1 | var createCtor = require('./_createCtor'),
|
2 | root = require('./_root');
|
3 |
|
4 | /** Used to compose bitmasks for function metadata. */
|
5 | var WRAP_BIND_FLAG = 1;
|
6 |
|
7 | /**
|
8 | * Creates a function that wraps `func` to invoke it with the optional `this`
|
9 | * binding of `thisArg`.
|
10 | *
|
11 | * @private
|
12 | * @param {Function} func The function to wrap.
|
13 | * @param {number} bitmask The bitmask flags. See `createWrap` for more details.
|
14 | * @param {*} [thisArg] The `this` binding of `func`.
|
15 | * @returns {Function} Returns the new wrapped function.
|
16 | */
|
17 | function createBind(func, bitmask, thisArg) {
|
18 | var isBind = bitmask & WRAP_BIND_FLAG,
|
19 | Ctor = createCtor(func);
|
20 |
|
21 | function wrapper() {
|
22 | var fn = (this && this !== root && this instanceof wrapper) ? Ctor : func;
|
23 | return fn.apply(isBind ? thisArg : this, arguments);
|
24 | }
|
25 | return wrapper;
|
26 | }
|
27 |
|
28 | module.exports = createBind;
|