将函数连接到 boost::signal 运行，但不调用该函数
我的代码中有一个类 Yarl，其中包含一个成员函数 refresh，我想将其绑定到两个 boost::signal。其中一个信号是定义如下的类 EventHandler 的成员：
class EventHandler {
public:
boost::signal<void()> sigRefresh;
};
另一个是另一个文件中的自由浮动信号，声明如下：
namespace utility {
static boost::signal<void()> signal_refresh;
}
在 Yarl 的成员函数中，我将 refresh 连接到这样的信号：
events::EventHandler eventHandler;
eventHandler.sigRefresh.connect(boost::bind(&Yarl::refresh, this));
utility::signal_refresh.connect(boost::bind(&Yarl::refresh, this));
然后我像这样调用两个信号：
sigRefresh();
signal_refresh();
此代码编译并运行，并且 sigRefresh 完全按照预期工作。但是，当我调用 signal_refresh 时，没有任何反应。据我所知，refresh实际上从未连接到signal_refresh。有人看到我做错了什么吗？
I have a class Yarl in my code with a member function refresh that I want to bind to two boost::signals. One of these signals is a member of a class EventHandler defined like this:
class EventHandler {
public:
boost::signal<void()> sigRefresh;
};
The other is a free floating signal in another file declared like this:
namespace utility {
static boost::signal<void()> signal_refresh;
}
in a member function of Yarl, I connect refresh to the signals like this:
events::EventHandler eventHandler;
eventHandler.sigRefresh.connect(boost::bind(&Yarl::refresh, this));
utility::signal_refresh.connect(boost::bind(&Yarl::refresh, this));
and later on I call both signals like this:
sigRefresh();
signal_refresh();
This code compiles and runs, and sigRefresh works exactly as expected. However, nothing happens when I call signal_refresh. As far as I can tell, refresh never actually got connected to signal_refresh. Anyone see what I'm doing wrong?
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我猜测您正在多重定义 signal_refresh。声明之前的 static 关键字向我表明代码片段位于头文件中，您必须将 static 放在那里才能使其编译而不会出现重新定义的符号错误。如果您这样做了，那么每个源文件（包括标头）都将获得 signal_refresh 的唯一副本，因此您正在调用的实例可能不是您连接到的实例。
我可能完全偏离了主题，但这是可能的。
I'm taking a guess that you are multiply defining signal_refresh. The static keyword before it's declaration suggests to me the code snippet is in a header file and you had to put the static there to get it to compile without redefined symbol errors. If you have done this then every source file including the header will get a unique copy of signal_refresh and thus the instance you are calling may not be the instance you connected it to.
I may be totally off mark here but it is possible.