Memory request check available memory

[castholm]

@ericlang

I need a big hashtable in my program. Can I check before creating if the size is not to big?

The right thing to do in this instance is probably not to try to ask the allocator/OS how much memory is left, instead, consider reserving all the memory you need up front using APIs like initCapacity or ensureTotalCapacity and then use the *AssumeCapacity or *Bounded APIs to insert elements. This way, if there’s not enough memory left, your request will fail immediately instead of halfway through populating your data structure.