c++ - Iterating values into a vector while reading in a file using getline

I am trying to create a vector filled with values of the size of each string line of a file of 'blokus tiles' (tiles of periods or stars that are of dimensions 5x5). The file is read in as a vector of vectors of strings,

vector  tile 
vector > alltiles

I am trying iterate values into a vector that stores the sizes of the tile strings (each line). I am doing this to later output an error if each line is not the same length, or each line is an incorrect length, or if there are other characters besides stars (*) or periods (.). I did this to print the size of the tiles in the file blokusstatus.txt (which was entered as a command line argument),

if (infile.is_open()) {

   while (std::getline(infile, tileline)) {   
     int actualtilesize = tileline.length();
     cout << actualtilesize << std::endl;

     tile.push_back(tileline);
     alltiles.push_back(tile); 
   }
  }
  infile.close();


//print out the contents of the file
  std::ofstream outfile;
  outfile.open(arginfile); 
  for (auto e: tile) { 
    cout << e << std::endl; 
  }

Here is the result:

ec327@ec327-VirtualBox:~$ ./w5blokus2 5 blokusstatus.txt
5
5
5
5
5
0
5
5
5

5
5
0
5
5
5
5
5
.....
.*...

**...
*....
*....

.....
.....
**...
*....
**...


.....
.....
*....
***..
*....

This looks good. However, I then try to make the list of numbers into a vector this way:

if (infile.is_open()) {   //infile is open only if 3 or 4 arguments

  int i = 0;
  while (std::getline(infile, tileline)) {
    for (int i=0; i <= tileline.end(); i++) {   
      vector  sizenums;
      sizenums[i] = tileline.length();
      i++;
      cout << sizenums << std::endl;
    }
    //cout << actualtilesize << std::endl;
  }

  tile.push_back(tileline);
  alltiles.push_back(tile); 
}
infile.close();

std::ofstream outfile;
outfile.open(arginfile);  
for (auto e: tile) { 
  cout << e << std::endl; 
}

This gives quite a lengthy error when compiled, including

^~~~~~~~
/usr/include/c++/6/ostream:497:5: note: template argument
/substitution failed:

w5blokus3.cpp:80:15: note: deduced conflicting types for parameter

‘_CharT’ (‘char’ and ‘std::vector’)
cout << sizenums << std::endl;"

w5blokus3.cpp:80:15: note: cannot convert ‘sizenums’ (type
‘std::vector’) to type ‘char’

cout << sizenums << std::endl;

and I'm not sure what is wrong. I'm a newbie, thanks for any help or tips.

Answer

for (int i=0; i <= tileline.end(); i++) {   
   vector  sizenums;
   sizenums[i] = tileline.length();

First, you create a new vector each iteration through the loop. You need to create the vector, then loop or iterate through it.

However, after

vector sizenums;

your vector is empty. Direct access by [] won't work. Use push_back to add elements to the end:

vector  sizenums;
...
for (int i=0; i <= tileline.end(); i++) {  
    sizenums.push_back(tileline.length());

Also:

 for(int i ...
     ...
     i++;

Don't increase your loop variable manually. The for loop handles that already.