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c++classopencvclass-constructors

C++ classes, help needed

I am new to C++ and trying to understand a code related to OpenCV. It has a class as follow:

class Settings
{
public:
    Settings() : goodInput(false) {}
    enum Pattern { NOT_EXISTING, CHESSBOARD, CIRCLES_GRID, ASYMMETRIC_CIRCLES_GRID };
    enum InputType { INVALID, CAMERA, VIDEO_FILE, IMAGE_LIST };
.
.
.
.
}

what does Settings() : goodInput(false) {} means here. I don't think it is a constructor. Explain this please.

Solution

  • It is indeed a constructor. What you see after : is called initializer-list and it initializes values before entering the curly brackets.

    You should also know that member variables of a class are always initialized before entering the constructor body. If you don't mention a member variable in the initializer list, it will be default initialized.