Re: Fast GC allocation of many small objects

[Boris-Barboris via Digitalmars-d-learn]

On Friday, 30 March 2018 at 20:31:35 UTC, Per Nordlöw wrote:

Is there a faster way of allocating many small class objects such as...

maybe something like this:

import std.conv: to;
import std.stdio;

class Node {}

class StrNode : Node
{
    string value;
}

void main()
{
    writeln(StrNode.classinfo.name);    // onlineapp.StrNode
    size_t il = StrNode.classinfo.m_init.length;
    writeln(il); // 32
    void[] backBuf = new void[il * 1000];
    StrNode[] nodes = new StrNode[1000];
    for (int i = 0; i < 1000; i++)
    {
        backBuf[i * il .. (i+1) * il] = StrNode.classinfo.m_init;
        nodes[i] = cast(StrNode) &backBuf[i * il];
        nodes[i].value = i.to!string;
    }
    foreach (n; nodes[995..$])
        writeln(n.classinfo.name, " ", n.value);      
        // prints onlineapp.StrNode 995-999
}