const and non const parameter passing

[asit]

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;
}

 

[asit]

sorry...the error is at line 16

 

[Ian Collins]

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.

 

[Juha Nieminen]

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.