Re: STL map containing pointer_to_binary_function
Glennmac@gmail.com wrote:
Thanks for the info.
Let me clearify my goal, I want a map to contain a string as the key
and a function pointer template as the data. Meaning, I want to insert
into the map the following things:
map["test"] = equal_to<string>; // or pointers to the
binary_function....
map["test1"] = equal_to<int>;
map["test2"] = less<double>;
etc...
I know the base template for all those functors is the binary_function
template.
Is it possible to have a map where the data is a binary_function
template?
use boost::any
#include <map>
#include <string>
#include <functional>
#include <algorithm>
#include <iostream>
#include <boost/any.hpp>
using namespace std;
using namespace boost;
struct FunctorDispatcher
{
void operator() (pair<string, boost::any> const& p) const {
if (p.first == "less<int>")
{
less<int> const* pFnct
= boost::any_cast<less<int> >(&(p.second));
if ((*pFnct)(1, 2))
cout << "true" << endl;
}
else if (p.first == "equal_to<string>")
{
equal_to<string> const* pFnct
= boost::any_cast<equal_to<std::string> >(&(p.second));
if ((*pFnct)("1", "1"))
cout << "true" << endl;
}
}
};
int main()
{
map<string, any> functorMap;
functorMap.insert(make_pair("less<int>", less<int>()));
functorMap.insert(make_pair("equal_to<string>", equal_to<string>()));
for_each(functorMap.begin(), functorMap.end(), FunctorDispatcher());
}
--
Thanks
Barry
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