What else can i use bc F_OK is throwing an error sayinf identidier is undefined

Question

What else can i use bc F_OK is throwing an error sayinf identidier is undefined and i cant figure it out. on visual studios 2017 windows com. already have io.h header, but unistd.h wont work says its for unix.? hope that question is phrased correctly

is there a different way to state that the file doesnt exist in the if statment or remove it all together so that it will still return false with a different staement

bool DoesUserExist(std::string username)
{
std::string user_file_name = GetUserFile(username);

if (access(user_file_name.c_str(), F_OK) != -1)
{
  return true;
}
else
{
  return false;
}
}

Explanation / Answer

F_OK is nothing but an integer variable const with a value of 0. If you don't want to use that, you can just define your own const with value 0 and use that.

as

const int MY_OK = 0;
Now use MY_OK instead of F_OK anywhere... You don't need to use unistd header file in this case.

Your function will become as:

const int MY_OK = 0;

bool DoesUserExist(std::string username)

{

std::string user_file_name = GetUserFile(username);

if (access(user_file_name.c_str(), MY_OK) != -1)

{

return true;

}

else

{

return false;

}

}

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