class MacroTools
{
    // returns an array declaration of length len, filled with values 'val'
    @:macro static public function array(len:Int, val:haxe.macro.Expr)
    {
        var arr = [];
        for (i in 0...len)
            arr.push(val);
        return macro $[arr];
    }
}
//--------------------------------------
//usage :
var arr = MacroTools.array(3,-1);
// will be compiled as :
var arr = [-1,-1,-1];