Question: That is the point. How to write and read binary files with std::vector inside them?

I was thinking something like:

```
//============ WRITING A VECTOR INTO A FILE ================
const int DIM = 6;
int array[DIM] = {1,2,3,4,5,6};
std::vector<int> myVector(array, array + DIM);
ofstream FILE(Path, ios::out | ofstream::binary);
FILE.write(reinterpret_cast<const char *>(&myVector), sizeof(vector) * 6);
//===========================================================

```

But I don't know how to read this vector. Because I thought that the following was correctly but it isn't:

```
ifstream FILE(Path, ios::in | ifstream::binary);
FILE.read(reinterpret_cast<const char *>(&myVector), sizeof(vector) * 6);

```

So, how to perform the operation?

Answer: 
Use `boost::serialization`.

If you don't want use `boost` - write size and `vector`.

```
size_t sz = myVector.size();
FILE.write(reinterpret_cast<const char*>(&sz), sizeof(sz));
FILE.write(reinterpret_cast<const char*>(&myVector[0]), sz * sizeof(myVector[0]));

```
Before reading `vector`, you should resize it: `yourVector.size(numberOfElementsYouRead)`.

Besides, `sizeof(vector<your_type>)` is just the size of the `vector` object internal implementation; vector element size is `sizeof(std::vector<your_type>::value_type)`.

Then read it like this:

```
file.read(reinterpret_cast<char *>(&myVector[0]), sizeof(vector<int>::element_type) * element_count); 

```