources [mem.res]

23.12.6 Class monotonic_­buffer_­resource [mem.res.monotonic.buffer] monotonic_­buffer_­resource members [mem.res.monotonic.buffer.mem]

void release();

Effects: Calls upstream_­rsrc->deallocate() as necessary to release all allocated memory.

[Note: The memory is released back to upstream_­rsrc even if some blocks that were allocated from this have not been deallocated from this.end note]

memory_resource* upstream_resource() const;

Returns: The value of upstream_­rsrc.

void* do_allocate(size_t bytes, size_t alignment) override;

Returns: A pointer to allocated storage ([basic.stc.dynamic.deallocation]) with a size of at least bytes. The size and alignment of the allocated memory shall meet the requirements for a class derived from memory_­resource.

Effects: If the unused space in current_­buffer can fit a block with the specified bytes and alignment, then allocate the return block from current_­buffer; otherwise set current_­buffer to upstream_­rsrc->allocate(n, m), where n is not less than max(bytes, next_­buffer_­size) and m is not less than alignment, and increase next_­buffer_­size by an implementation-defined growth factor (which need not be integral), then allocate the return block from the newly-allocated current_­buffer.

Throws: Nothing unless upstream_­rsrc->allocate() throws.

void do_deallocate(void* p, size_t bytes, size_t alignment) override;

Effects: None.

Throws: Nothing.

Remarks: Memory used by this resource increases monotonically until its destruction.

bool do_is_equal(const memory_resource& other) const noexcept override;

Returns: this == dynamic_­cast<const monotonic_­buffer_­resource*>(&other).