Boost C++ Libraries: Ticket #11047: Valgrind warning "uninitialized variable" with lexical_cast on empty string as target

attachment set

aedo99@… — Wed, 18 Feb 2015 17:13:24 GMT

viboes — Thu, 26 Mar 2015 07:32:39 GMT

anonymous — Wed, 30 Sep 2015 12:24:29 GMT

Hello,

any news on this?

Antony Polukhin — Wed, 30 Sep 2015 20:03:01 GMT

Antony Polukhin — Wed, 30 Sep 2015 20:16:31 GMT

Looks like this issue was fixed somewhere between 1.47-1.59.

New code correctly handles empty strings:

on empty string m_begin == m_end
Decrementing `m_end` without dereferencing
`m_begin > m_end` is `true`, which will prevent the compiler from evaluating the expression further, false will be returned.
exception is thrown

Thanks for reporting this issue anyway!

If you need a fix for Boost 1.47, then just replace the line

if ( *end < czero || *end >= czero + 10 || begin > end)

with

if (begin > end || *end < czero || *end >= czero + 10)