[PyTorch] Update Synchronized<T>::withLock() to return the type/value from the aceepted callable #74108
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… from the aceepted callable Currently, `void c10::Synchronized<T>::withLock(CB)` accepts a callback but returns `void`. For a callback (CB) returning a value, `withLock()` can not be used to retrieve the returned value. This change makes it possible for the caller to retrieve that value. The only gotcha is that if the value has only move semantics (such as `std::unique_ptr<T>`, then this won't work as currently written). To be able to do that, one needs to use `std::enable_if<T>` to enable a separate overload that works only for moveable types (detectable using `std::is_move_constructible<T>`). Differential Revision: [D34822915](https://our.internmc.facebook.com/intern/diff/D34822915/) [ghstack-poisoned]
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This was referenced Mar 11, 2022
… type/value from the aceepted callable" Currently, `void c10::Synchronized<T>::withLock(CB)` accepts a callback but returns `void`. For a callback (CB) returning a value, `withLock()` can not be used to retrieve the returned value. This change makes it possible for the caller to retrieve that value. The only gotcha is that if the value has only move semantics (such as `std::unique_ptr<T>`, then this won't work as currently written). To be able to do that, one needs to use `std::enable_if<T>` to enable a separate overload that works only for moveable types (detectable using `std::is_move_constructible<T>`). Differential Revision: [D34822915](https://our.internmc.facebook.com/intern/diff/D34822915/) [ghstack-poisoned]
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Mar 16, 2022
… from the aceepted callable (#74108) Summary: Pull Request resolved: #74108 Currently, `void c10::Synchronized<T>::withLock(CB)` accepts a callback but returns `void`. For a callback (CB) returning a value, `withLock()` can not be used to retrieve the returned value. This change makes it possible for the caller to retrieve that value. The only gotcha is that if the value has only move semantics (such as `std::unique_ptr<T>`, then this won't work as currently written). To be able to do that, one needs to use `std::enable_if<T>` to enable a separate overload that works only for moveable types (detectable using `std::is_move_constructible<T>`). ghstack-source-id: 151471745 Test Plan: Built model tracer using the command: ``` buck build -c pt.disable_per_op_profiling=0 -c pt.enable_record_kernel_dtype=1 --show-output xplat/caffe2/fb/model_tracer:model_tracer ``` Reviewed By: malfet Differential Revision: D34822915 fbshipit-source-id: 2ade3d963d1e997a791508ec54a930827f7849b5
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release notes: cpp
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Stack from ghstack (oldest at bottom):
Currently,
void c10::Synchronized<T>::withLock(CB)accepts a callback but returnsvoid. For a callback (CB) returning a value,withLock()can not be used to retrieve the returned value. This change makes it possible for the caller to retrieve that value. The only gotcha is that if the value has only move semantics (such asstd::unique_ptr<T>, then this won't work as currently written). To be able to do that, one needs to usestd::enable_if<T>to enable a separate overload that works only for moveable types (detectable usingstd::is_move_constructible<T>).Differential Revision: D34822915