Re: Function that requires a function as an argument (brent_find_minima)?

I try to use a function that minimizes another function (namely from the
Boost library: brent_find_minima). When I provide the function to be
minized at the very top level (ie, in the .cpp file) and call
brent_find_minima from the main block, it works fine but when I create a
class and define the function to be minimized in there (and also call
brent_find_minima in another function in that class), I get this error
during compilation:
error: argument of type double (Testclass::)(double) does not match
double (Testclass::*)(double)

I had invoked brent_find_minima with this line (which works when called
in main);
std::pair<double, double> result =
boost::math::tools::brent_find_minima(TrickyF, min, max, bits);

I started with this example:
http://net.pku.edu.cn/~webg/src/paradise/thirdparty/installed/include/boost-1_35/boost/math/tools/minima.hpp