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Full Discussion: is this a bug of g++?
Top Forums Programming is this a bug of g++? Post 302503710 by Corona688 on Friday 11th of March 2011 11:30:30 AM
Old 03-11-2011
It sounds like the same or similar problem as scanf() in C: It throws up on bad data but doesn't actually discard the bad data.

In C the usual approach is to read strings line-by-line with fgets or getline (fgets preferred because there's some very broken getline implementations out there), then feed the line into sscanf. Whether sscanf succeeds or not, the data is out of the input stream and out of your way.

C++ doesn't have special string-only functions, it uses stringstream to make a string act like ss>>var>>var; instead. Whether reading your vars from the string succeeds or not, the data is out of cin and can't come back to haunt you.

Here's an example.
 

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Text::Context(3pm)					User Contributed Perl Documentation					Text::Context(3pm)

NAME
Text::Context - Handle highlighting search result context snippets SYNOPSIS
use Text::Context; my $snippet = Text::Context->new($text, @keywords); $snippet->keywords("foo", "bar"); # In case you change your mind print $snippet->as_html; print $snippet->as_text; DESCRIPTION
Given a piece of text and some search terms, produces an object which locates the search terms in the message, extracts a reasonable-length string containing all the search terms, and optionally dumps the string out as HTML text with the search terms highlighted in bold. new Creates a new snippet object for holding and formatting context for search terms. keywords Accessor method to get/set keywords. As the context search is done case-insensitively, the keywords will be lower-cased. paras @paras = $self->paras($maxlen) Return shortened paragraphs to fit together into a snippet of at most $maxlen characters. as_text Calculates a "representative" string which contains the given search terms. If there's lots and lots of context between the terms, it's replaced with an ellipsis. as_html([ start => "<some tag>", end => "<some end tag>" ]) Markup the snippet as a HTML string using the specified delimiters or with a default set of delimiters ("<span class="quoted">"). AUTHOR
Original author: Simon Cozens Current maintainer: Tony Bowden BUGS and QUERIES Please direct all correspondence regarding this module to: bug-Text-Context@rt.cpan.org COPYRIGHT AND LICENSE
Copyright (C) 2002-2005 Kasei This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. perl v5.10.1 2009-07-23 Text::Context(3pm)
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