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by DLoupe 584 days ago
> The safety checks have uncovered over 1,000 bugs

In most implementations of the standard library, safety checks can be enabled with a simple #define. In some, it's the default behavior in DEBUG mode. I wonder what this library improves on that and why these bugs have not been discovered before.
3 comments
pjmlp 584 days ago
Being actually enforced, even in release.

Most folks don't use those #defines, and many still haven't leaned about them.

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dataflow 584 days ago
It's a great question (_LIBCPP_DEBUG was already a thing in libc++), and AFAIK the answer is supposedly "it used to be too costly to enable these in production with libc++, and it no longer is." I have no first-hand insight as to how accurate this perception is.
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alpire 584 days ago
That's exactly right. We've had extra hardening enabled in tests, and that does catch many issues. But tests can't exercise every potential out-of-bounds issue, which is why enabling it prod enabled us to find & fix additional issues.
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saagarjha 584 days ago
They turned those on and 1. checked that the software using it didn't break and 2. made sure it didn't tank performance.

Source: I worked on this apparently

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