Re: How to initialise member variable in template construction

I am trying to set the strategy (algorithm) used in a context by
template. Here is my context class (which is incorrectly
implemented):
template<class TStrategy>
class Context //TStrategy is the algorithm
{
     private:
         TStrategy * strategy_; //knows about StrategyInterface

     public:
         void execute() const
         {
             strategy_->execute();
         }
};

The strategies:
class StrategyInterface
{
     public:
         virtual void execute() const = 0; //abstract class - interface
only
};

//the actual concrete algorithms
class ConcreteStrategyA: public StrategyInterface
{
     public:
         virtual void execute() const
         {
             cout<< "Called ConcreteStrategyA execute method"<< endl;
         }
};

And I want to do something like this:
Context<ConcreteStrategyA> contextD;
contextD.execute();

But I need to initialise the context data member properly. how do I
do that?