How can I specialize a template member function for std::vector

Question

I need to define a get method in two different ways. One for simple types T. And once for std::vector.

template
const T& Parameters::ge         


        

Answer 1

Erm. call it something else? e.g.

template
const T& Parameters::getVector(const std::string& key)
{
  Map::iterator i = params_.find(key);
  std::vector temp = boost::get >(i->second)
  // T is already a vector
  T ret; ret.reserve(temp.size());
  for(int i=0; i(temp[i]));
  }
  return ret;  
}

You'll have to call this as:

foo.getVector > ("some_key");

Nothing in your question precludes this.

Now, if you really do need to use get(), then you have to rely on partially specializing a structure, as function partial specialization is not supported by the language.

This is a lot more complicated, for example:

template 
struct getter
{
  const T& operator()(std::string const& key)
  {
    // default operations
  }
};

// Should double check this syntax 
template 
struct getter > >
{
  typedef std::vector > VecT;
  const VecT& operator()(std::string const& key)
  {
    // operations for vector
  }
};

Then in you method becomes:

template
const T& Parameters::get(const std::string& key)
{
  return getter()(key); // pass the structures getter needs?
}