I have a CSkill class which is rather complex as it is recursive. That is:
class CSkill
{
public:
CSkill( std::string Name, float Value ): Name_( Name ), Value_( Value )
{};
void Update( const std::string& Name, const float Value );
float Value( const std::string& Name ) const;
float Sum( const std::string& Name ) const;
void Write( std::ostream& os, const std::string& Prefix ) const;
std::string CSkill::PlainNa me( const std::string& Name ) const;
friend std::istream& operator>>( std::istream& is, CSkill& Skill);
private:
float Sum() const;
std::string Name_;
float Value_;
std::map< std::string, CSkill > Skills_;
};
Well, to output this class to an ostream, I use this function:
void CSkill::Write( std::ostream& os, const std::string& Prefix ) const
{
if ( Name_.length() > 0 && Value_ > 0 )
os << Prefix << Name_ << " " << Value_ << std::endl;
for ( std::map< std::string, CSkill >::const_iterat or it =
Skills_.begin() ; it != Skills_.end(); ++it )
{
(*it).second.Wr ite( os, ( Name_.length() > 0 ? Prefix + Name_ + "|"
: "" ) );
}
}
but I would prefer to use
std::ostream& operator<<( /* what goes here? */ )
The problem I see is that I need to pass that extra parameter, a
std::string, which is used in the recursion. Is something like this
allowed?
outfile << Skills( "" ) << SomethingElse
I don't think so because a "normal" declaration of the operator<< would be
something like:
std::ostream& operator<<( std::ostream& os, CCharacter& CChar)
and so I would have to make it something like:
std::ostream& operator<<( std::ostream& os, const CSkill& Skill, const
std::string& Prefix )
But the compiler complains (no suprise):
error C2804: binary 'operator <<' has too many parameters
Any suggestions or do I just have to stick with the way I'm doing it? 3 1843
Jim Langston <ta*******@rock etmail.com> wrote: I have a CSkill class which is rather complex as it is recursive. That is:
class CSkill { public: CSkill( std::string Name, float Value ): Name_( Name ), Value_( Value ) {}; void Update( const std::string& Name, const float Value ); float Value( const std::string& Name ) const; float Sum( const std::string& Name ) const; void Write( std::ostream& os, const std::string& Prefix ) const;
std::string CSkill::PlainNa me( const std::string& Name ) const;
friend std::istream& operator>>( std::istream& is, CSkill& Skill);
private: float Sum() const;
std::string Name_; float Value_; std::map< std::string, CSkill > Skills_;
};
Well, to output this class to an ostream, I use this function:
void CSkill::Write( std::ostream& os, const std::string& Prefix ) const { if ( Name_.length() > 0 && Value_ > 0 ) os << Prefix << Name_ << " " << Value_ << std::endl; for ( std::map< std::string, CSkill >::const_iterat or it = Skills_.begin() ; it != Skills_.end(); ++it ) { (*it).second.Wr ite( os, ( Name_.length() > 0 ? Prefix + Name_ + "|" : "" ) ); } }
but I would prefer to use std::ostream& operator<<( /* what goes here? */ )
The problem I see is that I need to pass that extra parameter, a std::string, which is used in the recursion. Is something like this allowed? outfile << Skills( "" ) << SomethingElse
Could you do something like:
std::ostream& operator<<(std: :ostream& o, const CSkill& c)
{
c.Write(o, "");
return o;
}
?
--
Marcus Kwok
Replace 'invalid' with 'net' to reply
Jim Langston wrote: I have a CSkill class which is rather complex as it is recursive. That is:
[snip (a rather lengthy class declaration)] Well, to output this class to an ostream, I use this function:
void CSkill::Write( std::ostream& os, const std::string& Prefix ) const {
[snip (we don't care)]
}
but I would prefer to use std::ostream& operator<<( /* what goes here? */ )
The problem I see is that I need to pass that extra parameter, a std::string, which is used in the recursion. Is something like this allowed? outfile << Skills( "" ) << SomethingElse
If you like so. One way would be add operator () to CSkill like this:
class CSkill
{
private:
std::string m_pAdditionalPa rameter;
public:
CSkill& operator () (const std::string& p_pAdditionalPa rameter)
{
m_pAdditionalPa rameter = p_pAdditionalPa rameter;
return *this;
}
// Now the rest of your class.
};
The operator<< will now look like this:
std::ostream& operator<< (std::ostream& os, CSkill& p_Skill)
{
p_Skill.Write (os, m_pAdditionalPa rameter);
return os;
}
Regards,
Stuart
"Marcus Kwok" <ri******@gehen nom.invalid> wrote in message
news:e4******** **@news-int.gatech.edu. .. Jim Langston <ta*******@rock etmail.com> wrote: I have a CSkill class which is rather complex as it is recursive. That is:
class CSkill { public: CSkill( std::string Name, float Value ): Name_( Name ), Value_( Value ) {}; void Update( const std::string& Name, const float Value ); float Value( const std::string& Name ) const; float Sum( const std::string& Name ) const; void Write( std::ostream& os, const std::string& Prefix ) const;
std::string CSkill::PlainNa me( const std::string& Name ) const;
friend std::istream& operator>>( std::istream& is, CSkill& Skill);
private: float Sum() const;
std::string Name_; float Value_; std::map< std::string, CSkill > Skills_;
};
Well, to output this class to an ostream, I use this function:
void CSkill::Write( std::ostream& os, const std::string& Prefix ) const { if ( Name_.length() > 0 && Value_ > 0 ) os << Prefix << Name_ << " " << Value_ << std::endl; for ( std::map< std::string, CSkill >::const_iterat or it = Skills_.begin() ; it != Skills_.end(); ++it ) { (*it).second.Wr ite( os, ( Name_.length() > 0 ? Prefix + Name_ + "|" : "" ) ); } }
but I would prefer to use std::ostream& operator<<( /* what goes here? */ )
The problem I see is that I need to pass that extra parameter, a std::string, which is used in the recursion. Is something like this allowed? outfile << Skills( "" ) << SomethingElse
Could you do something like:
std::ostream& operator<<(std: :ostream& o, const CSkill& c) { c.Write(o, ""); return o; }
?
I actually thought about that about 2 minutes before checking for responses.
That's a good idea and I think that's the way I'll go. The parm going into
the top level is an empty string "" so I don't have to change it.
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