Persist C++ type info to file for use across program invocations

Question

Edit: highlighting the actual question with more context available if desired.

I want to implement the following method:

template &l         


        

Answer 1

You can add code to define the persistent names of the types you wish to persist.

template <typename T> struct persistent_type;

template <> struct persistent_type<int>
{
   static std::string_view name() { return "int"; }
}

template <> struct persistent_type<double>
{
   static std::string_view name() { return "double"; }
}

etc.

And use them in make

template <typename T>
void make(std::string_view name, T value)
{
   // Save the type name of the data, persistent_type<T>::name()

   // Save the name of the data, name

   // Save the data, value
}

When getting the value, use

template <typename T>
T get(std::string_view name)
{
   // Read the type name and make sure it is equal to persistent_type<T>::name().

   // Rest of your logic to read the object
}