Instruction.h

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#pragma once

#include <assert.h>
#include <iostream>
#include <variant>

#include "VMSRuntimeError.h"
#include "Ops.h"
#include "VMStatus.h"
 
struct Instruction { 
public:

    // the function type we use takes a virtual machine state and returns a status
    void* f;
    int arg;
    
    // constructors to make this a little easier to deal with
    Instruction(void* _f=nullptr, int a=0x0) : f(_f), arg(a) {  
        assert(f != nullptr); // we just can't even store null f, and we'll get an error on construction.
    }       
};

std::ostream& operator<<(std::ostream& stream, Instruction& i) {
    stream << "[INSTR " << i.f << "]";
    return stream;
}