source: examples/wrapper/src/pointer.h @ ecf6b46

#pragma once

#include <fstream.hfa>
#include <stddef.h>
#include <stdlib.hfa>

//==============================================================================
// type safe malloc / free

forall(otype T)
T* new()
{
        T* p = malloc();
        p{};
        return p;
}

forall(otype T)
void delete(T* p)
{
        ^p{};
        free(p);
}

//==============================================================================
// ref counter content

struct content_t
{
        int value;
        size_t count;
};

void ?{}(content_t* this)
{
        sout | "Constructing content";
        this->count = 0;
}

void ^?{}(content_t* this)
{
        sout | "Destroying content";
}

//==============================================================================
// ref counter wrapper

struct wrapper_t
{
        content_t* ptr;
};

void ?{}(wrapper_t* this)
{
        sout | "Constructing empty ref pointer" | nl;
        this->ptr = NULL;
}

void ?{}(wrapper_t* this, wrapper_t rhs)
{
        sout | "Constructing ref pointer from copy";
        this->ptr = rhs.ptr;
        this->ptr->count++;
        sout | "Reference is " | this->ptr->count | nl;
}

void ^?{}(wrapper_t* this)
{
        if(this->ptr)
        {
                sout | "Destroying ref pointer";
                this->ptr->count--;
                sout | "Reference is " | this->ptr->count | nl;
                if(!this->ptr->count) delete(this->ptr);
        }
        else
        {
                sout | "Destroying empty ref pointer" | nl;
        }
}

wrapper_t ?=?(wrapper_t* this, wrapper_t rhs)
{
        sout | "Setting ref pointer";
        if(this->ptr)
        {
                this->ptr->count--;
                sout | "Reference is " | this->ptr->count | nl;
                if(!this->ptr->count) delete(this->ptr);
        }
        this->ptr = rhs.ptr;
        this->ptr->count++;
        sout | "Reference is " | this->ptr->count | nl;
}

void set(wrapper_t* this, content_t* c)
{
        this->ptr = c;
        this->ptr->count++;
        sout | "Setting ref pointer";
        sout | "Reference is " | this->ptr->count | nl;
}

void clear(wrapper_t* this)
{
        sout | "Clearing ref pointer";
        this->ptr->count--;
        sout | "Reference is " | this->ptr->count | nl;
        if(!this->ptr->count) delete(this->ptr);
        this->ptr = NULL;
}


wrapper_t wrap(int val)
{
        wrapper_t w;
        content_t* c = malloc();
        c{};
        c->value = val;
        set(&w, c);
        return w;
}