Re: How to use generate_n to fill vector<MyInt>, with explicit MyInt(int) ctor?

From:

"terry" <news1@lyonstech.net>

Newsgroups:

comp.lang.c++.moderated

Date:

19 Nov 2006 03:52:19 -0500

Message-ID:

<B5mdndDptI2Nlv3YRVnyhA@eclipse.net.uk>

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I would try something like

class wrap

{

int (*myfunc) ();

public:

wrap (int (*func) ()) : myfunc(func){};

MyInt operator()(){return MyInt(myfunc());};

};

................

wrap myrandint(rand);

generate_n(back_inserter(v), 30, myrandint);

and if I were going to do it often I would template wrap.

Dont know if this is useful. Perhaps there is a predefined method available.

Terry

"Terry G" <tjgolubi@netins.net> wrote in message
news:ejnupn$k09$1@news.netins.net...

This doesn't quite work.
What is the proper way to do this?
terry

class MyInt {
  int _value;
public:
  explicit MyInt(int x=0) : _value(x) { }
  int value() const { return _value; }
}; // MyInt

int main() {
  vector<MyInt> v;

  // HOW TO DO THIS USING GENERATE_N?
  // for (int i=0; i!=30; ++i) v.push_back(MyInt(rand()));
  generate_n(back_inserter(v), 30, bind(MyInt, bind(rand))); // compile
error

  // Now print v.
  transform(v.begin(), v.end(), ostream_iterator<int>(cout, "\n"),
      mem_fn(&MyInt::value));

  return 0;
} // main

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