Hello,
In the code below, the last function, "GetFunctionThatReturnsRefX_2",
does not compile. It is attempting to use boost::bind to produce a
boost::function that takes a pointer to an object and returns one of
the object's member variables by reference.
If it is possible, would you modify it so that it does compile?
Note 1: No problem when returning a copy as in "GetFunctionThatReturnsCopyX_2"
Note 2: I employ a workaround in "GetFunctionThatReturnsRefX_1" that
uses a helper "facade" function. I'm hoping to avoid this. Similarly
I'm hoping to not have to add member function TCObject::GetX.
Invoked with "g++ -c test.cpp" using gcc 4.6.3.
Thank you,
Chris
#include
#include
//------------------------------------
//------------------------------------
struct TCObject
{
int x;
};
//------------------------------------
//------------------------------------
int GetCopyX(TCObject* pClass)
{
return pClass->x;
}
//------------------------------------
//------------------------------------
boost::function GetFunctionThatReturnsCopyX_1()
{
return boost::bind(GetCopyX, _1);
}
//------------------------------------
//------------------------------------
boost::function GetFunctionThatReturnsCopyX_2()
{
return boost::bind(&TCObject::x, _1);
}
//------------------------------------
//------------------------------------
int& GetRefX(TCObject* pClass)
{
return pClass->x;
}
//------------------------------------
//------------------------------------
boost::function GetFunctionThatReturnsRefX_1()
{
return boost::bind(GetRefX, _1);
}
//------------------------------------
//------------------------------------
boost::function GetFunctionThatReturnsRefX_2()
{
//return boost::ref(boost::bind(&TCObject::x, _1));
return boost::bind(&TCObject::x, _1);
}
