Good to the last drop.

[WhatMeWorry via Digitalmars-d-learn]

I run the program (at the bottom) and get, as expected, the 
run-time out of memory error:

PS C:\D\sandbox> .\Reserve.exe
  newCapacity = [              1]
  newCapacity = [              3]
  newCapacity = [              5]
                o    o    o
  newCapacity = [    905,207,293]
  newCapacity = [    905,207,805]
  newCapacity = [    905,208,317]
core.exception.OutOfMemoryError@src\core\lifetime.d(126): Memory 
allocation failed


Is there a way to programmatically determine the exact maximum 
memory size available to the DRuntime’s array implementation?


import std.stdio;
import std.format;

void main()
{
    ulong[] big;
    size_t newCapacity;
    size_t oldCapacity;
        
    foreach(i; 0..ulong.max)
    {
        newCapacity = big.reserve(i);
        if(oldCapacity != newCapacity)
        {
            writeln("  newCapacity = ", format("[%15,3d]", 
newCapacity) );
            oldCapacity = newCapacity;
        }
    }
}