问题描述
我一直认为函数指针不需要和号：
I've always believed that function pointers don't require an ampersand:
然而，我看到的每个例子使用 boost :: bind 显示一个，而且在大多数情况下，我的编译器如果省略它，会给出一个通常不可更改的错误消息。
Yet, every example I've seen of using boost::bind shows one, and my compiler - in most situations - gives a typically inscrutable error message if it's omitted.
synchronize(boost::bind(&Device::asyncUpdate , this, "ErrorMessage")); // Works
synchronize(boost::bind(Device::asyncUpdate , this, "ErrorMessage")); // Fails
假设 boost :: bind 的第一个参数基本上是函数指针？
Am I wrong in assuming that boost::bind's first parameter is basically function pointer?
推荐答案
函数指针不需要它，成员函数指针。
Function pointers don't need it, member function pointers do.
Device :: asyncUpdate 是成员函数，因为你可以猜到，因为它被绑定到这。
Device::asyncUpdate is member function, as you could guess because it is being bound to this.
这是从n3337,5.3.1 / 4的规范性引文
Here's a normative quote from n3337, 5.3.1/4
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