[Boost-users] [lambda] smart self binding of a function object

sorry for double posting, the first message had the wrong subject [lamda] instead of [lambda]. On May 11, 3:11 am, alfC wrote:

Hi,

 I usually have function-classes that take two arguments.

class f{  double operator()(double x, double y) const { x*y+y; }

};

called as:

f myf; cout << myf(4.,3.);

for some purposes I need a function of only one variable (parametrized in the first or second argument. So I end up doing:

using boost::function; using namespace boost::lambda; function myf_at5 = bind(&f::operator(), myf, 5., _1); // myf_at5 is myf(5.,*)

So, now I can pass myf_at5 to something that accepts a function of one variable.

root_finder( myf_at5, ...);

since I have access to f I would like to make f smart enough to handle its own binding. Eg.

class f{   ... // same as before  function operator()(double x_value, YYYY y_arg){    return bind(          &f::operator(), //maybe needs cast to double(*) (double,double)          *this,          x_value,          y_arg    );  }  function operator()(XXXX x_arg, double y_value){    return bind(       &f::operator(), //maybe needs cast       *this,       x_arg,       y_value    );  }

};

The question is: What should be the type of XXXX and YYYY?

in such a way that I can just call

root_finder( myf(5., _1) , ... ); or more complicated things like root_finder( myf(5., _1 * 2.), ...);

in other words, myf(5.,_1) is the same as the old  bind(&f::operator(), myf, 5., _1);

Thank you, Alfredo answers using other libraries are also accepted :) _______________________________________________ Boost-users mailing list Boost-us...@lists.boost.orghttp://lists.boost.org/mailman/listinfo.cgi/boost-users

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