dstruct | DStruct lets you properly encapsulate
kandi X-RAY | dstruct Summary
kandi X-RAY | dstruct Summary
DStruct lets you properly encapsulate your simple value objects so your interfaces are extensible from day one, plus add schema enforcement to catch data problems at object initialization time. Encapsulate, encapsulate, encapsulate!
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Top functions reviewed by kandi - BETA
- Returns a dictionary of required attributes
- Recursively extract classes from clazz
- Remove duplicates from a list
dstruct Key Features
dstruct Examples and Code Snippets
Community Discussions
Trending Discussions on dstruct
QUESTION
By my reading of the standard,
*(_Atomic TYPE*)&(TYPE){0}
(in words, casting a pointer to a non-atomic to a pointer to a corresponding atomic and dereferencing) isn't supported.
Do gcc and/or clang recognize it as an extension if TYPE
is/isn't lock-free? (Question 1)
Second and related question: I was under the impression that if TYPE
couldn't be implemented as a lock free atomic, a lock would need to be embedded in the corresponding _Atomic TYPE
. But if I make TYPE
a largish struct, then on both clang
and gcc
it has the same size as _Atomic TYPE
.
Code for both problems:
...ANSWER
Answered 2019-Mar-22 at 13:00_Atomic
changes alignment in some corner cases on Clang, and GCC will likely be fixed in the future as well (PR 65146). In these cases, adding _Atomic
through a cast does not work (which is fine from a C standard point of view because it is undefined behavior, as you pointed out).
If the alignment is correct, it is more appropriate to use the __atomic
builtins, which have been designed for exactly this use case:
As described above, this will not work in cases where the ABI provides insufficient alignment for plain (non-atomic) types, and where _Atomic
would change alignment (with Clang only for now).
These builtins also work in case of non-atomic types because they use out-of-line locks. This is also the reason why no additional storage is required for _Atomic
types, which use the same mechanism. This means that there is some unnecessary contention due to unintentional sharing of the locks. How these locks are implemented is an implementation detail which could change in future versions of libatomic
.
In general, for types with atomic builtins that involve locking, using them with shared or aliased memory mappings does not work. These builtins are not async-signal-safe, either. (All these features are technically outside the C standard anyway.)
QUESTION
I'm experimenting with C++11, constexpr and auto.
I'm failing to understand why this code does not compile:
...ANSWER
Answered 2019-Jan-24 at 13:12Consider the following a long comment instead of an answer (sorry).
I don't know who is right (MSVS that accept all, g++ that accept f
but refuse g
or clang++ that refuse both f
and g
) but, if I understand correctly, this is a simplification of a more complex problem that you can't solve simply using int
and int *
instead of auto
.
So I propose to insert a couple of types inside TestEle2
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Install dstruct
You can use dstruct like any standard Python library. You will need to make sure that you have a development environment consisting of a Python distribution including header files, a compiler, pip, and git installed. Make sure that your pip, setuptools, and wheel are up to date. When using pip it is generally recommended to install packages in a virtual environment to avoid changes to the system.
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