Line data    Source code

       1              : // This file (ptr_address.cc) was created by Ron Rechenmacher <ron@fnal.gov> on
       2              : // Feb 28, 2019. "TERMS AND CONDITIONS" governing this file are in the README
       3              : // or COPYING file. If you do not have such a file, one can be obtained by
       4              : // contacting Ron or Fermi Lab in Batavia IL, 60510, phone: 630-840-3000.
       5              : // $RCSfile: .emacs.gnu,v $
       6              : // rev="$Revision: 1784 $$Date: 2026-10-09 13:51:46 -0500 (Fri, 09 Oct 2026) $";
       7              : #if 0
       8              : rm -f /tmp/trace_buffer_`whoami`
       9              : 
      10              : /home/ron/work/tracePrj/trace
      11              : ron@mu2edaq01 :^) treset; ptr_address_string
      12              : 02-28 16:42:54.035092 ptr_address_string nfo TRACE_NAME is ptr_address_string
      13              : 02-28 16:42:54.035184 ptr_address_string nfo the real message is hello
      14              : 02-28 16:42:54.035190 ptr_address_string nfo the copy message is hello
      15              : 02-28 16:42:54.035197 ptr_address_string nfo the address of message string - (void*)real_msg=0x40872e
      16              : 02-28 16:42:54.035202 ptr_address_string nfo ip=0xc4ac20
      17              : 02-28 16:42:54.035207 ptr_address_string nfo ullp=0xc4acb0 *ullp=555
      18              : 02-28 16:42:54.035211 ptr_address_string nfo std::string("hello")=hello
      19              : 02-28 16:42:54.035215 ptr_address_string nfo unique_ptr up_string=0xc4acd0 which is ptr to std::string (not the actual string within)
      20              : 02-28 16:42:54.035219 ptr_address_string nfo unique_ptr *up_string=new string
      21              : 02-28 16:42:54.035223 ptr_address_string nfo unique_ptr (*up_string).c_str()=new string
      22              : 02-28 16:42:54.035227 ptr_address_string nfo unique_ptr (void*)((*up_string).c_str())=0xc4ace0
      23              : 02-28 16:42:54.035230 ptr_address_string nfo unique_ptr &(*up_string)[0]=new string
      24              : 02-28 16:42:54.035234 ptr_address_string nfo unique_ptr (void*)&(*up_string)[0]=0xc4ace0
      25              : 02-28 16:42:54.035244 ptr_address_string nfo unique_ptr &(*up_vector_int)[0]=0xc4ad20
      26              : 02-28 16:42:54.035249 ptr_address_string nfo unique_ptr (*up_vector_int)[0]=1
      27              : --2019-02-28_16:42:54--
      28              : #endif
      29              : 
      30              : #include "TRACE/trace.h"  // TRACE
      31              : 
      32              : #include <stdio.h>   // printf
      33              : #include <stdlib.h>  // malloc
      34              : #include <string.h>  // rindex
      35              : #include <memory>    // std::unique_ptr
      36              : #include <vector>    // std::vector
      37              : 
      38              : #if __cplusplus >= 201103L
      39              : #       define TRACE_NAME                                    \
      40              :                 [](const char *path) {                            \
      41              :                         const char *bp= rindex(path, '/');            \
      42              :                         std::string ss((bp != NULL) ? bp + 1 : path); \
      43              :                         size_t lastindex= ss.find_last_of(".");       \
      44              :                         return ss.substr(0, lastindex);               \
      45              :                 }(__BASE_FILE__)                                  \
      46              :                         .c_str()
      47              : #else
      48              : #       define TRACE_NAME "ptr_address_string"
      49              : #endif
      50              : 
      51            0 : int main()
      52              : {
      53            0 :         const char *real_msg= "hello";
      54            0 :         int *ip= (int *)malloc(sizeof(int));
      55            0 :         char *cp= (char *)malloc(100);
      56            0 :         strncpy(cp, real_msg, 99);
      57            0 :         cp[99]= '\0';
      58            0 :         unsigned long long *ullp= (unsigned long long *)malloc(sizeof(unsigned long long));
      59            0 :         *ullp= 555;
      60              : 
      61            0 :         TLOG(TLVL_INFO) << "TRACE_NAME is " << TRACE_NAME;
      62            0 :         TLOG(TLVL_INFO) << "the real message is " << real_msg;
      63            0 :         TLOG(TLVL_INFO) << "the copy message is " << cp;
      64            0 :         TLOG(TLVL_INFO) << "the address of message string - (void*)real_msg=" << (void *)real_msg;
      65            0 :         TLOG(TLVL_INFO) << "ip=" << ip;
      66            0 :         TLOG(TLVL_INFO) << "ullp=" << ullp << " *ullp=" << *ullp;
      67            0 :         TLOG(TLVL_INFO) << "std::string(\"hello\")=" << std::string("hello");
      68              : #if __cplusplus >= 201103L
      69            0 :         std::unique_ptr<std::string> up_string{new std::string("new string")};
      70            0 :         std::unique_ptr<std::vector<int>> up_vector_int{new std::vector<int>{1, 2, 3}};
      71            0 :         TLOG(TLVL_INFO) << "unique_ptr up_string=" << up_string << " which is ptr to std::string (not the actual string within)";
      72            0 :         TLOG(TLVL_INFO) << "unique_ptr *up_string=" << *up_string;
      73            0 :         TLOG(TLVL_INFO) << "unique_ptr (*up_string).c_str()=" << (*up_string).c_str();
      74            0 :         TLOG(TLVL_INFO) << "unique_ptr (void*)((*up_string).c_str())=" << (void *)((*up_string).c_str());
      75            0 :         TLOG(TLVL_INFO) << "unique_ptr &(*up_string)[0]=" << &(*up_string)[0];
      76            0 :         TLOG(TLVL_INFO) << "unique_ptr (void*)&(*up_string)[0]=" << (void *)&(*up_string)[0];
      77            0 :         TLOG(TLVL_INFO) << "unique_ptr &(*up_vector_int)[0]=" << &(*up_vector_int)[0];
      78            0 :         TLOG(TLVL_INFO) << "unique_ptr (*up_vector_int)[0]=" << (*up_vector_int)[0];
      79              : #endif
      80            0 :         return (0);
      81            0 : }  // main