fork download 
  1. // Copyright 2017 <Biagio Festa>
  2. #include <iostream>
  3. #include <string>
  4. #include <utility>
  5.  
  6. using DateType = int;
  7.  
  8. class DateOrString {
  9.  public:
  10.   explicit DateOrString(std::string str)
  11.       : m_is_a_string(true), m_string(std::move(str)) {}
  12.   explicit DateOrString(DateType date) : m_date(std::move(date)) {}
  13.  
  14.   const std::string& get_string() const {
  15.     if (m_is_a_string == false) {
  16.       throw std::runtime_error("It does not keep a string type");
  17.     }
  18.     return m_string;
  19.   }
  20.  
  21.   const DateType& get_date() const {
  22.     if (m_is_a_string == true) {
  23.       throw std::runtime_error("It does not keep a date type");
  24.     }
  25.     return m_date;
  26.   }
  27.  
  28.   bool is_string() const noexcept { return m_is_a_string; }
  29.  
  30.  private:
  31.   bool m_is_a_string = false;
  32.   DateType m_date;
  33.   std::string m_string;
  34. };
  35.  
  36. DateOrString api_call(const std::string& selector) {
  37.   if (selector.empty()) {
  38.     return DateOrString{"This is a string"};
  39.   }
  40.   return DateOrString{DateType{}};
  41. }
  42.  
  43. int main() {
  44.   auto r1 = api_call("");
  45.   auto r2 = api_call("s");
  46.  
  47.   std::cout << r1.get_string() << '\n';
  48.   std::cout << r2.get_date() << '\n';
  49.  
  50.   return 0;
  51. }
  52.  
Success #stdin #stdout 0s 15240KB
comments (?)
stdin 
Standard input is empty
stdout 
This is a string
0
https://ideone.com/gSBsEa
language:
C++14 (clang 8.0)
created:
7 years ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!