exception.h

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#ifndef SOPT_EXCEPTION
#define SOPT_EXCEPTION
 
#include "sopt/config.h"
#include <exception>
#include <sstream>
#include <string>
 
namespace sopt {
class Exception : public std::exception {
 protected:
  Exception(std::string const &name, std::string const &filename, size_t lineno)
      : std::exception(), message(header(name, filename, lineno)) {}
 
 public:
  Exception(std::string const &filename, size_t lineno)
      : Exception("sopt::Exception", filename, lineno) {}
 
  const char *what() const noexcept override { return message.c_str(); }
 
  static std::string header(std::string const &name, std::string const &filename, size_t lineno) {
    std::ostringstream header;
    header << name << " at " << filename << ":" << lineno;
    return header.str();
  }
 
  template <typename OBJECT>
  Exception &operator<<(OBJECT const &object) {
    std::ostringstream msg;
    msg << message << object;
    message = msg.str();
    return *this;
  }
 
 private:
  std::string message;
};
 
#define SOPT_THROW(MSG) throw(sopt::Exception(__FILE__, __LINE__) << "\n" << MSG)
 
}  // namespace sopt
#endif