read_only.h

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#ifndef READ_ONLY_H
#define READ_ONLY_H
 
#include <vector>
#include <stdexcept>
 
template <class T>
class read_only
{
public:
  read_only() : m_value{std::vector<T>()} {};
  read_only(const T& value) : m_value{std::vector<T>(1, value)} {};
 
  bool has_value() const { return !m_value.empty(); };
 
  const T& get_value() const {
    if(!this->has_value())
      {
        throw std::logic_error("this object does not contain a value!\n");
      }
    return m_value[0];
  };
 
  void operator=( const T& value ) { m_value[0] = value; };
 
private:
  std::vector<T> m_value;
};
 
void test_read_only();
 
#endif // READ_ONLY_H