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const and non const parameter passing

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  const and non const parameter passing asit <lipun4u@gmail.com> - 2011-11-17 02:17 -0800
    Re: const and non const parameter passing Ian Collins <ian-news@hotmail.com> - 2011-11-17 23:24 +1300
    Re: const and non const parameter passing asit <lipun4u@gmail.com> - 2011-11-17 02:20 -0800
    Re: const and non const parameter passing Juha Nieminen <nospam@thanks.invalid> - 2011-11-17 17:09 +0000

#11558 — const and non const parameter passing

why the following code does not compile at line 14

#include <iostream>
#include <cstdlib>

using namespace std;

struct One
{
        void funct1()
        {
                cout<<"Testing..."<<endl;
        }
};

void funct2( const One& c) //line 14
{
        c.funct1();
}

int main()
{
        One b;
        funct2(b);
        return 0;
}

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#11559

On 11/17/11 11:17 PM, asit wrote:
> why the following code does not compile at line 14
>
> #include<iostream>
> #include<cstdlib>
>
> using namespace std;
>
> struct One
> {
>          void funct1()
>          {
>                  cout<<"Testing..."<<endl;
>          }
> };
>
> void funct2( const One&  c) //line 14
> {
>          c.funct1();

It will fail here. funct1() is a non-const member function, c is a const 
object.

-- 
Ian Collins

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#11560

sorry...the error is at line 16

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#11573

asit <lipun4u@gmail.com> wrote:
> using namespace std;

  You wrote 20 characters (and a couple of newlines) in order
to save writing 5 characters (namely "std::") twice. Overall the
size of your program increased by 12 characters and two lines
without any obvious benefit (such as the program becoming easier
to read and understand). Was it really worth it?

> struct One
> {
>        void funct1()
>        {
>                cout<<"Testing..."<<endl;
>        }
> };
> 
> void funct2( const One& c) //line 14
> {
>        c.funct1();
> }

  funct1() must be const if you want to call it using a const
object.

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