c++ - Custom string class and destructors? -

i bored today , want create own little string class. 'system.string' class in .net it's split/replace/remove etc. functions , want attempt implement them.

my problem destructor. if have multiple instances of string class hold same string, of them try , delete[] same memory when destructor called??

for example:

void dosomething() {     mystringclass text = "hello!";     {         mystringclass text2 = text;         // text2     } // text2 destroyed, char* string in memory     // text points useless memory?? } 

am understanding right? lol.

thanks,

alex

edit:

oops, forgot include code:

class string {     unsigned int length;     char* text;  public:      string() : length(0), text(null) { }      string(const char* str) {         if (!str) throw;         length = strlen(str);         text = new char[length];         memcpy(text, str, length);     }      ~string() {         delete[] text;     } }; 

you correct -- both attempt delete [] same memory block.

you did not define copy constructor class, default one, performs shallow copy of pointer.

when text2 falls out of scope, pointer delete []d. when text1 falls out of scope, same pointer delete []d again, resulting in undefined behavior.

there number of ways around this, simplest being define copy constructor , assignment operator.