module tailconst2;

import std.range;
import tailconst;

/**
 *  Example range implementing what is needed for tail-const.
**/
struct SimpleRange( T ) {
	T innerRange;
	mixin tailConst!( .SimpleRange, Tail!T );
	
	static if ( !is( T == .TailMutable!T ) ) {
		this( SimpleRange.TailImmutable r ) {
			innerRange = r.innerRange;
		}
	}
	static if ( !is( T == .TailImmutable!T ) ) {
		this( SimpleRange.TailMutable r ) {
			innerRange = r.innerRange;
		}
	}
	static if ( !is( T == .TailConst!T ) ) {
		.TailConst!SimpleRange get( ) {
			return TailConst( this );
		}
		alias get this;
	}
	
	this( SimpleRange r ) {
		innerRange = r.innerRange;
	}
	
	this( T t ) {
		innerRange = t;
	}
	
	auto front( ) {
		return innerRange.front;
	}
	
	void popFront( ) {
		innerRange.popFront( );
	}
	
	bool empty( ) {
		return innerRange.empty;
	}
	
	SimpleRange save( ) {
		return this;
	}
}

SimpleRange!T simpleRange( T )( T r ) {
	return SimpleRange!T( r );
}

void main( ) {
	int[] a = [1,2,3];
	auto o = simpleRange( a );
	TailConst!( typeof( o ) ) c = o;
	immutable(int)[] b = [4,5,6];
	auto p = simpleRange( b );
	TailConst!( typeof( p ) ) d = p;
}