randomIO, std.file, core.stdc.stdio

[Rene Zwanenburg via Digitalmars-d-learn]

On Wednesday, 27 July 2016 at 02:20:57 UTC, Charles Hixson wrote:
> O, dear.  It was sounding like such an excellent approach until 
> this
> last paragraph, but growing the file is going to be one of the 
> common
> operations.  (Certainly at first.) (...)
> So I'm probably better off sticking to using a seek based i/o 
> system.

Not necessarily. The usual approach is to over-allocate your file 
so you don't need to grow it that often. This is the exact same 
strategy used by D's dynamic arrays and grow-able array-backed 
lists in other languages - the difference between list length and 
capacity.

There is no built-in support for this in std.mmfile afaik. But 
it's not hard to do yourself.