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[caffe2] Avoid attempt to use undefined preprocessor directive

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Summary:
This is somewhat more verbose, but it's more correct and addresses this warning on Visual Studio 2017:
```
xplat\caffe2\caffe2\core\common.h(76): warning C4067: unexpected tokens following preprocessor directive - expected a newline
```

Test Plan: Built locally with fix

Reviewed By: simpkins

Differential Revision: D28868632

fbshipit-source-id: f6a583e8275162adedb2a4bc5ed0f64847020871
This commit is contained in:
James Donald 2021-06-05 09:21:39 -07:00 committed by Facebook GitHub Bot
parent 1d9c1cc00a
commit 1dcc034fba
1 changed files with 5 additions and 2 deletions
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7
caffe2/core/common.h
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@ -73,9 +73,12 @@ using std::vector;
#define NOMINMAX
#endif
#if defined(__has_cpp_attribute) && __has_cpp_attribute(nodiscard)
#if defined(__has_cpp_attribute)
#if __has_cpp_attribute(nodiscard)
#define CAFFE2_NODISCARD [[nodiscard]]
#else
#endif
#endif
#if !defined(CAFFE2_NODISCARD)
#define CAFFE2_NODISCARD
#endif