https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65230
--- Comment #6 from Ulrich Drepper <drepper.fsp+rhbz at gmail dot com> --- Created attachment 53410 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=53410&action=edit consistent pretty printing of contains How about this patch? I used the attached test case. With the current code 'info locals' at the end of the function prints: t1 = empty std::tuple t2 = std::tuple containing = {[0] = 0} t3 = std::tuple containing = {[0] = 0, [1] = 0} v1 = std::vector of length 0, capacity 0 v2 = std::vector of length 1, capacity 1 = {0} v3 = std::vector of length 2, capacity 2 = {0, 0} va1 = std::vector of length 0, capacity 0 va2 = std::vector of length 1, capacity 1 = {0} va3 = std::vector of length 2, capacity 2 = {0, 0} a1 = {_M_elems = {<No data fields>}} a2 = {_M_elems = {0}} a3 = {_M_elems = {0, 0}} p1 = {first = 0, second = 0} b1 = std::bitset b2 = std::bitset b3 = std::bitset b4 = std::bitset = {[0] = 1} b5 = std::bitset = {[70] = 1} With the patch it prints: t1 = std::tuple<> = {} t2 = std::tuple<int> = {[0] = 0} t3 = std::tuple<int, int> = {[0] = 0, [1] = 0} v1 = std::vector<int> of length 0, capacity 0 = {} v2 = std::vector<int> of length 1, capacity 1 = {0} v3 = std::vector<int> of length 2, capacity 2 = {0, 0} va1 = std::vector<int, va<int> > of length 0, capacity 0 = {} va2 = std::vector<int, va<int> > of length 1, capacity 1 = {0} va3 = std::vector<int, va<int> > of length 2, capacity 2 = {0, 0} a1 = std::array<int, 0> = {} a2 = std::array<int, 1> = {0} a3 = std::array<int, 2> = {0, 0} p1 = std::pair<int, int> = {[0] = 0, [1] = 0} b1 = std::bitset<0> = {} b2 = std::bitset<1> = {} b3 = std::bitset<2> = {} b4 = std::bitset<2> = {[0] = 1} b5 = std::bitset<72> = {[70] = 1} This is quite a change from before but I think quite consistent. NB: also tested with _GLIBXX_DEBUG. There is one point I'm not sure about: should the std::vector printer explicitly show the length (capacity is no question)? This is the one remaining inconsistency. The tuple printer does not explicitly list the number of elements. On the other hand, to avoid making the output too long the std::vector printer does not show the indeces and therefore the number of elements cannot be see right away. So, maybe leave it as is? BTW: notice that I added a pretty printer for std::array and I also added code to recognize a standard allocator template argument to std::vector (which in this case is not shown).
