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信号和具约束力的论据
原标题:Signals and binding arguments

我使用 boost::: signals2 库,这里是简单的代码:

boost::signals2<void ()> sig;
class Foo {
   void Slot() {}
};

Foo obj;
sig.connect( boost.bind(&Foo::Slot, &obj) );

一切都很好,但现在我要我的信号 通过一些数据在争论中:

boost::signals2<void (std::vector<float>)> sig2;
class Foo {
   void Slot2(std::vector<float>) {}
};

将Slot2连接到再次信号的正确方式是什么?

这里是错误 : < a href=" "http://dpaste.com/752076" rel="no follow" >http://dpaste.com/752076 当我使用相同的连接和amp; 具有约束力的代码时 。

最佳回答

您需要使用占位符 :

sig.connect( boost::bind(&Foo::Slot, &obj, _1) );
问题回答

您需要阅读 < a href=>", http://www.boost.org/doc/libs/1_49_0/doc/html/ignals2/tutitual.html#ignals2/tutional.html#ignals2.tutial. connection-management" rel=“nofollow” >Autommatic connective management , 在那里,在如何连接需要争论的时段上也有类似的例子。

在你的情况中,是这样的:

#include <boost/signals2.hpp>
#include <vector>

struct Foo {
   void Slot1() {}
   void Slot2(std::vector<float>) {}
};

int main()
{
    typedef boost::signals2::signal<void ()> st1;
    typedef st1::slot_type sst1;
    typedef boost::signals2::signal<void (std::vector<float>)> st2;
    typedef st2::slot_type sst2;

    st1 sig1;
    st2 sig2;

    Foo foo;

    sig1.connect( sst1( &Foo::Slot1, foo ) );
    sig2.connect( sst2( &Foo::Slot2, foo, _1 ) );

    sig1();
    std::vector<float> v(5,2.2);
    sig2( v );
}




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