c++ - Set new size of dynamic array from an external function/class? -

my main code declares pointer needs resized external function. ex:

double *vect =null; classobj object;  object.func(vect);  //--- print outcome for(int j=0; j<4; ++j)    cout << vect[j] << " .. " << endl;

where function func() part of classobj defined in file (say classobj.h , .cpp) as

void classobj::func(double *_vect){    _vect  = new double[4];    for(int j=0; j<4; ++j)     _vect[j] = 3.0*j +1 ;  };

the problem vect has not been resized. segmentation fault. idea please on how use pointers in case?

you passing reference array , creating new array , assigning pointer in function. need pass pointer of pointer , reassign address of pointer:

void classobj::func(double **_vect){     (*_vect)  = new double[4];

although solution work recommend using std::vector purpose , passing reference function

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