where did explicit come from?

[Stephen Alpert]

I've moved an ATL project (that uses STL) from VC6 to VC7. Of course, it won't
compile. In particular, the line

char *res = (char *)malloc( n );
ostrstream pout = ostrstream( res, n ); <<-- error here

now generates an error:

error C2558: class 'std:strstream' : no copy constructor available or copy
constructor is declared 'explicit'

The relevant definition from <strstream> is:
....
_CRTIMP2 ostrstream(char *, streamsize,
ios_base:penmode =
ios_base:ut); // construct with static array


How do I fix this? Do I have to extend ostrstream and add my own constructor?
Am I misreading the error message?

/steveA
Steve Alpert
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[Hendrik Schober]

I've moved an ATL project (that uses STL) from VC6 to VC7. Of course, it won't
compile. In particular, the line

char *res = (char *)malloc( n );
ostrstream pout = ostrstream( res, n ); <<-- error here

Do you really want to do this??
It creates a temporary unnamed 'ostrstream'
object and uses that to initialize 'pout'.

now generates an error:

error C2558: class 'std:strstream' : no copy constructor available or copy
constructor is declared 'explicit'

While the compiler is allowed to eliminate
the temporary, the copy constructor is
required nevertheless.

The relevant definition from <strstream> is:
...
_CRTIMP2 ostrstream(char *, streamsize,
ios_base:penmode =
ios_base:ut); // construct with static array


How do I fix this? Do I have to extend ostrstream and add my own constructor?

Try this:
ostrstream pout( res, n );

Am I misreading the error message?

An 'explicit' is one way that would lead to
this error message. Here, it probably is the
missing copy ctor.

/steveA
Steve Alpert
[...]

Schobi

--
(e-mail address removed) is never read
I'm Schobi at suespammers org

"And why should I know better by now/When I'm old enough not to?"
Beth Orton

 

[Stephen Alpert]

Do you really want to do this??
It creates a temporary unnamed 'ostrstream'
object and uses that to initialize 'pout'.

....[stuff deleted]...

I found that
ostrstream pout( res, n );
worked just fine. I guess VC6 wasn't so picky!

thanks!
/steveA

Steve Alpert
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