c++ - unordered_map iterator iterates to null pointer, defying possibility -

i storing bunch of dummy objects in unordered_map, , iterating through delete them. somehow, comes out key value pairing value null pointer, though i'm pretty sure not possible.

each of objects make houses part of large string construct randomly. make sure hand constructor of object @ least 5 characters of string.

here code:

delete function

bool delete_objects(){     serial.println("deleting objects in 'store'");     for(auto iter = store.begin(); iter != store.end(); iter++)     {         serial.println("\ndeleting following element: \n");         serial.print("key: ");         serial.println(iter->first);         delay(1000);         serial.print("value: ");         serial.println(iter->second->showmewhatyougot());         delay(1000);          delete iter->second;         iter->second = nullptr;         store.erase(iter);     }       if(store.empty())        return true;     else        return false; } 

block objects allocated (delete_objects() called right before this)

unsigned int index = 0; unsigned int key = 0; while(index < buff_string.length()){     int amount = (rand() % 51) + 5;     dummyclass* dc = new dummyclass(buff_string.substr(index, amount));     store[key] = dc;     index += amount;     key++;     serial.println("created new dummyclass object");     serial.print("free memory: ");     serial.println(system.freememory()); } 

class definition

using namespace std;  class dummyclass {     private:         char* _container;      public:         dummyclass(){         }          dummyclass(string input){             _container = new char[input.length()];             strcpy(_container, input.c_str());         }          ~dummyclass(){             delete _container;             _container = nullptr;         }          char* showmewhatyougot(){             return _container;         } }; 

serial output, sos's (crashes, particle chip) when key 0

key: 194 value: q->@b{s?tx/min3k?[~2[mvtoskpe34#5[@q8*d8bzwh`

deleting following element:

key: 193 value: 9hb^7-j(#z3h#0uqg

deleting following element:

key: 192 value: v$xz>c$u{mjxzxl?{kqqvqp*mn3~ce&yzbmop1$9xlkjm)jgja~p{my

deleting following element:

key: 191 value: yo*cvze~2

deleting following element:

key: 190 value: [&pqaktv3{^aq?(ffv/*24xaxej]~t1^sfwim3atpk#{coq

deleting following element:

key: 0 value

c++ string iterator unordered-map

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asked oct 15 '15 @ 2:50 bgenchel 172114