std::string deallocation seems to fail when exiting the function

Question

I'm quite new to programming and it seems that one of the functions give me this error as soon as it runs over this line of code :

std::string name;

Right after I return *this, it goes through deallocating all of the std::vector that are inside the function, and also those associated with some of the named structures that I use. The 'name' variable itself is stored in another std::vector which is member of the class.

Does this mean that the string is written once and everything that should look like it will all point to the same reference ? Or maybe it is something else, but running the debugger line by line clearly fails on this line. Any help would be appreciated !

NOTE - I have deleted all of the previous code to show a simpler exemple of what I had as trouble :

#include <iostream>
#include <fstream>
using namespace std;

int main () {
    string a = "something";
    ofstream output; output.open("a.dat", ios::out|ios::binary);
    output.write((char*)&a, sizeof(a)); output.close();
    
    ifstream input; input.open("a.dat", ios::in);
    string b; 
    input.seekg(0);
    input.read((char*)&b, sizeof(b)); input.close();
    return 0;
}

So if you run this block of code once, and right before running it a second time you remove the three first lines about the output, you have the error I was facing.