Alan M. Carroll wrote:
1) find_if expects a unary functor returning bool. You are passing a binary functor. _1 will be the element in the vector, but what did you think would be passed for _2?
2) CompareByVal should either be static or not have the pointer argument. There's no need to pass "this" by hand. The first argument to the bind of a method is an explicit "this" but the method is just a method, it is not aware that it has been called from Boost.bind.
Or, expressed in code, this is what you might want:
-----------------------------------------------------------
#include <algorithm>
#include <string>
#include <vector>
#include
#include <algorithm>
#include <string>
#include <vector>
#include
template<typename T> class A
{
T _val;
public:
A(T val) : _val(val){};
T Val() {return _val;}
const bool CompareByVal(const int iType, const T& ofval) const
{
return ((iType == 1) && (_val == ofval));
}
};
int main(int argc, char** argv) // My compiler did not like _TCHAR
{
std::vector a;
std::find_if (a.begin(),
a.end(),
boost::bind(&A<int>::CompareByVal, _1, 1, 2));
}
---------------------------------------------
This finds those A objects with _val==2 under the condition that iType==1.
Btw, with _val being of type int* in the original example, I would
consider any found instances pretty dubious ;-)
Regards,
Roland
