Comment by Chaosvex
12 hours ago
Saying it doesn't even do bounds checking (in release builds) is to miss one of the major points of C++ - not paying for what you don't need. It's not a mistake, it's a feature.
You complain about it not being suitable for game development in one comment but then expect bounds checking in release builds? You're sitting in multiple lanes at the same time.
NIH implementations are usually grossly inferior because as it turns out, it's quite hard to get it right and those edge-cases aren't important until you start getting bitten by them when you'd rather be shipping features.
> bounds checking in release builds
Bounds checking overhead is negligible for all but the absolutely hottest code paths (fwiw we shipped active asserts, including bounds checking asserts in all the PC games I was involved with - carefully monitoring the overhead of course).
The main reason to not use the stdlib isn't so much about squeezing out the last bit of performance, but about control of what actually happens under the hood (and also compilation times). The overall runtime cost of all those active asserts (not just the range checks, everything) was somewhere in the 2..3% range, which is fine when budgeted for upfront.
That's your opinion, others won't agree and would much rather not pay the price at all.
Those asserts probably saved a lot of development costs and increased the robustness of the software, which is worth a lot more than a few percent on a benchmark.
I personally am more conservative on those things. I'll pick the fastest thing that is reliable.
4 replies →
The point is that STL does make you pay for stuff you don't need. In complexity and compile times. There's reasons Jai is being developed, and they're not all that Jonathon Blow is weird. As much as C++ owns the game industry right now, it has observable deficits as a great game programming language.
Sometimes there are ways of getting runtime bounds checking.
For example, both of these return the 3rd element of a std::vector:
Yes, with the trade-off of essentially requiring exceptions, which are also banned in some codebases.