Using this with array of pointer in class constructor c-CodePudding

I tried to assign an array of pointer to nullptr.

class ToyBox
{
private:
  Toy *toyBox[5];
  int numberOfItems;

public:
  ToyBox()
  {
    this->numberOfItems = 0;
    this->toyBox = {}
  }
}

An error throw at this in this->toyBox:

expression must be a modifiable lvalueC/C (137)

Any suggestion to corrected?

CodePudding user response：

You can only Initialize arrays in that way: Assign a single value to array. But in the constructor you could/must use Member Initialize List:

class ToyBox
{
private:
  Toy *toyBox[5];
  int numberOfItems;

public:
  ToyBox() :
     toyBox{nullptr}
     , numberOfItems(0)
  {
  }
};

With C , It's better to use std::array instead of raw C-Array: _{related: CppCoreGuidlines: ES.27}

class ToyBox
{
private:
  std::array<Toy*, 5> toyBox;
  int numberOfItems;

public:
  ToyBox() :
     toyBox({nullptr})
     , numberOfItems(0)
  {
  }
};

Or (I think) better:

  ToyBox() : numberOfItems(0)
  {
    std::fill(toyBox.begin(), toyBox.end(), nullptr);
  }