Re: Member function as parameter of STL algorithm
many_years_after wrote:
I am studying cpp recently. As is said, member funciton can be as
one parameter of stl algorithm. BUT when I pass member function whose
parameter is instance of the class, it doesn't work. For example:
class Point
{
public:
[...]
bool LargeThan(const Point& p)
[...]
void print()
[...]
};
int main()
{
vector<Point> vec;
[...]
for_each(
vec.begin(),
vec.end(),
mem_fun_ref(&Point::print)); // OK
sort(vec.begin(), vec.end(), mem_fun_ref(&Point::LargeThan)); //
ERROR WHEN COMPILING
return 0;
}
I don't know why it does not work. What's the reasong?
mem_fun_ref doesn't work when the function argument is a
reference. I'd consider it a defect in the standard. At any
rate, the next version of the standard will contain some more
advanced tools for this sort of thing, based on boost::bind. In
the meantime, use boost::bind.
--
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