import std.stdio;
import std.string;

template Tuple( T... )
{
	align(1) struct Tuple
	{
		static if( T.length > 0 ) { T[0] first; }
		static if( T.length > 1 ) {	T[1] second; }
		static if( T.length > 2 ) {	T[2] third; }
		static if( T.length > 3 ) {	T[3] fourth; }
		static if( T.length > 4 ) {	T[4] fifth; }
		static if( T.length > 5 ) {	T[5] sixth; }
		static if( T.length > 6 ) {	T[6] seventh; }
		static if( T.length > 7 ) {	T[7] eighth; }
		static if( T.length > 8 ) {	T[8] ninth; }
		// ... etc if more than 9 elements are needed
	}
}

byte[] pack(T...)( T tuple )
{
	int size = 0;
	
	foreach( item; tuple )
		size += item.sizeof;
	
	byte[] result = new byte[size];
	
	int position = 0;
	
	foreach( item; tuple )
	{
		result[position..position+item.sizeof] = (cast(byte*)&item)[0..item.sizeof];
		position += item.sizeof;
	}
	
	return result;
}

Tuple!(T) unpack(T...)( byte[] data )
{
	Tuple!(T) result;
	
	assert( data.length == result.sizeof );
	
	result = *(cast(Tuple!(T)*)data.ptr);
	
	return result;
}

void main()
{
	byte[] packed = pack!(char,short,float)( 'a', 1, 2.3 );
	
	auto unpacked = unpack!(char,short,float)( packed );
	
	foreach( i; unpacked.tupleof )
		writefln( i );
}