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From "Martin Sebor (JIRA)" <>
Subject [jira] Created: (STDCXX-229) better exception error messages
Date Wed, 28 Jun 2006 18:36:29 GMT
better exception error messages

         Key: STDCXX-229
     Project: C++ Standard Library
        Type: Improvement

  Components: 18. Language Support, 19. Diagnostics  
    Versions: 4.1.2, 4.1.3    
 Environment: all
    Reporter: Martin Sebor

****Created By: sebor @ Apr 24, 2001 12:11:59 PM****
Subject: better exception error messages (by using CRTL's strerror()?) (1601)
Date: Tue, 24 Apr 2001 10:57:13 -0400

A customer requested that the what() string for a standard iostream
error be more descriptive, possibly by using the strerror() or
perror() function to return the underlying CRTL error string...


#include <fstream>
#include <string>

int main() {
    try {
        std::ofstream out;
        out << "Hello!" << std::endl;
    catch (std::exception& e) {
        perror("The funny looking name that isn't in scope anymore");
        std::cerr << e.what();
------------------------------- test.cxx -------------------------------

$ run test
The funny looking name that isn't in scope anymore: non-translatable vms 
error code: 0x186D4 %rms-f-syn, file specification syntax error
iostream object has failbit set

****Modified By: sebor @ Sep 29, 2003 11:44:10 AM****
This would be quite useful but it's non trivial to do in iostreams where exceptions are thrown
from stream classes but errors of interest typically occur in stream buffers. Once possibility
is to selectively capture and save errno in a thread-safe way (so that it can be later modified
w/o affecting the recorded cause of the original error) when it occurs during libc and system
calls made from streambuf members and later retrieve it when an exception is about to be thrown
from the stream class.

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