Choose template based on run-time string in C++

Question

I have an attribute vector that can hold different types:

class base_attribute_vector; // no template args

template
class raw_attribute_ve         


        

Answer 1

I'd use an std::map that has strings as key and std::function as values. I would associate the string with a function that returns your type. Here's an example:

using functionType = std::function()>;
std::map theMap;

theMap.emplace("int", []{ return new raw_attribute_vector; });
theMap.emplace("float", []{ return new raw_attribute_vector; });

// Using the map
auto base_vec = theMap["int"](); // base_vec is an instance of raw_attribute_vector

Of course, this solution is valid if you only know the string value at runtime.