What's the boost way to create a functor that binds out an argument
- by Mordachai
I have need for a function pointer that takes two arguments and returns a string.
I would like to pass an adapter that wraps a function that takes one argument, and returns the string (i.e. discard one of the arguments).
I can trivially build my own adapter, that takes the 2 arguments, calls the wrapped function passing just the one argument through.
But I'd much rather have a simple way to create an adapter on the fly, if there is an easy way to do so in C++/boost?
Here's some details to make this a bit more concrete:
typedef boost::function<CString (int,int)> TooltipTextFn;
class MyCtrl
{
public:
MyCtrl(TooltipTextFn callback = boost::bind(&MyCtrl::GetCellText, this, _1, _2)) : m_callback(callback) { }
// QUESTION: how to trivially wrapper GetRowText to conform to TooltipTextFn by just discarding _2 ?!
void UseRowText() { m_callback = boost::bind(&MyCtrl::GetRowText, this, _1, ??); }
private:
CString GetCellText(int row, int column);
CString GetRowText(int row);
TooltipTextFn m_callback;
}
Obviously, I can supply a member that adapts GetRowText to take two arguments and only passes the first to GetRowText() itself.
But is there already a boost binder / adapter that lets me do that?
