Re: Problem with stripping white spaces and references!?

From:

"=?iso-8859-1?q?Erik_Wikstr=F6m?=" <eriwik@student.chalmers.se>

Newsgroups:

comp.lang.c++

Date:

3 Apr 2007 03:42:12 -0700

Message-ID:

<1175596932.797675.103590@q75g2000hsh.googlegroups.com>

On 3 Apr, 10:21, delyan.nesto...@gmail.com wrote:

Hi All,

I have the following problem:
I read lines from DXF file ( AutoCAD format file ). Then I need to
remove white spaces from lines to continue working on data i.e.
converting from string to int and so on. My StripWhiteSpace function
works in test program:

Can't help you with your code but I can give you something else that
might be usedful, the following code can be used to convert strings to
a number of types (all the native builtin) even if there are spaces:

#include <iostream>
#include <sstream>
#include <string>

/*
* Converts a string to some other type. The type converted to must
* have a std::ostream& operator>>(std::ostream&, T) method declared.
* Works for all built-in types.
*/
template <class T>
T stoa(const std::string& s)
{
  T t;
  std::istringstream iss(s);
  if (!(iss >> t))
    throw std::string("Can't convert '") + s +
      "' to '" + typeid(t).name() + "'\n";
  return t;
}

int main()
{
  std::string s = " -54 ";
  try {
    int d = stoa<int>(s);
  } catch(std::string& s) {
    std::cout << s;
  }
  return 0;
}

It's my own adoption of the code from the FAQ:
http://www.parashift.com/c++-faq-lite/misc-technical-issues.html#faq-39.2

--
Erik Wikstr=F6m