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redtaza@hotmail.com · Guest

Can somebody tell me what is wrong with the following code, it gives a
compile time error saying that A::Insert(int) is expected to be a
function. I am calling in from B::Insert() using a non-const iterator,
and as far as I can make out the calling object is not const. (The
compiler options and details are below the code.)

Many thanks in advance.

<-------------------------------------------------------------------->
#include <set>

using namespace std;

class A
{
public:
A( int x ) : x_( x ) {}

bool operator<( const A& rhs ) const { return this->x_ < rhs.x_; }

void Insert( int y ) { y_.insert( y ); }

private:
int x_;
set< int > y_;
};

class B
{
public:
B()
{
a_.insert( A( 1 ));
a_.insert( A( 2 ));
}

void Insert()
{
A a( 2 );

set< A >::iterator i = a_.find( a );
if( i != a_.end())
i->Insert( 2 );
}

private:
set< A > a_;
};

namespace { B b; }

int
main()
{
::b.Insert();
}
<-------------------------------------------------------------------->

/home/scratch $ /usr/bin/g++34 -ansi -pedantic -Wall main.cpp
main.cpp: In member function `void B::Insert()':
main.cpp:34: error: no matching function for call to `A::Insert(int)
const'
main.cpp:12: note: candidates are: void A::Insert(int) <near match>
/home/scratch $
/home/scratch $ /usr/bin/g++34 -v
Reading specs from /usr/lib/gcc/i386-redhat-linux/3.4.0/specs
Configured with: ../configure --prefix=/usr --mandir=/usr/share/man
--infodir=/usr/share/info --enable-shared --enable-threads=posix
--disable-checking --with-system-zlib --enable-__cxa_atexit
--disable-libunwind-exceptions --enable-languages=c,c++,objc,java,f77
--host=i386-redhat-linux
Thread model: posix
gcc version 3.4.0 (Red Hat Linux 3.4.0-1)

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Ulrich Eckhardt · Guest

[email]redtaza (AT) hotmail (DOT) com[/email] wrote:

L.Suresh · Guest

Once you put the key in the set, you are not supposed to modify it in
place because it may affect the order of the container. The iterator
you got points to const key. Hence you cannot call a non-const function
Insert on it.

Change the offending line to:
const_cast<A&>(*i).Insert(2);

Or, make the set<int> y_ mutable, and make the Insert member function
of A a const.

--lsu

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Ulrich Eckhardt · Guest

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