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;