Accessing data of another class whose object was sent as parameter in constructor

Question

I'm working on creating a simulator for RISC.

Below are a different part of codes relevant to my question.

main.cpp

memory* main_memory; processor* cpu; main_memory = new memory (verbose); //memory classs implemented correctly cpu = new processor (main_memory, verbose); interpret_commands(main_memory, cpu);// takes to commands class

In processor.cpp, I have to access a function of memory class that is public.

memory.cpp:

 uint32_t memory::read_word (uint32_t address) { // some calculation and returns a hex word at address }

processor.cpp:

#include "memory.h" void processor::execute(unsigned int num, bool breakpoint_check){ if(some condition){ //call read_word at address } }

I do have a parameterized constructor in processor.cpp that has memory class pointer:

processor::processor(memory* main_memory, bool verbose){ }

The question is, how can I call read_word function(of class memory) from the execute function (of class processor)?
Any help would be highly appreciated :)

Here's the thing about bugs. If you don't know what they are, how do you know what is the relevant code? Heck, what is the relevant problem? — user4581301
– user4581301, Commented Jun 16, 2019 at 2:05
Side note: you probably don't need any dynamic allocations, and if you do, avoid new. Use a smart pointer. — user4581301
– user4581301, Commented Jun 16, 2019 at 2:09
lol @JohnZwinck. Sorry have been working on simulator whole night :) Updated it now. — Rick Williams
– Rick Williams, Commented Jun 16, 2019 at 2:10
@user4581301, I updated the question. I need to access read_word() from execute (). — Rick Williams
– Rick Williams, Commented Jun 16, 2019 at 2:11

John Zwinck · Accepted Answer · 2019-06-16 03:05:13Z

1

You just need to store the main_memory* in the constructor as a member variable, so you can use it later in another member function:

processor::processor(memory* main_memory, bool verbose) : _main_memory(main_memory) {} void processor::execute(unsigned int num, bool breakpoint_check){ if(some condition){ _main_memory->read_word(...); } }

And add memory* _main_memory = nullptr inside class processor.

edited Jun 16, 2019 at 3:05

answered Jun 16, 2019 at 2:12

John Zwinck

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4 Comments

Rick Williams Over a year ago

What's my_address here? Is it like address of current instruction as in pc? Cause the constructor is not getting any address argument.

Rick Williams Over a year ago

What's the _main_memory(main_memory)?

John Zwinck Over a year ago

_main_memory(main_memory) is an initialization list. It's the usual way to initialize member variables, though if you prefer you can just say _main_memory = main_memory; inside the constructor body.

Rick Williams Over a year ago

Oh, I got it. It was supposed to be memory* _main_memory= nullptr in the class processor.

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