Gdb debugging C + + program (standard procedure library vector) issue Relatively simple code as follows : 。。。。。。 Int main () { Vector<string> vStr; String's ( "allow tmp_t) (tmpfs_t tmpfs_t:filesystem associate") ;// 12th trip VStr.push_back (s); Cout<<vStr.at (0) "<endl; Cout<<*vStr.begin () "<endl; S.clear (); Return 0 } Able to operate normally, and the output is allow tmpfs_t:filesystem associate) (tmpfs_t tmp_t But when debugging (Gdb) break 12 Breakpoint 1 at 0x8048a8f test2.cpp : file, line 12. (Gdb) r Starting program : /home/dreamping/a.out Breakpoint 1, main () at test2.cpp:12 's 12 string ( "allow tmp_t) (tmpfs_t tmpfs_t:filesystem associate"); (Gdb) n 13 vStr.push_back (s); (Gdb) n 14 cout<<vStr.at (0) "<endl; (Gdb) print vStr.at (0) $ 1 = (string &) : {static0x804a7f8 npos = 4294967295. _M_dataplus = = {<allocator<char>> Fields>} {<No data. _M_p = 0x804a264 "allow tmpfs_t:filesystem associate -- tmpfs_t tmp_t)") Static _S_empty_rep_storage = (0, 0, 0, 0}} (Gdb) p *vStr.begin () $ 2 = (string &) : {static0xbffff98c npos = 4294967295. _M_dataplus = = {<allocator<char>> Fields>} {<No data. _M_p = 0xbffff98c "\001"), static _S_empty_rep_storage = (0, 0, 0,     0}} Very strange and it is reasonable to say that the cases vStr.at (0) and *vStr.begin (), vStr.front () should be at the same ah Static _S_empty_rep_storag _M_dataplus _M_p = 0xbffff98c Debugging C + +, these unknown receivers Eastern mean, Internet has not been found The popularity is also very good here, how no one to me? About their Zaiding Or nobody Jimmy? I Mt. Ariadne want to have friends You did not look carefully at the code, but I ask a simple question, and STL is not to install any development kits ah. Cout<<vStr.at (0) "<endl; Cout<<*vStr.begin () "<endl; These two areas are the same value, there is nothing wrong with this, but it may be a temporary procedure to preserve their value indicator variables, you print out the values of those variables may be temporary guideline addresses. PS : everyone has to work, busy :) Huntglede reply to the message, 4th Floor Installed themselves with the GCC. . . STL are a standard part of any sub-standard compiler must be provided, but may be different from the bottom of the achievement. I see inside the Notes VC7.1 /[code]* * Copyright (c) 1992-2002 by PJ Plauger. ALL RIGHTS RESERVED. * Consult your license regarding permissions and restrictions. V3.13:0009 */[/code] PJ Plauger generation cattle people die :) [ Closed window ]