Re: multidimensional vector to list

From:

SG <s.gesemann@gmail.com>

Newsgroups:

comp.lang.c++

Date:

Sun, 2 Jun 2013 01:36:04 -0700 (PDT)

Message-ID:

<972dcaa5-78f6-49dc-82ae-b3530d5cfb3d@g9g2000vbl.googlegroups.com>

On Jun 2, 1:28 am, haiko...@gmail.com wrote:

I'm trying to convert a three dimensional vector to a list.

I have a three dimenional vector of type float, which looks like this:

std::vector< TPoint3D<float> > points;
points.push_back(TPoint3D<float>(x,y,z);

It does not look like a 3-dimensional vector to me.
More like a 1-dimensional vector of 3D points.

And I thought about converting the vector to a list like this:
list<TPoint3D<float>> myList(points.begin(), points.end());

Why? Seriously. Why?
It does not look like a good idea to me.

But I want to filter the values, so that if the z-values are greater
than a certain threshold, they and the corresponding x and y values
from the vector are removed. It works for vectors, because I can
access the values using their indices, but how do you do something
like that with a list?

You don't need random access for processing a list from front to back.

One or two things of these might help you:
  - std::copy_if
  - std::back_inserter
  - Boost's filter_iterator
  - std::list<>::remove_if