storing pointers to a templated class in a vector

I'm trying to create a boost::ptr_vector of a class with a templated member. I'm not sure of the correct way to do this, but what I've tried is below. With this code I get a compiler error which says:

Code:

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//GCC 4.3.2
error: type/value mismatch at argument 1 in template parameter list for ‘template<class T, class CloneAllocator, class Allocator> class boost::ptr_vector’

expected a type, got ‘Test’

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Is there some way to fix my implementation or, if this idea will not work, how would you suggest I do this?

Thanks for any help

Code:

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#include <iostream>
#include <string>
#include <boost/ptr_container/ptr_vector.hpp>

using namespace std;

template <typename T> class Test
{
    private:
        T var;

    public:
        explicit Test(const T &t) : var(t) {}
};

int main()
{
    boost::ptr_vector<Test> vec;
    vec.push_back(new Test<int>(123));
    vec.push_back(new Test<double>(1.23));
    vec.push_back(new Test<string>("test"));

    return 0;
}

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Test is a class template, so this line does not make sense as you are trying to store a pointer to Test:

Code:

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boost::ptr_vector<Test> vec;

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You would need to decide whether you want to store pointers to Test<int>, or Test<double>, or Test<string>.

Perhaps you should take a look at boost::any and boost::variant.

Thanks for the reply. I hadn't noticed boost::variant before; it does what I wanted.

you can store a pointer to a non-template base class from which the templates are derived.

But that opens up its own bag of worms, so watch out.