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Home/ Questions/Q 6615847
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Editorial Team
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Editorial Team
Asked: May 25, 20262026-05-25T20:30:45+00:00 2026-05-25T20:30:45+00:00

I am having trouble inserting data into this map. I honestly can not figure

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I am having trouble inserting data into this map. I honestly can not figure out the way to do this, but the last line of the code I gave is the part that I need fixed.

map<string, vector<vector<Obj*>* >* > the_map;
vector<vector<Obj*> *>*  vectors = new vector<vector<Obj*> *>;
vector<Obj*> Obj_vector;
vectors->push_back(&Obj_vector);                                                    
the_map.insert(make_pair(string("field1", &vectors)); //error on this line only
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  1. Editorial Team
    Editorial Team
    2026-05-25T20:30:46+00:00Added an answer on May 25, 2026 at 8:30 pm

    Try this:

     the_map.insert(make_pair(string("field1"),  vectors)); 
                           //you forgot this ^  ^
                           //                   |
                           //                   & is not needed here 
    

    By the way, I suspect the usage of so many pointers in your code, and especially these two lines:

    vector<Obj*> Obj_vector;  //this is local variable
    vectors->push_back(&Obj_vector); //inserting address of the local variable
    

    Inserting address of a local variable into vector?

    Beware that the local variable wouldn’t exist after it goes out of scope, which in turn, means that the address which you just inserted into the vector, points to the destroyed object, and using it would invoke undefined behaviour.

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