SystemC constructor, class

Question

I am new in systemc. There is one confusion that I am having.

I am creating a sc_module(hello_world). The sc_ctor(hello_world) has nothing between the curly braces and I just have a simple void say_hello() function inside the module which prints "hello world."

In the sc_main, I did this:

hello_world hello; 
hello.say_hello();

However, I am getting an error that error C2228: left of '.say_hello' must have class/struct/union.

I tried this and it worked:

in sc_main, I did this:

hello_world hello("hi "); 
hello.say_hello();

Why it is showing error in the first place? I didn't use one argument constructor.

So, instead of hello_world hello("hi ") shouldn't it be hello_world hello ? I was just trying to compare with C++ class.

Answer 1

It is possible that you defined your constructor as private. As a result compiler cannot name it from main.cpp.

Answer 2

Inbuilt constructor after macro expansion must have an argument.

Answer 3

I can´t see nothing wrong.

In fact, it seems to me, that you have the same code like this example -> http://www.asic-world.com/systemc/first1.html

I hope you could check your with this one.

Answer 4

The macro SC_CTOR has created a hello(const sc_module_name name&) constructor for you. Therefor the compiler will not generate a default constructor for you to call and the object hello cannot be created.

Answer 5

Every SystemC module, whether defined with macro SC_MODULE or inherits sc_module, needs to have a module name. Constructors of SystemC modules must have one parameter of class sc_module_name.

In SystemC standard (IEEE Std 1666-2011)

Every class derived (directly or indirectly) from class sc_module shall have at least one constructor. Every such constructor shall have one and only one parameter of class sc_module_name but may have further parameters of classes other than sc_module_name. That parameter is not required to be the first parameter of the constructor.

If you are using macro SC_CTOR, it is actually a constructor with one sc_module_name parameter!

in sc_module.h:

#define SC_CTOR(user_module_name)                           \
    typedef user_module_name SC_CURRENT_USER_MODULE;        \
    user_module_name( ::sc_core::sc_module_name )