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var createCtor = require('./_createCtor'),    root = require('./_root');
/** Used to compose bitmasks for function metadata. */var WRAP_BIND_FLAG = 1;
/** * Creates a function that wraps `func` to invoke it with the optional `this` * binding of `thisArg`. * * @private * @param {Function} func The function to wrap. * @param {number} bitmask The bitmask flags. See `createWrap` for more details. * @param {*} [thisArg] The `this` binding of `func`. * @returns {Function} Returns the new wrapped function. */function createBind(func, bitmask, thisArg) {  var isBind = bitmask & WRAP_BIND_FLAG,      Ctor = createCtor(func);
  function wrapper() {    var fn = (this && this !== root && this instanceof wrapper) ? Ctor : func;    return fn.apply(isBind ? thisArg : this, arguments);  }  return wrapper;}
module.exports = createBind;