Re: std::generate and Function Adaptors

From:
"Victor Bazarov" <v.Abazarov@comAcast.net>
Newsgroups:
comp.lang.c++
Date:
Wed, 27 Jun 2007 17:58:02 -0400
Message-ID:
<f5umhb$ds$1@news.datemas.de>
Fei Liu wrote:

Bill Woessner wrote:

I'm trying to replace a loop with a call to std::generate and I'm
about at wits end. Here's the working code:

std::vector<double>::iterator it;
std::vector<double> data(100);
RandomGenerator<double> g;

for(it = data.begin(); it != data.end(); ++it)
{
  *it = g.GetGaussian();
}

This works fine. So I thought I could use std::generate to
accomplish the same thing. I've tried lots of combinations, but
this is the one I thought most likely to work:

std::generate(data.begin(), data.end(),
std::bind1st(std::mem_fun(&RandomGenerator<double>::GetGaussian),
&g));

I thought this should work because GetGaussian effectively has one
parameter, namely the object it's being invoked on. However, when I
try to compile this, I get a slew of errors about first_argument_type
and second_argument_type not being defined.

Any thoughts?

Thanks in advance,
Bill


because you don't need bind1st, try
std::generate(data.begin(), data.end(),
std::mem_fun(&RandomGenerator<double>::GetGaussian));


How is 'generate' going to know what object to call it for?

V
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