array of struct to struct of arrays

gistfile1.d

import std.stdio;
import std.traits;

struct Test
{
	double a;
	long b;
	string c;
}

string repackIntoArray(name)(string newname)
{
	string ret=
	"
	struct "~newname~"
	{
		";
	auto members=unpack!name;
	foreach(member;members)
		ret~=member~";"~"\n\t\t";
	ret~="
	}
	";
	return ret;
}

auto unpack(U)()
{
	string[] ret;
	auto types=unpackTypeTuple!(FieldTypeTuple!U);
	auto names=unpackNameTuple!(FieldNameTuple!U);
	//static assert(types.length=names.length);
	foreach(i,type;types)
	{
		ret~=type~"[] "~names[i];
	}
	return ret;
}

void main(string[] args)
{
	Test[] t;
	mixin(repackIntoArray!Test("TestArray"));
	TestArray t2;
	t2.a=[1,2,3];
	writefln("%s",t2);
}

template unpackTypeTuple(args...)
{
	string[] unpackTypeTuple()
	{
		string[] ret;
		foreach(a;args)
			ret~=a.stringof;
		return ret;
	}
}

template unpackNameTuple(args...)
{
	string[] unpackNameTuple()
	{
		string[] ret;
		foreach(a;args)
			ret~=a;
		return ret;
	}
}