problem with constructor

[zareie.ehsan]

I wanna take a  4 digit integer value as an input an make an BCD equivalent, I tried this code but it has \error at red line

error: 'decimal' : no appropriate default constructor available

 

it mean the class constructor? is the constructor of  class decimal wrong? plz help me

 

class decimal

{

public:

sc_int<4> dec0;

sc_int<4> dec1;

sc_int<4> dec2;

sc_int<4> dec3;

 

///constructor

decimal(sc_int<4> d0,sc_int<4> d1,sc_int<4> d2,sc_int<4> d3)

   {

       dec3=d3;

       dec2=d2;

       dec1=d1;

       dec0=d0;

   }

}

 

SC_MODULE (seprate_digit)

{

    sc_in <sc_int<16>> in;

    sc_in <bool> clk;

    sc_out <decimal> d;

    decimal dtmp;

 

    SC_CTOR (seprate_digit)

    {

         SC_METHOD(process3);

         sensitive << clk.pos();

    }

   void process3()

   {

      /////

   }

};

 

[Philipp A Hartmann]

As the error says (emphasis mine)

 

error: 'decimal' : no appropriate default constructor available

 

you need a default constructor (a constructor without arguments) in your case.

 

In the module, you create an instance of 'decimal' without explicitly initializing it in the constructor of 'seprate_digit'.  Theoretically, you could use an initializer list:

SC_CTOR (seprate_digit)
  : in("in"), clk("clk"), d("d") // port names -> recommended practice 
  , decimal(0,0,0,0)             // <-- explicitly initialize decimal member

Since you use 'decimal' as a signal type, you'll definitely need a default constructor.  This could look like the following

decimal()
/*  : dec0(), dec1(), dec2(), dec3() */ // optional, as sc_int has an explicit default constructor
{}

Secondly, you'll need to define more helper functions to use sc_signal with your own data types, see http://www.doulos.com/knowhow/systemc/faq/#q1

 

Greetings from Oldenburg,
  Philipp

NB: Why do you post the question three times in 10 minutes? ;-)

[dakupoto]

Greetings from Oldenburg,

  Philipp

NB: Why do you post the question three times in 10 minutes? ;-)

 

The poster has most probably woken up in the morning to

realize that his important class project is due that evening.

[zareie.ehsan]

thank you very much 

 

As the error says (emphasis mine)

 

 

you need a default constructor (a constructor without arguments) in your case.

 

In the module, you create an instance of 'decimal' without explicitly initializing it in the constructor of 'seprate_digit'.  Theoretically, you could use an initializer list:

SC_CTOR (seprate_digit)
  : in("in"), clk("clk"), d("d") // port names -> recommended practice 
  , decimal(0,0,0,0)             // <-- explicitly initialize decimal member

Since you use 'decimal' as a signal type, you'll definitely need a default constructor.  This could look like the following

decimal()
/*  : dec0(), dec1(), dec2(), dec3() */ // optional, as sc_int has an explicit default constructor
{}

Secondly, you'll need to define more helper functions to use sc_signal with your own data types, see http://www.doulos.com/knowhow/systemc/faq/#q1

 

Greetings from Oldenburg,
  Philipp

NB: Why do you post the question three times in 10 minutes? ;-)

thank you very much for your help full guide.

sorry, I thought my post was not successfully posted, so I posted my question many times :-)