[英]How can I use boost::bind to bind a class member function?
#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();
}
boost::bind(&player::play, &thePlayer)
You need to use placeholders for the two arguments: 您需要为两个参数使用占位符:
boost::bind(&player::play, &thePlayer, _1, _2)
The placeholders allow you to say "I'm only binding certain arguments; other arguments will be provided later." 占位符允许您说“我仅绑定某些参数;稍后将提供其他参数”。
如果要创建可移植的代码,请直接指定占位符的名称空间:
boost::bind( &player::play, &thePlayer, ::_1, ::_2 ); // Placeholders of boost::bind are placed in global namespace.
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