c – 如何使用boost :: bind绑定类成员函数？

#include <QtCore/QCoreApplication>
#include <boost/bind.hpp>
#include <boost/function.hpp>

class button
{
 public:

    boost::function<void()> onClick;
    boost::function<void(int,double )> onClick2;
};

class player
{
 public:
    void play(int i,double o){}
    void stop(){}
};

button playButton,stopButton;
player thePlayer;

void connect()
{
    //error C2298: 'return' : illegal operation on pointer to member function expression 
    playButton.onClick2 = boost::bind(&player::play,&thePlayer);
    stopButton.onClick = boost::bind(&player::stop,&thePlayer);
}

int main(int argc,char *argv[])

{

    QCoreApplication a(argc,argv);
    connect();
    return a.exec();
}

解决方法

boost::bind(&player::play,&thePlayer)

您需要为两个参数使用占位符：

boost::bind(&player::play,&thePlayer,_1,_2)

占位符允许您说“我只绑定某些参数;其他参数将在稍后提供.”