Hello,
Can boost help me eliminate the ugly facade function I use below? I
have a boost::signals2::signal that passes an object ("CPerson").
I want to connect to this signal not to receive the object ("CPerson")
but to receive the result of one of its methods ("CPerson::GetAge()").
Can boost help me with this? If so I'm eager to read and learn about
it, I just need to know what it is called.
Thank you!
Chris
//===
#include
//----------
// A CPerson offers GetAge()
//----------
struct CPerson
{
int GetAge() const { return 0; }
};
//----------
// A CCompany has a boss and a signal
// to tell when boss is hired
//----------
struct CCompany
{
CPerson GetBoss() const { return mBoss; }
boost::signals2::signal BossHired;
CPerson mBoss;
};
//----------
// A CProcessor processes int ages.
// It does not know aobut CPerson
//----------
struct CProcessor
{
void f(int Age) {}
};
//----------
// ProcessorFacade is used to strip
// an age of a CPerson before
// passing the age to CProcessor
//----------
void ProcessorFacade(CProcessor& Processor, const CPerson& Person)
{
Processor.f(Person.GetAge());
}
//----------
// main puts it all together
//----------
int main()
{
CCompany Company;
CProcessor Processor;
// Compiler error: the signal sends an instance of CPerson,
// not the result of CPerson::GetAge(). Too bad because
// CProcessor does not have know about CPerson
//
// Company.BossHired.connect(
// boost::bind(&CProcessor::f, &Processor, _1));
// So we use an ugly facade instead
Company.BossHired.connect(
boost::bind(ProcessorFacade, boost::ref(Processor), _1));
return 0;
}
