Re: [Boost-users] boost::bind issues revisited

22 Apr 2013

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Date: Mon, 22 Apr 2013 00:52:27 -0600
From: tyler@tysdomain.com
To: boost-users@lists.boost.org
Subject: [Boost-users] boost::bind issues revisited
oHello all:
I'm kind of at a loss here. It looks like ther'es an issue with
boost::bind somewhere in the mess of 500 templates and 90 screens of
errors and I don't know enough about the mess to untangle it. Any info
would be awesome. First, the code:
sgroup->AddEntry(new OlcStringEntry("name", "Sets the name of the
object", OF_NORMAL,
boost::bind(&StaticObject::GetName, _1),
<159> boost::bind(&StaticObject::SetName, _1, _2)));
the 159 I denoted is useful in the errors later.
Now the rest of the code I'm using:
typedef boost::function<std::string ()> StringGetter;
typedef boost::function<void (const std::string&)> StringSetter;
class IOlcEntry
{
protected:
std::string _name;
std::string _help;
FLAG _flag;
public:
IOlcEntry(const std::string &name, const std::string &help, FLAG flag)
{
_flag = flag;
_name = name;
_help = help;
}
~IOlcEntry() {}
};
class OlcStringEntry:public IOlcEntry
{
protected:
StringGetter _getter;
StringSetter _setter;
public:
OlcStringEntry(const std::string &name, const std::string &help, FLAG
flag, const StringGetter getter, const StringSetter setter)
:IOlcEntry(name, help, flag)
{
_setter = setter;
_getter = getter;
}
};
Looks like you are trying to pass "boost::bind(&StaticObject::GetName, _1)",
which is a 1-argument function object, as the argument for a parameter of
type "StringGetter", which is a typedef for "boost::function<std::string ()>", 
which is a 0-argument function object. 

You have a similar problem for the setter.

Perhaps you meant to bind the getter and setter to a specific instance of
StaticObject? In that case, assuming 'my_instance' is that instance, you 
should write:

boost::bind(&StaticObject::GetName, my_instance)

and

boost::bind(&StaticObject::SetName, my_instance, _1)

and then you'll have function objects that are assignable to StringGetter
and StringSetter, respectively.

Regards,
Nate

Re: [Boost-users] boost::bind issues revisited

Nathan Ridge