On Wed, Aug 16, 2017 at 11:00:43AM -0400, Yury Selivanov wrote:
> "Context" is an established term for what PEP 550 tries to accomplish.
> It's used in multiple languages and runtimes, and while researching
> this topic I didn't see anybody confused with the concept on
> StackOverflow/etc.
For me a context is a "single thing" that is usually used to thread state
through functions.
I guess I'd call "environment" what you call "context".
> In C:
>
> PyContextItem * _current_ctx = PyContext_NewItem("decimal context");
> if (_current_ctx == NULL) { /* error */ }
>
> # later when you set decimal context
> PyDecContextObject *ctx;
> ...
> if (PyContext_SetItem(_current_ctx, (PyObject*)ctx)) { /* error */ }
>
> # whenever you need to get the current context
> PyDecContextObject *ctx = PyContext_GetItem(_current_ctx);
> if (ctx == NULL) { /* error */ }
> if (ctx == Py_None) { /* not initialized, nothing is there */ }
Thanks! This makes it a lot clearer.
I'd probably use (stealing Nick's key suggestion):
PyEnvKey *_current_context_key = PyEnv_NewKey("___DECIMAL_CONTEXT__");
...
PyDecContextObject *ctx = PyEnv_GetItem(_current_ctx_key);
Stefan Krah
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