basics/card.hpp

The following code example is taken from the book
C++ Move Semantics - The Complete Guide by Nicolai M. Josuttis, Leanpub, 2020
The code is licensed under a Creative Commons Attribution 4.0 International License.

---

// raw code

#include <string>
#include <iostream>
#include <cassert>

void assertValidCard(const std::string& val)
{
  assert(val.find("seven") != std::string::npos ||
         val.find("eight") != std::string::npos ||
         val.find("nine") != std::string::npos ||
         val.find("ten") != std::string::npos ||
         val.find("jack") != std::string::npos ||
         val.find("queen") != std::string::npos ||
         val.find("king") != std::string::npos ||
         val.find("ace") != std::string::npos);
  assert(val.find("clubs") != std::string::npos ||
         val.find("spades") != std::string::npos ||
         val.find("hearts") != std::string::npos ||
         val.find("diamonds") != std::string::npos);
}

class Card {
private:
  std::string value;           // rank + "-of-" + suit
public:
  Card(const std::string& v)
   : value{v} {
      assertValidCard(value);  // ensure the value is always valid
  }
  //...

  std::string getValue() const {
    return value;
  }

  friend std::ostream& operator<< (std::ostream& strm, const Card& c) {
    return strm << c.value;
  }
};