[Bug libstdc++/59829] Calling vector::data() occurs undefined behavior when the vector is empty

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59829

--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Author: redi
Date: Wed Jan 29 14:57:42 2014
New Revision: 207241

URL: http://gcc.gnu.org/viewcvs?rev=207241&root=gcc&view=rev
Log:
    PR libstdc++/59829
    * include/bits/stl_vector.h (vector::data()): Call _M_data_ptr.
    (vector::_M_data_ptr): New overloaded functions to ensure empty
    vectors do not dereference the pointer.
    * testsuite/23_containers/vector/59829.cc: New.
    * testsuite/23_containers/vector/requirements/dr438/assign_neg.cc:
    Adjust dg-error line number.
    * testsuite/23_containers/vector/requirements/dr438/
    constructor_1_neg.cc: Likewise.
    * testsuite/23_containers/vector/requirements/dr438/
    constructor_2_neg.cc: Likewise.
    * testsuite/23_containers/vector/requirements/dr438/insert_neg.cc:
    Likewise.

Added:
    trunk/libstdc++-v3/testsuite/23_containers/vector/59829.cc
Modified:
    trunk/libstdc++-v3/ChangeLog
    trunk/libstdc++-v3/include/bits/stl_vector.h
   
trunk/libstdc++-v3/testsuite/23_containers/vector/requirements/dr438/assign_neg.cc
   
trunk/libstdc++-v3/testsuite/23_containers/vector/requirements/dr438/constructor_1_neg.cc
   
trunk/libstdc++-v3/testsuite/23_containers/vector/requirements/dr438/constructor_2_neg.cc
   
trunk/libstdc++-v3/testsuite/23_containers/vector/requirements/dr438/insert_neg.cc