tmp/tmpys1foimb/{from.md → to.md}
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| 1 |
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### Access to program-wide `memory_resource` objects <a id="mem.res.global">[[mem.res.global]]</a>
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``` cpp
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memory_resource* new_delete_resource() noexcept;
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```
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*Returns:* A pointer to a static-duration object of a type derived from
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`memory_resource` that can serve as a resource for allocating memory
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using `::operator new` and `::operator delete`. The same value is
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returned every time this function is called. For a return value `p` and
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a memory resource `r`, `p->is_equal(r)` returns `&r == p`.
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``` cpp
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memory_resource* null_memory_resource() noexcept;
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```
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*Returns:* A pointer to a static-duration object of a type derived from
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`memory_resource` for which `allocate()` always throws `bad_alloc` and
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for which `deallocate()` has no effect. The same value is returned every
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time this function is called. For a return value `p` and a memory
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resource `r`, `p->is_equal(r)` returns `&r == p`.
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The *default memory resource pointer* is a pointer to a memory resource
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that is used by certain facilities when an explicit memory resource is
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not supplied through the interface. Its initial value is the return
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value of `new_delete_resource()`.
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``` cpp
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memory_resource* set_default_resource(memory_resource* r) noexcept;
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```
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*Effects:* If `r` is non-null, sets the value of the default memory
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resource pointer to `r`, otherwise sets the default memory resource
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pointer to `new_delete_resource()`.
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*Postconditions:* `get_default_resource() == r`.
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*Returns:* The previous value of the default memory resource pointer.
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*Remarks:* Calling the `set_default_resource` and `get_default_resource`
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functions shall not incur a data race. A call to the
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`set_default_resource` function shall synchronize with subsequent calls
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to the `set_default_resource` and `get_default_resource` functions.
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``` cpp
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memory_resource* get_default_resource() noexcept;
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```
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*Returns:* The current value of the default memory resource pointer.
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