https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120548
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Assignee|unassigned at gcc dot gnu.org |redi at gcc dot gnu.org
Status|NEW |ASSIGNED
--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
This is the fix:
--- a/libstdc++-v3/include/std/format
+++ b/libstdc++-v3/include/std/format
@@ -2398,9 +2398,16 @@ namespace __format
const size_t __r = __str.size() - __e; // Length of remainder.
auto __overwrite = [&](_CharT* __p, size_t) {
// Apply grouping to the digits before the radix or exponent.
- auto __end = std::__add_grouping(__p, __np.thousands_sep(),
+ int __off = 0;
+ if (__str.front() == '-' || __str.front() == '+')
+ {
+ *__p = __str.front();
+ __off = 1;
+ }
+ auto __end = std::__add_grouping(__p + __off, __np.thousands_sep(),
__grp.data(), __grp.size(),
- __str.data(), __str.data() + __e);
+ __str.data() + __off,
+ __str.data() + __e);
if (__r) // If there's a fractional part or exponent
{
if (__d != __str.npos)
