no default constructor exists for class x (inheritance) C++

Question

I have the following three headers: IBaseStates.h ``` class IBaseStates { public: enum STATE; virtual void Update( STATE state ) = 0; }; ``` PlayerStates.h ``` #pragma once #include "IBaseStates.h" #include "Player.h" class PlayerStates : public IBaseStates, public Player { public: enum STATE { FLYING, FALLING }; int textureAmount; PlayerStates(); ~PlayerStates( ); void Update( STATE state ); }; ``` Player.h ``` #pragma once #include "StructVertex.h" #include "SquareVertices.h" #include "WICTextureLoader.h" using namespace Microsoft::WRL; using namespace DirectX; //using namespace DirectX; class Player : public SquareVertices { public: Player( ComPtr d3dDevice ); ~Player(); void Initialize(); void Update(); float x; float y; float z; float rotation; float velocity; ComPtr vertexbuffer; ComPtr indexbuffer; ComPtr texture[3]; protected: const ComPtr d3dDevice; }; ``` Why when I define a constructor for m…

Accepted Answer

When you declare a non-default constructor for a class, the compiler does not generate a default one anymore. So you have to provide your own.

`PlayerStates` needs to call a default constructor of its base class `Player` in its own default constructor. So you either need to provide `Player` with a default constructor, or call it's non-default constructor from `PlayerStates`' default constructor initialization list.

This implicitly calls `Player::Player()`.

```
PlayerStates::PlayerStates() : textureAmount( 3 ) {}
```

This calls the single argument constructor:

```
PlayerStates::PlayerStates() : Player(someComPtr), textureAmount( 3 ) {}
```

no default constructor exists for class x (inheritance) C++

Solution

Problem