structures and classes

[wysota]

If the structure is tightly related to the class, it can be declared as in your code however it might be better to declare it inside the class.

class readHeader : ... {
public:
  struct headerInfo {
    int numberOfSamples;
    int numberOfLines;
    // ...
  };
 
  headerInfo getHeaderInfo() const { ... }
};

class readHeader : ... {
public:
  struct headerInfo {
    int numberOfSamples;
    int numberOfLines;
    // ...
  };

  headerInfo getHeaderInfo() const { ... }
};

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Note that the fully qualified name of the struct then becomes readHeader::headerInfo.