// cmpt_error.h

// By defining CMPT_ERROR_H, we avoid problems caused by including 
// this file more than once: if CMPT_ERROR_H is already defined, then 
// the code is *not* included.
#ifndef CMPT_ERROR_H
#define CMPT_ERROR_H

#include <string>
#include <stdexcept>

// C++ already has function called error, and so we put our error 
// function inside a namespace called cmpt. Thus, to use this error 
// function, we will write its full name, cmpt::error.
namespace cmpt {

// runtime_error is a pre-defined C++ object meant to be "thrown" when 
// an error occurs while a program is running. When it is thrown, the 
// program will end and print the given error message.
inline void error(const std::string& message)
{
    throw std::runtime_error(message);
}

} // namespace cmpt

#endif