C++ - std::map with an enum as key

Question

I'm currently trying to create an std::map to store the state of each key of the keyboard. I've created the following map to do it :

static std::map<enum MouseCode, enum InputState> mousePressedMap;

No problem here.

To register the states, I've created a function called by my main class :

    void Input::ReadUserInput(enum Input::MouseCode mouseCode, enum Input::InputState inputState) {
    mousePressedMap[mouseCode] = inputState;
}

And here I'm getting my problem : I got an error on the "[" of the mousePressedMap saying : no "[]" operator corresponds to those operands. And I cannot either do :

    void Input::ReadUserInput(enum Input::MouseCode mouseCode, enum Input::InputState inputState) {
    mousePressedMap[MouseCode::LeftButton] = InputState::DOWN;
}

I got the same error.

Besides, I think the error doesn't come from my enumerations :

        /// <summary>
    /// <para>Enumeration to set parameters to the mouse buttons handling function. The mouse code defines which button has been called.</para>
    /// </summary>
    enum MouseCode {
        LeftButton = 0,
        MiddleButton = 1,
        RightButton = 2
    };
    /// <summary>
    /// <para>Enumeration to set parameters to the mouse buttons handling function. The input state is the current state of the button</para>
    /// </summary>
    enum InputState {
        /// <summary>
        /// Just pressed.
        /// </summary>
        DOWN,
        /// <summary>
        /// Just released.
        /// </summary>
        UP,
        /// <summary>
        /// Was already pressed the last frame.
        /// </summary>
        PRESSED,
        /// <summary>
        /// Is not currently activated and wasn't the last frame.
        /// </summary>
        INACTIVE
    };

Can someone explain me why? I come from C# and Java languages where this syntax was perfectly working and it's quite strange that is not the case here.

Thanks for your help!

EDIT 1 : The error message is (in French, sorry...): Erreur C2679 '[' binaire : aucun opérateur trouvé qui accepte un opérande de partie droite de type 'InputsManagement::Input::MouseCode' (ou il n'existe pas de conversion acceptable) Win7 DirectX c:\\users\\maxime\\desktop\\directx tests\\win7 directx\\win7 directx\\input.cpp 16

Answer 1

So, the purpose of the code is to map the values 0, 1, and 2 into other values? Use an array, indexed by the MouseCode values.