Named Value Implementation in C++ Using Templates

named-type.h

// --------------------------------------------------------------------------------------------------------------------
//
// Author:        Jose Fernando Lopez
// Date:          6-November-2018
//
// Description:   This is a sample of how a named value might be implemented using a templated class in C++.
//                I will update the constructor with proper move-semantics, add a copy constructor, etc., as
//                well as add in string_view usage. I also need to add in operators in order for the value
//                to be actually used.
//
// Sample Usage:  
//
// int main()
// {
//    NamedValue<int> age{ "Age", 25 };
//
//    std::cout << age;
// }
//
// Output:
//  Age: 25
//
// --------------------------------------------------------------------------------------------------------------------

#ifndef PROJECT_NAME_NAMED_TYPE_H_INCLUDED
#define PROJECT_NAME_NAMED_TYPE_H_INCLUDED

#include <iostream>
#include <string>

template <typename T>
class NamedValue
{
  std::string Name;
  
  T value;
  
public:
  
  NamedValue() = delete;
  
  NamedValue(char const *, char const *) -> NamedValue<std::string>;
  
  NamedValue(std::string name, T val)
    : name{ name }, value{ val }
  { }
  
  auto Name() const noexcept { return name; }
  
  auto Value() const noexcept { return value; }
  
  template <typename U>
  friend std::ostream&
  operator << (std::ostream& outputStream, const NamedValue<U>& namedValue)
  {
    return outputStream << namedValue.Name() << ": " << namedValue.Value() << '\n';
  }
};

#endif // PROJECT_NAME_NAMED_TYPE_H_INCLUDED