CODEWITHSUNDEEP
c++templates
user1709708
user1709708

Reputation: 1577

How to customly convert template arguments

Lets say I parse a file and will get a string vector as a result which contains various data types. I'm now looking for a function like:

template<typename T>
T convertToType(const std::string& str);

which can do this conversion. Ideally I should be able to somehow provide my own conversion function, i.e. if T is an own complex type. Is there a way around having to pass it as a parameter everytime?

I was thinking about some sort of:

if(typeof(T) == double)
  std::stod(str)
// ...
else
  throw std::logical_error("Type not supported yet!");

Another option would be to write a template specialization for each type but this seems to make the use of a template function pretty useless if I have to specify it for each type again...

Upvotes: 1

Views: 56

Answers (1)

jxh
jxh

Reputation: 70392

This is turning Joachim's comment into an answer.

Use std::istringstream and let the input operator >> handle it.

std::istringstream iss(str);
T result;
if (!(iss >> result)) {
    throw std::logical_error("Type conversion failed!");
}
return result;

Upvotes: 1

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