How to pass std::vector<void> as std::vector<mystruct> to a function

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Hi,

How to pass std::vector<void*> * as std::vector<MyStruct*>* to a function?

The function declaration is void SetDataReferences(std::vector<MyStruct*>* pVector);

if I pass std::vector<void*> * as std::vector<MyStruct*>* I am getting below error

error C2664: 'SetDataReferences' : cannot convert parameter 2 from 'std::vector<_Ty> *' to 'std::vector<_Ty> *'

How to resolve this?

What I have tried:

I dont know what is the alternative for it.

Posted 24-Sep-18 1:01am

steffi123

Updated 24-Sep-18 1:51am

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2 solutions

Solution 2

The alternative is very clear: creating and passing the parameter in the right type.

You should take this warning very serious because it screams for a coding flaw.

C++

//TODO: Change the creation code of input parameter

Posted 24-Sep-18 1:51am

KarstenK

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CPallini · Accepted Answer · 2018-09-24T01:38:00

Provided you are sure the vector you are passing actually contains pointer to valid MyStruct instances, a reinterpret_cast[^] would do the trick. Try, for instance:

C++

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

struct Foo
{
  string s;
  int i;
};


void reportFooVector( vector <Foo*> * pvf )
{
  for (auto p : *pvf)
    cout << p->s << ", " << p->i << endl;
}


int main()
{
  Foo foo{ "foo",  5};
  Foo goo{ "goo", 10};

  vector <void *> vf { &foo, & goo};

  reportFooVector( reinterpret_cast< vector < Foo * > * >(&vf));
}

How to pass std::vector<void*> * as std::vector<mystruct*>* to a function