[boost] [Boost-bugs] [ boost-Bugs-1485069 ] program_options: format_paragraph assert fails on long line

From: SourceForge.net (noreply_at_[hidden])
Date: 2006-05-09 17:50:26

Bugs item #1485069, was opened at 2006-05-09 14:50
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Category: None
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Kevin J Bluck (kbluck)
Assigned to: Nobody/Anonymous (nobody)
Summary: program_options: format_paragraph assert fails on long line

Initial Comment:
Boost 1.33.1, MSVC 8.0

When format_paragraph() in options_description.cpp
attempts to format a line that will wrap because it is
> 80 chars, it causes an assert failure in the standard
library string iterator's operator+=(). The offending
po:: code line is options_description.cpp Line 361:

if (line_begin + (line_length - indent) > par_end)
...

Relevant call stack attached.

My guess is that the assert is complaining that the +
operation has produced an iterator past the string's
end(); this code seems to be assuming that the iterator
object is a pointer. I believe it is officially
undefined to advance an iterator past end().

One way of getting around this might be to use
std::distance instead of comparing the iterators directly.

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