How to reference pointer array to several const array

Question

I have three set of array with different data

const UINT16 array1[4] = {1,2,3,4};   

const UINT16 array2[4] = {3,2,2,4};

const UINT16 array3[4] = {8,7,2,4};   //This is not PIN code, :-)

...

void example(void)
{

    UINT16 * pp;

    UINT16 data;

    pp = array1;

    data = pp[0];

    pp = array2;

    data = pp[3];

    pp = array3;

    data = pp[2];

    //and rest of code, this is snipped version of my larger code

}

in dspIC33, I get "warning: assignment discards qualifiers from pointer target type"

Based on impression from google search, I might do this way....

void example(void)
{

    const UINT16 * pp;

    pp = array1;

    pp = array2;

    pp = array3;

    //and rest of code, this is snipped version of my larger code

}

then would that make pp variable that store address data a fixed value? (ie in ROM memory)?

What the right way?, I perfer to keep data in const memory if possible?

Lohrun · Accepted Answer · 2013-10-21 12:26:00Z

2

You are wrong in your analysis, pp is not const but the value pointed by pp is const (that is *pp is const).

const UINT16 * pp; // means pp is a pointer to a const UINT16 value

If you want pp to be const as the address pointed is const you have to write:

UINT16 * const pp; // means pp is a const pointer to a UINT16 value

If you want to have both constness of pointer and pointed value, you have to write:

const UINT16 * const pp; // means pp is a const pointer to a const UINT16 value.

answered Oct 21, 2013 at 12:26

Lohrun

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