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Filename : _createBind.js

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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;