Error creating array of class

Question

I have a class of the following form:

class T
{
   public:
   /// Constructor
   T(const std::string& baseName);
};

Now within the main() method I am trying to create an array of the objects of the class using:

  T* s = new T[20](baseFileName); 

I am not getting where I am making a mistake...can someone please help.

The error which I am getting is:

error: ISO C++ forbids initialization in array new [-fpermissive]

Answer 1

You should first create the array of objects like below:

T* s = new T[20]; //allocating 20 objects

now you can call your desired function by making a little change:

class T
{
   public:
   T(){};//default constructor
   /// Constructor
   SetValue(const std::string& baseName);
};

call the function using a loop:

for( int i=0 ; i<20;i++)
s[i].SetValue(baseString);

Answer 2

The compiler is telling you exactly what's wrong. You can't do this:

T* s = new T[20](baseFileName);

More specifically, you can't have that (baseFileName) bit when you use new. Just add a default constructor to T and fill it in yourself. Maybe add a method to your T class that returns array for you without you having to loop every time you need to construct one.

T * s = new T[20];
for(int i = 0; i < 20; i++) { s[i].setName(baseFileName); }

Or since you already know what the array is going to look like at compile-time:

T s [20] {baseFileName, baseFileName,baseFileName, baseFileName,baseFileName, baseFileName,baseFileName, baseFileName,baseFileName, baseFileName,baseFileName, baseFileName,baseFileName, baseFileName,baseFileName, baseFileName,baseFileName, baseFileName,baseFileName, baseFileName};