classAllocate.d

import std.stdio;

class C
{
	this(string arg = "")
	{
		writeln("constructor is called." ~ arg);
	}
	
	~this()
	{
		writeln("destructor is called.");
	}
}

T allocate(T, Args...)(Args args)
{
	import std.conv : emplace;
	import core.stdc.stdlib : malloc;

	auto size = __traits(classInstanceSize, T);

	auto memory = malloc(size)[0..size];
	if(!memory)
	{
		import core.exception : onOutOfMemoryError;
		onOutOfMemoryError();
	}

	return emplace!(T, Args)(memory, args);
}

void deallocate(T)(T obj)
{
	import core.stdc.stdlib : free;
	destroy(obj);

	free(cast(void*)obj);
}

void main()
{
	auto test = allocate!C("YEAH!");
	scope (exit) deallocate(test);
}