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Allocator replacement check


Allocator replacement check

By : user2955727
Date : November 22 2020, 10:48 AM
fixed the issue. Will look into that further Set environment variable TBB_VERSION=1 to see verbose information output from tbb.so and tbbmalloc.so
code :


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Is one allowed to call allocator::deallocate() in a different order than one called allocator::allocate()?

Is one allowed to call allocator::deallocate() in a different order than one called allocator::allocate()?


By : Asad Farooq
Date : March 29 2020, 07:55 AM
I think the issue was by ths following ,
Calls to these functions that allocate or deallocate a particular unit of storage shall occur in a single total order, and each such deallocation call shall happen before the next allocation (if any) in this order.
code :
reads -> deallocation -> allocation -> writes
reads -> deallocation
allocation -> writes
Copy stateful allocator: standard library allocator semantics and internal memory

Copy stateful allocator: standard library allocator semantics and internal memory


By : Neha Garg
Date : March 29 2020, 07:55 AM
Hope this helps The allocator requirements say that copies of an allocator must be able to free each others' memory, so it is not generally possible to store the memory inside the allocator object.
This must be valid:
code :
using IAllocChar = internal_allocator<char, 1024>;
IAllocChar::pointer p
IAllocChar a1;
{
  IAllocChar a2(a1);
  p = std::allocator_traits<IAllocChar>::allocate(a2, 1);
}
std::allocator_traits<IAllocChar>::deallocate(a1, p, 1)
using IAllocChar = internal_allocator<char, 1024>;
using IAllocInt = std::allocator_traits<IAllocChar>::rebind_alloc<int>;
IAllocChar ac;
auto pc = ac.allocate(1);  // got bored typing allocator_traits ;-)
IAllocInt  ai(ac);
auto pi = ai.allocate(1);
IAllocChar(ai).deallocate(pc, 1);
IAllocInt(ac).deallocate(pi, 1);
Are STL containers allowed to skip calling allocator::construct and allocator::destroy if the object is trivially constr

Are STL containers allowed to skip calling allocator::construct and allocator::destroy if the object is trivially constr


By : Gdr-apriliomitchluck
Date : March 29 2020, 07:55 AM
will be helpful for those in need The question is in the title. Is this allowed for containers, or are the allocator's methods guaranteed to be called even when the object is trivially constructible/destructible? , § 23.2.1 [container.requirements.general]/p3:
code :
~optional();
Is there a better way to do this than writing a wrapper allocator that stores a reference to a stateful allocator object

Is there a better way to do this than writing a wrapper allocator that stores a reference to a stateful allocator object


By : user3794290
Date : March 29 2020, 07:55 AM
Does that help The standard "Allocator" concept would have been better named "AllocatorReference." Each object either refers to a global instance (stateless) or to an external object (stateful).
Either way, the allocator instance within an allocator-aware container does not own a memory pool by itself. It's only a proxy. Note that allocator objects are often copied as they are rebound and returned by value. You don't want vector::get_allocator to copy a whole memory pool.
Xcode5.1.1 and Xcode6 beta7 iOS7.1 64-bit [Allocator] Allocator invalid, falling back to malloc

Xcode5.1.1 and Xcode6 beta7 iOS7.1 64-bit [Allocator] Allocator invalid, falling back to malloc


By : ddfhv sn
Date : March 29 2020, 07:55 AM
this one helps. For me, this is an issue with Crashlytics when running a 64-bit Simulator. Crashlytics is aware of the problem and say they're working on it.
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