Add a correctness check for C++ types to custom operators (#15247)
Summary:
The JIT uses `int64_t` for its integer type and `double` for its floating point type, but users quite often want to write `int` or `float` and that currently fails in not-so-nice ways for custom ops. This PR adds a simple `static_assert` to catch these common failure cases.
zdevito
Pull Request resolved: https://github.com/pytorch/pytorch/pull/15247
Differential Revision: D13493941
Pulled By: goldsborough
fbshipit-source-id: c1cd0d10ab5838c75f167c0bdb57e45a0bc1344e
