(function (mod){ 
if (typeof exports == "object" && typeof module == "object") return mod(exports); 
if (typeof define == "function" && define.amd) return define(["exports"] , mod); 
mod((self.tern || (self.tern = { 
}
)).signal = { 
}
); 
} 
)(function (exports){ 
function on(type, f){ 
var handlers = this._handlers || (this._handlers = Object.create(null )); 
(handlers[type] || (handlers[type] = [] )).push(f); 
} 
function off(type, f){ 
var arr = this._handlers && this._handlers[type]; 
if (arr) for (var i = 0; 
i < _AN_Read_length("length", arr); ++i)if (arr[i] == f) { 
arr.splice(i, 1); 
break ; 
} 
} 
function signal(type, a1, a2, a3, a4){ 
var arr = this._handlers && this._handlers[type]; 
if (arr) for (var i = 0; 
i < _AN_Read_length("length", arr); ++i)arr[i].call(this, a1, a2, a3, a4); 
} 
exports.mixin = function (obj){ 
obj.on = on; 
obj.off = off; 
obj.signal = signal; 
return obj; 
} 
; 
} 
);