Understanding Code/Class definition

[remusac]

Hi, I'm trying to understand how the following declaration works.
First class name1::name2{}, how do I interpret that. Second the first public member is just a function HAL() with no type definition.third there is a ":" after HAL() which makes me think inheritance. Fourth there are some more public declarations name1::type some_ptr. All this looks very different then the standard C++ class declaration I'm used from my college book. Could somebody please walk me through this code and explain what each line does and how are the members,variables and functions related.

class AP_HAL::HAL {
public:
    HAL(AP_HAL::UARTDriver* _uartA,
        AP_HAL::UARTDriver* _uartB,
        AP_HAL::UARTDriver* _uartC,)
        :
        uartA(_uartA),
        uartB(_uartB),
        uartC(_uartC),
    {
    //nothing here
    }

    virtual void init(int argc, char * const argv[]) const = 0;

    AP_HAL::UARTDriver* uartA;
    AP_HAL::UARTDriver* uartB;
    AP_HAL::UARTDriver* uartC;

};

[MiiNiPaa]

class name1::name2{}, how do I interpret that

It is a qualified name of class. It either in namespace AP_HAL or a subclass of class AP_HAL

the first public member is just a function HAL() with no type definition

It is a constructor
http://www.learncpp.com/cpp-tutorial/85-constructors/

there is a ":" after HAL() which makes me think inheritance

It is a constructor initializer list
http://www.learncpp.com/cpp-tutorial/101-constructor-initialization-lists/

there are some more public declarations name1::type some_ptr

They are defined in AP_HAL namespace or class

All this looks very different then the standard C++ class declaration I'm used from my college book

All of these features are pretty old.