AFAICT, the program below should run successfully to completion.
$ cat -n u.cpp && g++ u.cpp -static && ./a.out
1 #include <cassert>
2 #include <sstream>
3
4 struct pubbuf: std::stringbuf {
5 using std::stringbuf::eback;
6 using std::stringbuf::egptr;
7 using std::stringbuf::pbase;
8 using std::stringbuf::pptr;
9 using std::stringbuf::epptr;
10 using std::stringbuf::overflow;
11 };
12
13 int main ()
14 {
15 struct: std::stringbuf {
16 using std::stringbuf::eback;
17 using std::stringbuf::egptr;
18 using std::stringbuf::pbase;
19 using std::stringbuf::pptr;
20 using std::stringbuf::epptr;
21 using std::stringbuf::overflow;
22 } buf;
23
24 // 27.7.1.1, p1 and 27.5.2.1, p1:
25 assert (0 == buf.pbase () && 0 == buf.pptr () && 0 == buf.epptr
());
26
27 // 27.7.1.3, p5, bullet 1:
28 assert ('x' == buf.overflow ('x'));
29
30 // 27.7.1.3, p5, bullet 1 and 27.5.2.2.5, p1:
31 assert (1 == buf.pptr () - buf.pbase ());
32
33 // not required but good for efficiency:
34 const int write_positions = buf.epptr () - buf.pbase ();
35 assert (1 < write_positions);
36
37 // 27.7.1.3, p8:
38 assert (write_positions == buf.egptr () - buf.eback ());
39 }
40
Assertion failed: write_positions == buf.egptr () - buf.eback (), file u.cpp,
line 38
Abort (core dumped)
--
Summary: stringbuf::overflow() fails to set egptr() same as
epptr()
Product: gcc
Version: 4.0.2
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: sebor at roguewave dot com
GCC build triplet: all
GCC host triplet: all
GCC target triplet: all
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26250
