String to number conversions with gcc 4.2.

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String to number conversions with gcc 4.2.

Subject: String to number conversions with gcc 4.2.
From: Robert Bell <email@hidden>
Date: Thu, 03 Sep 2009 10:21:41 -0700

Hi all,

I noticed some different behaviour with release vs. debug mode when using istringstream. Not sure if it is something I am doing, but too make sure I grabbed the "standard" example from http://www.parashift.com/c++-faq-lite/misc-technical-issues.html#faq-39.2.

It's probably something else I am doing that is stupid in the new environment, but it looks like in debug mode, an exception is being thrown in:

template<typename _Facet>

inline const _Facet&

__check_facet(const _Facet* __f)

{

if (!__f)

__throw_bad_cast();

return *__f;

}

Here is what I put into a simple command line too using c++ stdc++:

------

#include <iostream>

#include <sstream>

#include <string>

#include <stdexcept>

class BadConversion : public std::runtime_error{

public:

BadConversion(const std::string& s)

: std::runtime_error(s)

{ }

};

inline double convertToDouble(const std::string& s)

{

std::istringstream i(s);

double x;

if (!(i >> x))

throw BadConversion("convertToDouble(\"" + s + "\")");

return x;

}

int main (int argc, char * const argv[]){

double d = 0.0;

std::string s = "9877.0";

d = convertToDouble(s);

std::cout << "d: " << d << std::endl;

return 0;

}

------

Here is the output in the different modes (release and debug). I turned off stopping on exception throw to let it fall through.

------

[Session started at 2009-09-03 10:07:15 -0700.]

GNU gdb 6.3.50-20050815 (Apple version gdb-1344) (Fri Jul 3 01:19:56 UTC 2009)

GDB is free software, covered by the GNU General Public License, and you are

welcome to change it and/or distribute copies of it under certain conditions.

Type "show copying" to see the conditions.

There is absolutely no warranty for GDB. Type "show warranty" for details.

This GDB was configured as "x86_64-apple-darwin".tty /dev/ttys002

Loading program into debugger…

Program loaded.

run

[Switching to process 4968]

Running…

d: 9877

Debugger stopped.

Program exited with status value:0.

[Session started at 2009-09-03 10:08:17 -0700.]

GNU gdb 6.3.50-20050815 (Apple version gdb-1344) (Fri Jul 3 01:19:56 UTC 2009)

GDB is free software, covered by the GNU General Public License, and you are

welcome to change it and/or distribute copies of it under certain conditions.

Type "show copying" to see the conditions.

There is absolutely no warranty for GDB. Type "show warranty" for details.

This GDB was configured as "x86_64-apple-darwin".tty /dev/ttys003

Loading program into debugger…

sharedlibrary apply-load-rules all

Program loaded.

run

[Switching to process 4983]

Running…

terminate called after throwing an instance of 'BadConversion'

what(): convertToDouble("9877.0")

Program received signal: “SIGABRT”.

(gdb)

------

Thanks,

Robert.

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