Why won't this list remove_if code compile

[Angus]

Hi

I have a class CRequest with a function:
bool IsFinished() const;

I have a list of these CRequests - list<CRequestmylist.

I create a function object to find if a CRequest is finished:
class is_finished : public std::unary_function<CRequest, bool>
{
public:
bool operator() (CRequest req) { return req.IsFinished(); }
};

And I use remove_if like this:
m_RequestList.remove_if(is_finished());

But I get a compile error:
error C2664: 'remove_if' : cannot convert parameter 1 from 'class
is_finished' to 'class std::binder2nd<struct std::not_equal_to<class
CRequest'
No constructor could take the source type, or constructor overload
resolution was ambiguous

How can I fix this?

[Pete Becker]

On 2008-05-24 11:05:20 -0400, "Angus" <no****@gmail.comsaid:

>
I have a class CRequest with a function:
bool IsFinished() const;

I have a list of these CRequests - list<CRequestmylist.

I create a function object to find if a CRequest is finished:
class is_finished : public std::unary_function<CRequest, bool>
{
public:
bool operator() (CRequest req) { return req.IsFinished(); }
};

And I use remove_if like this:
m_RequestList.remove_if(is_finished());

But I get a compile error:
error C2664: 'remove_if' : cannot convert parameter 1 from 'class
is_finished' to 'class std::binder2nd<struct std::not_equal_to<class
CRequest'
No constructor could take the source type, or constructor overload
resolution was ambiguous

How can I fix this?

Get a newer compiler.

--
Pete
Roundhouse Consulting, Ltd. (www.versatilecoding.com) Author of "The
Standard C++ Library Extensions: a Tutorial and Reference
(www.petebecker.com/tr1book)

[Frank Birbacher]

Hi!

Angus schrieb:

public:
bool operator() (CRequest req) { return req.IsFinished(); }

I guess the operator should be a const function.

Frank

[Daniel T.]

"Angus" <no****@gmail.comwrote:

I have a class CRequest with a function:
bool IsFinished() const;

I have a list of these CRequests - list<CRequestmylist.

I create a function object to find if a CRequest is finished:
class is_finished : public std::unary_function<CRequest, bool>
{
public:
bool operator() (CRequest req) { return req.IsFinished(); }
};

And I use remove_if like this:
m_RequestList.remove_if(is_finished());

But I get a compile error:
error C2664: 'remove_if' : cannot convert parameter 1 from 'class
is_finished' to 'class std::binder2nd<struct std::not_equal_to<class
CRequest'
No constructor could take the source type, or constructor overload
resolution was ambiguous

How can I fix this?

Try this:

class CRequest
{
public:
bool isFinished() const;
};

void fn( list<CRequestlst )
{
lst.remove_if( mem_fun_ref( &CRequest::isFinished ) );
}