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Cracow, 20.09.2004

Hi,

I want to replace:

char *text;
double val = strtod(text,NULL);

by an equivalent using std::string in the place of char *.

The construct:

std::string text;
double val = strtod(text.c_str(),NULL);

works, but isn't there any more elegant possibility,
specifically suited for std::string ?

Sincerely,

L.B.

*-------------------------------------------------------------------*
| Dr. Leslaw Bieniasz, |
| Institute of Physical Chemistry of the Polish Academy of Sciences,|
| Department of Electrochemical Oxidation of Gaseous Fuels, |
| ul. Zagrody 13, 30-318 Cracow, Poland. |
| tel./fax: +48 (12) 266-03-41 |
| E-mail: |
*-------------------------------------------------------------------*
| Interested in Computational Electrochemistry? |
| Visit my web site: http://www.cyf-kr.edu.pl/~nbbienia |
*-------------------------------------------------------------------*

Leslaw Bieniasz <> writes:


> Cracow, 20.09.2004

>Hi,

>I want to replace:

> char *text;
> double val = strtod(text,NULL);

>by an equivalent using std::string in the place of char *.
See
http://www.parashift.com/c++-faq-lit....html#faq-38.2

"Leslaw Bieniasz" <> wrote in message news-=
> char *text;
> double val = strtod(text,NULL);
>
> by an equivalent using std::string in the place of char *.
>
double val;
std::istringstream(text) >> val;

Leslaw Bieniasz <> wrote in message news:<>...
> Cracow, 20.09.2004
>
> Hi,
>
> I want to replace:
>
> char *text;
> double val = strtod(text,NULL);
>
> by an equivalent using std::string in the place of char *.
>
> The construct:
>
> std::string text;
> double val = strtod(text.c_str(),NULL);
>
> works, but isn't there any more elegant possibility,
> specifically suited for std::string ?
>
> Sincerely,
>
> L.B.
>
> *-------------------------------------------------------------------*
> | Dr. Leslaw Bieniasz, |
> | Institute of Physical Chemistry of the Polish Academy of Sciences,|
> | Department of Electrochemical Oxidation of Gaseous Fuels, |
> | ul. Zagrody 13, 30-318 Cracow, Poland. |
> | tel./fax: +48 (12) 266-03-41 |
> | E-mail: |
> *-------------------------------------------------------------------*
> | Interested in Computational Electrochemistry? |
> | Visit my web site: http://www.cyf-kr.edu.pl/~nbbienia |
> *-------------------------------------------------------------------*


A string stream is the normal approach which is encapsulated nicely
for you in boost::lexical_cast.

Reference: http://www.boost.org/libs/conversion/lexical_cast.htm

Example code FYI:

#include <iostream>
#include <boost/lexical_cast.hpp>

int main()
{
std::string s_value("3.141592654");

double d_value = boost::lexical_cast<double>(s_value);

std::cout << d_value << "\n";
}

It works the other way too, i.e. boost::lexical_cast<std::string>(
3.14 ) will give you a string.

HTH,

Matt Hurd
www.hurd.com.au